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Green Hydrogen from Salt Water Using Catalyst

Here’s an article posted in Azo Clean Tech.

According to the article,

  • Challenge of Corrosion: Electrode corrosion in salt water is a major obstacle to mass-producing green hydrogen through electrolysis, requiring costly purification methods to obtain clean water.
  • Innovative Solutions: Researchers have developed coatings for electrodes, employed semi-permeable membranes, and created novel platinum catalysts to address corrosion and enhance efficiency in salt water electrolysis.
  • Potential Impact and Future Prospects: Despite challenges, green hydrogen production from seawater offers promise for addressing energy needs, especially with opportunities in offshore projects. Achieving long-term stability and selectivity remains a key focus for advancing this technology.

Know more about the process:

Here’s an elaboration on the process:

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  1. Electrolysis: Saltwater (or seawater) contains dissolved ions, including sodium (Na+), chloride (Cl-), magnesium (Mg2+), and sulfate (SO42-), among others. When electricity is passed through the saltwater, it undergoes electrolysis, which breaks down the water molecules (H2O) into hydrogen gas (H2) and oxygen gas (O2). This occurs at the cathode (where hydrogen is produced) and the anode (where oxygen is produced).
  2. Choice of Catalyst: The efficiency of electrolysis can be greatly enhanced by using a catalyst. A catalyst is a substance that speeds up a chemical reaction without being consumed itself. Commonly used catalysts for electrolysis include platinum, palladium, and iridium. However, these metals are expensive and not environmentally friendly to mine and process. Researchers are actively investigating alternative catalysts, such as those based on abundant and cheap materials like iron, nickel, or cobalt. These catalysts can potentially reduce the cost and environmental impact of hydrogen production.
  3. Renewable Energy Source: To ensure the production of green hydrogen, it’s crucial to power the electrolysis process using renewable energy sources such as solar, wind, or hydroelectric power. This ensures that the overall carbon footprint of hydrogen production is minimized.
  4. Efficiency and Cost Considerations: The efficiency of electrolysis, as well as the cost of production, are critical factors in making green hydrogen competitive with other forms of energy. Improvements in electrolysis technology, including the development of more efficient catalysts and better electrolysis systems, are ongoing to drive down costs and increase efficiency.
  5. Scale and Infrastructure: Scaling up green hydrogen production requires significant infrastructure investments, including electrolyzers, renewable energy installations, and transportation and storage facilities for the produced hydrogen. Governments and private investors are increasingly recognizing the potential of hydrogen as a clean energy carrier and are investing in the necessary infrastructure to support its widespread adoption.
  6. Environmental Benefits: Producing hydrogen from saltwater using renewable energy sources offers several environmental benefits. It reduces greenhouse gas emissions compared to traditional fossil fuel-based hydrogen production methods, helping mitigate climate change. Additionally, it can help reduce reliance on finite fossil fuel resources, promoting energy security and sustainability.
  7. Challenges and Future Outlook: While the potential for green hydrogen is promising, there are still challenges to overcome, including the development of more efficient electrolysis technologies, reducing costs, and establishing a robust infrastructure for hydrogen production, storage, and distribution. Continued research and investment in these areas are essential for realizing the full potential of green hydrogen as a clean and sustainable energy source.

In summary, producing green hydrogen from saltwater using a catalyst and renewable energy sources through electrolysis offers a promising pathway towards decarbonizing various sectors of the economy, including transportation, industry, and power generation. Continued advancements in technology and supportive policies are key to realizing the full potential of green hydrogen as a clean energy solution.

Interestingly, we have some other posts related to this content:

Green Hydrogen From Seawater Using Catalysts: UH researchers develop a catalyst for converting seawater to green hydrogen, a game-changer for regions with limited freshwater access. Green Hydrogen from Seawater Using PEM Electrolyzer by Fraunhofer ISE: Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE) has presented a green hydrogen production technique via proton exchange membrane (PEM) electrolyzer, employing seawater. Double-Membrane Electrolysis: A New Method for Producing Hydrogen Directly from Seawater – A new method called double-membrane electrolysis enables the extraction of hydrogen directly from seawater, operating without creating toxic by-products like bleach and chlorine.

About Narasimhan Santhanam (Narsi)

Narsi, a Director at EAI, Co-founded one of India's first climate tech consulting firm in 2008.

Since then, he has assisted over 250 Indian and International firms, across many climate tech domain Solar, Bio-energy, Green hydrogen, E-Mobility, Green Chemicals.

Narsi works closely with senior and top management corporates and helps then devise strategy and go-to-market plans to benefit from the fast growing Indian Climate tech market.


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