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Type: Prelims Only

  • HC Observations over Right to Change Name

    Central Idea

    • Allahabad High Court has allowed a man to change his name citing fundamental rights under Articles 19(1) (a), 21, and 14.
    • Delhi High Court permitted two brothers to reflect their father’s changed surname on their Board certificates, asserting the right to identity as an intrinsic part of the right to life under Article 21.
    Article Summary
    Article 19(1)(a) Freedom of speech and expression: Citizens have the right to express their opinions and ideas freely, with reasonable restrictions to safeguard national interests and public order.
    Article 21 Right to life and personal liberty: Individuals are protected from arbitrary deprivation of life or liberty and have the right to live with dignity. It includes the right to privacy and encompasses various aspects of human rights.
    Article 14 Right to equality: All individuals are entitled to equal protection under the law, ensuring fairness and prohibiting discrimination based on religion, race, caste, sex, or place of birth. It promotes equality before the law for all citizens.

    Right to Change Name

    • The right to change one’s name is recognized as a fundamental right under Article 21 of the Constitution, which guarantees the right to life and personal liberty.
    • It is often exercised for various reasons, including personal preferences, religious conversions, marriage or divorce, or to overcome social or cultural barriers.
    • Individuals may choose to change their names to reflect their gender identity, religious beliefs, or to align with their professional or artistic pursuits.

    Process to change the name

    1. Prepare a petition stating the desire to change the name and reasons for the change.
    2. Prepare an affidavit affirming the intention to change the name and get it notarized.
    3. Publish a notice in two local newspapers announcing the name change.
    4. Apply for Gazette notification through the Department of Publication.
    5. Gather supporting documents like identity and address proof.
    6. File the petition, affidavit, and supporting documents in the appropriate court.
    7. Attend the court hearing and provide necessary explanations.
    8. Obtain a court order approving the name change.
    9. Update official documents with the new name.

    Observations by the HCs

    • Allahabad High Court ruled that the rejection of the name-change applications by the authorities violates fundamental rights guaranteed under Articles 19(1)(a), 21, and 14.
    • It emphasized the need for congruence in all identity-related documents and the prevention of confusion and potential misuse.
    • Delhi High Court asserted the right to identity as an intrinsic part of the right to life under Article 21.

    Restrictions on the Right to Change Names

    • Although the right to change names is a fundamental right, it is subject to reasonable restrictions.
    • Restrictions imposed by law must be fair, just, and reasonable.
    • Principle of proportionality and the value of human dignity play important roles in determining the reasonableness of restrictions (Jeeja Ghosh vs. Union of India, 2016).

     

  • National Pension Scheme (NPS)

    pension

    Central Idea

    • The Pension Fund Regulatory and Development Authority (PFRDA) has introduced a new feature for systematic withdrawal from the National Pension Scheme (NPS).

    National Pension Scheme (NPS): A Brief Overview

    • The National Pension Scheme (NPS) is a voluntary retirement savings scheme launched by the Government of India in 2004.
    • It is regulated and administered by the Pension Fund Regulatory and Development Authority (PFRDA).
    • The primary objective of the NPS is to provide a pension income to individuals upon their retirement.

    Key Features of the NPS:

    • Contributions: Subscribers make regular contributions to their NPS account during their working years. These contributions accumulate and grow over time.
    • Investment Options: The NPS offers two investment options: a) Auto Choice: where the funds are invested based on the subscriber’s age, and b) Active Choice: where the subscriber can select the asset classes (equity, corporate bonds, and government securities) and the fund manager.
    • Portable Account: The NPS account is portable, allowing subscribers to maintain their account even if they change jobs or locations.
    • Withdrawal Options: Upon retirement, subscribers have the flexibility to withdraw a portion of their accumulated corpus as a lump sum and use the remaining amount to purchase an annuity, which provides a regular pension income.
    • Tax Benefits: NPS offers tax benefits at different stages. Contributions made by subscribers are eligible for tax deductions under Section 80C, while withdrawals are subject to certain tax exemptions.
    • Regulated and Transparent: The NPS is regulated by the PFRDA, ensuring transparency and oversight of the scheme. It follows strict investment guidelines and has mechanisms in place to safeguard the interests of subscribers.
    • Wide Coverage: The NPS is available to all Indian citizens, including salaried employees, self-employed individuals, and non-resident Indians (NRIs).

    Benefits of the NPS

    • Retirement Income: The NPS provides a retirement income to subscribers, ensuring financial security during their post-retirement years.
    • Long-term Wealth Creation: The investment component of the NPS allows subscribers to accumulate wealth over time, potentially generating higher returns and building a substantial retirement corpus.
    • Flexibility and Control: Subscribers have the flexibility to choose their investment options and actively manage their NPS accounts, providing a level of control over their retirement savings.
    • Tax Efficiency: The NPS offers tax benefits both on contributions and withdrawals, making it a tax-efficient retirement savings option.
    • Portability: The portability feature of the NPS allows subscribers to continue their account irrespective of job changes or relocations.
    • Regulated and Secure: The NPS is regulated by the PFRDA, ensuring a secure and transparent framework for retirement savings.

    Changes introduced: Systematic Withdrawal Plan

    • NPS subscribers will be allowed to withdraw 60% of their contributions systematically post-retirement.
    • The current system of one-time withdrawal will be replaced.
    • 40% of the contributions must be in annuity.
    • Systematic withdrawals can be customized by the subscriber based on their needs.
    • Withdrawals can be made in lump sum or on a monthly, quarterly, half-yearly, or annual basis.
    • This feature is applicable to individuals aged 60-75.

    Benefits offered by this change

    • Flexibility: Subscribers can customize their withdrawals based on their financial needs.
    • Regular Income: Systematic withdrawals provide a regular income stream post-retirement.
    • Enhanced Financial Planning: Allows for better financial planning and management.

     

  • In news: Prime Ministers Museum and Library Society

    Central Idea

    • The decision to rename the Nehru Memorial Museum and Library (NMML) Society has ignited a political controversy.
    • The institution will now be known as the ‘Prime Ministers Museum and Library Society’.
    • The controversy reflects the ongoing debate surrounding dynastic politics in India.

    About the Nehru Memorial Museum and Library (NMML) (erstwhile)

    • NMML in New Delhi, is an autonomous institution under the Ministry of Culture.
    • It is a leading resource center on India’s first Prime Minister, Jawaharlal Nehru.
    • Established in 1964, it houses extensive archives, including Mahatma Gandhi’s writings and private papers of prominent figures like Swami Sahajanand Saraswati, C. Rajagopalachari, and Sarojini Naidu.
    • It is located in the majestic Teen Murti House, the official residence of the first Prime Minister of India.
    • It has four major constituents, namely, a Memorial Museum, a library on modern India, a Centre for Contemporary Studies and the Nehru Planetarium.

    Pradhanmantri Sangrahalaya (the PM’s Museum)

    • In April 2022, the NMML inaugurated the Museum as a new addition to the institution.
    • It is a tribute to every Prime Minister of India since Independence, showcasing their contributions to the nation’s development over the past 75 years.

    Why rename it now?

    • The meeting acknowledged the contributions of all past and present Prime Ministers and expressed the mission of the Society to preserve India’s democratic journey and legacy.
    • It was felt that renaming the institution would better align with this purpose.
  • Kari Ishad Mango from Karnataka gets GI tag

    mango

    Central Idea

    • The Kari Ishad mango, prominently grown in Ankola taluk of Uttara Kannada, has been awarded the Geographical Indication (GI) tag by the Geographical Indications Registry.
    • The GI certificate has been issued to Matha Totagars Farmer Producer Company Limited, Ankola, and is valid until March 1, 2032 from March 31, 2023.

    Kari Ishad Mango

    • The Kari Ishad mango is renowned for its unique aroma, luscious taste, high amount of pulp, and distinctive shape and size.
    • They are large and have an oblique to oval shape.
    • Typically, each panicle bears only one fruit, and a well-grown tree can produce up to 2,000 fruits in a season.
    • However, the fruit has a short shelf life of about five days.

    Cultivation and Production

    • Apart from Ankola, the Kari Ishad mango is grown in Karwar and to a certain extent in Kumta of Uttara Kannada.
    • The prominent cultivation areas include Belse, Shetgeri, Belambara, Mogata, and Vandige villages of Ankola.
    • Vandige village stands out as the highest producer, yielding around 600 tonnes of fruits per season. Belse village boasts 1,500 plants.

    Variants of the Mango

    • The Ishad mango has two variants:
    1. Kari Ishad, characterized by its thin skin, abundance of pulp, and sweetness,
    2. Bili Ishad, which has thick skin, less pulp, and sweetness.

    Back2Basics: Geographical Indication (GI)

    • A GI is a sign used on products that have a specific geographical origin and possess qualities or a reputation that are due to that origin.
    • Nodal Agency: Department for Promotion of Industry and Internal Trade (DPIIT), Ministry of Commerce and Industry
    • India, as a member of the World Trade Organization (WTO), enacted the Geographical Indications of Goods (Registration and Protection) Act, 1999 w.e.f. September 2003.
    • GIs have been defined under Article 22 (1) of the WTO Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS) Agreement.
    • The tag stands valid for 10 years.
  • Controversial Species Names in Taxonomy

    taxonomy species name

    Central Idea

    • The field of taxonomy, which involves naming and classifying living beings, is currently engaged in a heated discussion regarding the renaming of species with objectionable scientific names.
    • These names often stem from problematic individuals associated with slavery, racism, derogatory terms, and racial slurs.
    • The debate has gained prominence in recent years, particularly in the wake of movements like Black Lives Matter, which seeks to address systemic racism and dismantle symbols of oppression.

    Controversial Naming Practices

    (1) Species Named after Controversial Figures:

    • Anophthalmus hitleri: The blind beetle named after Adolf Hitler by an entomologist who admired him gained popularity among Neo-Nazis, leading to its near-extinction.
    • Uta stansburiana: The lizard named after Howard Stansbury, known for his involvement in the massacre of Timpanogos Native Americans.
    • Hibbertia scandens: The plant named after George Hibbert, a prominent member of the pro-slavery and anti-abolition lobby.

    (2) Species Named with Derogatory Terms:

    • Hottentotta tamulus scorpion: The use of “Hottentot” as a derogatory term for Indigenous Black people in Africa.
    • Rauvolfia caffra: The quinine tree named with an offensive term considered hate speech against Black communities in South Africa.

    Rules and International Bodies

    • Nomenclature Codes: International bodies such as ICZN, ICNafp, ICNB, and ICTV govern the naming of animals, plants, bacteria, and viruses, respectively.
    • Validity and Publication: New names must be published in openly distributed publications and accompanied by detailed descriptions of typical specimens.
    ICZN: International Commission of Zoological Nomenclature

    ICNafp: International Code of Nomenclature for algae, fungi, and plants

    ICNB: International Code of Nomenclature of Bacteria

    ICTV: International Committee on Taxonomy of Viruses

    Scientific Naming Process

    • Two-part Scientific Names: Each species has two scientific names, with the first denoting the genus and the second identifying the species within the genus. Both names are italicized.
    • Naming Conventions: Names are often derived from Latin or Greek, reflecting distinctive features or characteristics of the species.

    Challenges in Changing Offensive Names

    • Limited Appetite for Change: International committees show little inclination to engage in debates on potentially offensive names, prioritizing stability and universality.
    • Criteria for Name Change: The rules state that name changes should only occur with profound taxonomic knowledge or to rectify names conflicting with established rules.
  • Festivals in news: Pandharpur Wari

    Pandharpur Wari

    The Sant Tukaram and Sant Dyaneshwar Palkhi processions started their three-week-long journeys from the temple towns of Dehu and Alandi in Pune.

    Pandharpur Wari

    Pandharpur wari
    The deities are said to be shifted to Pandharpur right away from Vitthala Temple, Hampi (Karnataka) to avoid demolition.
    • Tradition: The Wari tradition is an 800-year-old pilgrimage in Maharashtra, where devotees, known as Warkaris, undertake a foot journey to the Vithoba temple (Incarnation of Vishnu) in Pandharpur.
    • Largest walking event: The event is said to be one of the world’s largest and oldest movements where people gather on one day each year and walk a distance of around 250 km.
    • Guinness Record: The Wari has been classified by the World Book of Records as “one of the most visited places in a day”
    • Essence of Wakari Panth: The Wari is a ritualistic practice and a distinctive part of Maharashtrian culture, representing the essence of the Wakari Panth, which is a sect within the Bhakti tradition.
    • Four Processions: The Wari takes place in four months – Chaitra, Ashadh, Kartik, and Magh. The Ashadhi Ekadashi Wari is the most popular and significant among these processions.

    Historical Evolution

    • Changed over time: Over the years, the Wari procession has evolved with changing practices, associated legends, and unique systems of organization and management.
    • Influence of Sant Dyaneshwar: The Wari tradition can be traced back to Sant Dyaneshwar, the father of Sant Dyaneshwar, who played a pivotal role in promoting the pilgrimage to Pandharpur.
    • Legacy of Sant Namdev: Sant Namdev (whose verses find mention in Guru Granth Sahib), a contemporary of Sant Dyaneshwar, also followed the tradition and composed devotional compositions expressing his devotion to Lord Vitthala.

    Rituals and Cultural Aspects

    • Dindi and Musical Fervor: Dindis, comprising groups of devotees, accompany the palkis during the Wari, singing, chanting, and dancing. Musical instruments like the veena and mridangam enhance the devotional fervor.
    • Seva Dindis and Social Initiatives: Seva Dindis perform selfless service along the Wari route, including annadana (donation of food), medical assistance, and rural infrastructure development.
    • Social Messaging and Initiatives: The Wari has been utilized as a platform for social messaging and initiatives such as promoting cleanliness through the ‘Nirmal Wari’ campaign and women-centric drives like ‘Wari Nari Shakti’ focusing on menstrual hygiene.

    Try this PYQ:

    Consider the following pairs:

    Traditions Communities

    1. Chaliha Sahib Festival — Sindhis
    2. Nanda Raj Jaat Yatra — Gonds
    3. Wari-Warkari — Santhals

    Which of the pairs given above is/are correctly matched?

    (a) 1 only

    (b) 2 and 3

    (c) 1 and 3

    (d) None of the above

     

    [wpdiscuz-feedback id=”uwlqiz3dsn” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

     

  • What is El Nino and How it impacts the Monsoon?

    el nino

    Central Idea

    • Delay in Monsoon: Any discussion on Indian monsoon delay these days invariably has references to the El Nino phenomenon.
    • Sudden rise of El Nino: This year’s monsoon is also progressing under the cloud of an El Nino in the Pacific Ocean.

    Understanding El Nino and La Nina

    • El Nino and La Nina are two opposite phases of the El Nino-Southern Oscillation (ENSO) cycle.
    • ENSO is a naturally occurring phenomenon that involves the interaction between the ocean and atmosphere in the equatorial Pacific.

    Here is a detailed comparison of El Nino and La Nina

    El Nino La Nina
    Definition Warmer-than-normal sea surface temperatures Cooler-than-normal sea surface temperatures
    Frequency Every two to seven years Every two to seven years
    Duration Several months to a year or more Several months to a year or more
    Impact on winds Weakens trade winds, leading to changes in patterns Strengthens trade winds, leading to changes in patterns
    Impact on rains Reduces rainfall and can cause droughts Increases rainfall and can cause flooding
    Impact on temp. Warmer-than-average temperatures Colder-than-average temperatures
    Global effects Droughts in Asia and Africa, floods in Americas Floods in Asia and Africa, droughts in South America

     

    Impact on India

    El Nino La Nina
    Associated with weak monsoons and drought-like conditions in India Associated with above-normal rainfall and floods in India
    Sea surface temperature in the equatorial Pacific Ocean rises above normal levels Sea surface temperature in the equatorial Pacific Ocean drops below normal levels
    Changes in the atmospheric circulation patterns Changes in the atmospheric circulation patterns
    Shift in the location of the jet stream, affecting the strength and direction of the monsoon winds Increase in the strength of the monsoon winds, bringing more moisture and rainfall to India
    Results in reduced rainfall, dry spells, and heatwaves, leading to crop failures and water scarcity Excessive rainfall can also lead to floods and landslides, causing damage to crops and infrastructure

     

    El Nino and Indian Monsoon

    • El Nino and its impact on Indian monsoon: El Nino refers to abnormal warming of surface waters in the equatorial Pacific Ocean, which tends to suppress monsoon rainfall in India.
    • Phases of El Nino Southern Oscillation (ENSO): ENSO consists of three phases in the Pacific Ocean: El Nino, La Nina (abnormal cooling), and a neutral phase with sea surface temperatures close to long-term averages.
    • Ocean and atmospheric conditions: ENSO involves not only temperature abnormalities of sea surface waters but also atmospheric conditions, including differences in sea-level air pressure and wind strength and direction.
    • Southern oscillation and the role of winds: Southern Oscillation Index measures the difference in sea-level air pressure over the western and eastern sides of the Pacific Ocean, while wind patterns play a crucial role in ENSO.

    Factors triggering El Nino

    • Weakening trade winds: When the trade winds in the tropical Pacific weaken, it contributes to the occurrence of El Nino by reducing the movement of warm surface waters.
    • Changes in ocean currents: Alterations in the normal patterns of ocean currents can trigger El Nino events as they affect the distribution and accumulation of warm water in the central and eastern Pacific.
    • Variations in atmospheric pressure: Fluctuations in atmospheric pressure patterns disrupt the typical circulation associated with trade winds, which can initiate the onset of El Nino conditions.
    • Influence of oceanic Kelvin waves: The presence and behavior of oceanic Kelvin waves, large-scale waves that transport warm water eastward, play a role in the development and intensification of El Nino events.
    • Interactions with other climate modes: El Nino can be influenced by the interactions and connections with other climate phenomena such as the Indian Ocean Dipole and the Madden-Julian Oscillation, which can impact the oceanic and atmospheric conditions in the Pacific region.

    Measuring the Cycle

    (1) Oceanic Nino Index (ONI)

    • Measures the oceanic component of El Nino Southern Oscillation (ENSO).
    • Tracks the departure from average sea surface temperatures in the tropical Pacific Ocean.
    • Helps quantify the intensity and duration of El Nino or La Nina events.
    • Typically based on a rolling three-month average of sea surface temperature anomalies in specific regions.

    (2) Southern Oscillation Index (SOI)

    • Measures the atmospheric component of ENSO.
    • Quantifies the difference in air pressure between two locations: Tahiti and Darwin.
    • Positive SOI values indicate higher pressure in the eastern Pacific and lower pressure in the western Pacific.
    • Negative SOI values indicate lower pressure in the eastern Pacific and higher pressure in the western Pacific.
    • Reflects the strength and changes in the atmospheric circulation patterns associated with ENSO.
    • Used to assess the phase and strength of ENSO and its impact on global weather and climate patterns.

    Economic impact of El Nino on Indian Agriculture

    • Drought and reduced rainfall: El Nino events often lead to below-average monsoon rainfall in India, resulting in drought conditions in various regions.
    • Crop failure and lower yields: Lack of adequate water availability can lead to crop failure or lower yields for major crops such as rice, wheat, pulses, and oilseeds.
    • Increased input costs: During El Nino-induced droughts, farmers may need to invest in additional irrigation, water management, and supplementary feeding for livestock, leading to increased input costs.
    • Price fluctuations: Reduced crop production due to El Nino can affect market supply, leading to price fluctuations and potential inflation in food prices.
    • Livestock and fisheries: Water scarcity and changes in marine ecosystems can negatively affect animal husbandry and fishing activities, disrupting the livelihoods of those dependent on these sectors.
    • Rural livelihoods and migration: The economic stress created can impact rural livelihoods, leading to increased migration from rural to urban areas in search of alternative employment opportunities.

    Try this PYQ:

    La Nina is suspected to have caused recent floods in Australia. How is La Nina different from El Nino?

    1. La Nina is characterized by unusually cold ocean temperature in equatorial Indian Ocean whereas El Nino is characterized by unusually warm ocean temperature in the equatorial Pacific Ocean.
    2. El Nino has an adverse effect on south-west monsoon of India, but La Nina has no effect on monsoon climate.

    Which of the statements given above is/are correct?

    (a) Only 1

    (b) Only 2

    (c) Both 1 and 2

    (d) Neither 1 nor 2

     

    [wpdiscuz-feedback id=”2c11bi6xlo” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

  • Subansiri Lower Hydroelectric Project (SLHEP)

    subansiri

    Central Idea

    • Trial runs for the Subansiri Lower Hydroelectric Project (SLHEP): NHPC Limited, a government of India enterprise, will begin trial runs for the Project in July.
    • India’s largest: After a delay of 20 years, India is finally approaching the launch of India’s largest hydropower project which is crucial for the region’s energy transition.
    • About NHPC Ltd: NHPC Limited, formerly known as National Hydroelectric Power Corporation Ltd, is the largest hydropower development organization in India.

    About Subansiri Lower Hydroelectric Project (SLHEP)

    • Gravity dam: It is a concrete gravity dam 116 m high from river bed level on the Subansiri River.
    • Location: The dam is located approximately 2.3 km upstream of the Subansiri River in Arunachal Pradesh, India.
    • Accessibility: The project is located near North Lakhimpur on the border of Arunachal Pradesh and Assam. The nearest railhead is Nagaon, and the nearest airport is Lilabari/Dibrugarh.
    • Run-of-the-river project: NHPC Limited, the project developer, describes the SLHEP as a run-of-the-river project, indicating its design aims to maintain the natural flow of the river.
    • Power generation capacity: Once completed, the SLHEP is expected to have a power generation capacity of 2,000 MW, making it one of the largest hydroelectric projects in India.

    Construction challenges

    • Natural obstacles: The project has faced several challenges during its construction, including issues related to landslides, the need for redesigning certain aspects, and opposition from various stakeholders.
    • Delayed completion: Originally scheduled for completion in 2018, the project has experienced delays, contributing to its ongoing construction status.
    • Clearance from NGT: The SLHEP received clearance from the National Green Tribunal (NGT) on July 31, 2019, allowing for the resumption of main dam construction activities on October 15, 2019.
    • Construction progress: As of early 2019, work on the SLHEP and other major dam projects in the Assam region, such as the Dibang Dam, had faced challenges and were not progressing as expected.

    Benefits offered

    • Cascade development and flood moderation: It is expected to moderate floods in the Subansiri River and bring overall development to the area, benefiting the local economy.
    • Hydropower boost: Hydropower plays a crucial role in balancing the electricity grid, especially as solar and wind power generation rise.

    Strategic Location

    • Its strategic significance is heightened by its proximity to the India-China border.
    • Located in Arunachal Pradesh, which shares a border with China, the project holds geopolitical importance.

     

  • Betelgeuse: The Red Giant Star on the Brink of Supernova

    Betelgeuse

    Central Idea: Recent research has shed light on the Betelgeuse’s current stage and its potential fate as it approaches the end of its lifecycle.

    Betelgeuse: The Bright Red Star in Orion

    • Easily visible in the constellation Orion, Betelgeuse is a bright red star known as “Thiruvathirai” or “Ardra” in Indian astronomy.
    • It is a massive star that undergoes the carbon-burning stage, leading to its eventual collapse into a supernova.

    How is it dying?

    • Massive stars like Betelgeuse exhaust their hydrogen fuel and transition to using helium to create carbon.
    • The energy released during helium fusion is lower than that of hydrogen, requiring the star to burn more helium to maintain stability.
    • Eventually, the helium is depleted, leading to the star’s progression through various burning stages, including carbon and silicon burning.

    Pulsation and Betelgeuse’s Death Throes

    • Researchers studying Betelgeuse have observed its pulsation, indicating its stage of evolution.
    • The observed pulsation aligns with theoretical estimates of the late carbon-burning stage, suggesting that Betelgeuse is in its death throes.
    • Astronomers detect the expansion and contraction of Betelgeuse by analyzing its pulsation and corresponding brightness variations.
    • Previous studies disagreed on which pulsation period is fundamental, with one team considering 417 days and another team proposing 2,190 days.
    • Researchers conclude that it is in the final stage of burning carbon, considering the 2,190-day pulse as fundamental.

     

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  • IIT-M generates Hydrogen from Seawater

    hydrogen

    Central Idea

    • Researchers from IIT-Madras have developed components for a cost-effective method of electrolyzing seawater to produce green hydrogen.
    • The current alkaline water electrolyzer technology is energy-intensive, requires an expensive oxide-polymer separator, and uses fresh water.

    Generating Green Hydrogen

    • Instead of using fresh water, the researchers developed an electrolyzer that utilizes alkaline seawater.
    • Carbon-based support material was used for the electrodes to minimize corrosion.
    • Transition metal-based catalysts were designed to catalyze both oxygen and hydrogen evolution reactions, improving the production of hydrogen and oxygen.
    • A cellulose-based separator was developed to allow hydroxide ions to pass through while preventing crossover of oxygen and hydrogen.

    How does Electrolysis take place?

    • The alkaline water electrolyzer involves two half-reactions at the anode and cathode.
    • At the cathode, water dissociates into H+ and hydroxide ions, with H+ ions converting into hydrogen.
    • Hydroxide ions produced at the cathode pass through the separator, and oxygen is generated at the anode.
    • When seawater is used, hypochlorite formation occurs at the anode, causing corrosion and reducing oxygen production. Impurities also affect the hydrogen evolution reaction at the cathode.

    How were the Catalyst and Electrode designed?

    • The carbon-based support material was used for both anode and cathode electrodes to prevent corrosion.
    • The catalyst coating on the support material enhances hydrogen production at the cathode and oxygen production at the anode.
    • Transition bimetals in the catalyst are selective toward oxygen evolution reaction, overcoming the challenge of hypochlorite formation.
    • Despite impurities adsorbed on the cathode, the catalyst promotes hydrogen evolution, increasing hydrogen production.

    What made this device novel?

    • The team developed a cellulose-based separator to separate the anode and cathode.
    • The separator allows hydroxide ions to pass through but minimizes the crossover of hydrogen and oxygen.
    • The separator shows high resistance to degradation in seawater.

    Experimental Results and Performance

    • The assembled electrolyzer achieved a seawater splitting voltage of 1.73 V at 10 mA/sq.cm and 26 degrees C.
    • The optimized parameters enable the electrolyzer to directly use photovoltaic-derived voltage for green hydrogen production.
    • Two prototypes of different dimensions were developed, producing hydrogen at rates of 250 ml/hour and 1 liter/hour.
    • A stack of three cells produced hydrogen at a rate of about 4 liters/hour.

    Back2Basics: Hydrogen Categories

    Production Method Carbon Emissions
    Gray Hydrogen Steam Methane Reforming (SMR) from fossil fuels High emissions
    Blue Hydrogen Steam Methane Reforming (SMR) from fossil fuels with carbon capture and storage (CCS) or carbon capture utilization and storage (CCUS) Reduced emissions compared to gray hydrogen
    Green Hydrogen Electrolysis using renewable energy sources (solar, wind, hydro) No carbon emissions
    Turquoise Hydrogen Methane pyrolysis from fossil fuels with carbon capture and storage (CCS) or carbon capture utilization and storage (CCUS) Reduced emissions compared to gray hydrogen