Sturdy carbon fabric electrode provides consistent hydrogen emission for 800 hours within seawater.
In a groundbreaking development, a team at the Korea Institute of Energy Research (KIER) has created a carbon cloth electrode that can withstand industrial currents for over a month, paving the way for more efficient seawater electrolysis.
The new electrode, treated with a specific acid process, significantly increases the hydrophilicity of the carbon cloth, enabling a more uniform and enhanced distribution of metal catalyst ions such as cobalt, molybdenum, and ruthenium across its surface. This improved surface property facilitates better catalyst loading and interaction with the electrolyte, resulting in lower overpotential and higher efficiency in the hydrogen evolution reaction.
The acid treatment also enhances the electrode’s corrosion resistance and structural integrity, ensuring stable operation over long durations without significant metal ion leaching or performance degradation. In tests, the electrode maintained its initial performance after more than 800 hours of continuous operation at 500 mA/cm².
Traditional carbon cloth electrodes have struggled to withstand high current operation above 500 mA/cm² for more than 100 hours, a basic threshold for industrial use. However, the KIER team's electrode, using only 1% ruthenium by weight, reduced overpotential by about 25% compared to conventional cobalt-molybdenum catalysts. This combination leads to durable, efficient, and scalable seawater electrolysis performance suitable for commercialization.
The ability to reduce overpotential and the proven long-term stability in real seawater conditions could accelerate industrial adoption of seawater electrolysis. Seawater electrolysis could help bypass the limitation of relying on freshwater, which is under stress due to climate change, population growth, and competing demands.
The project, funded by the National Research Council of Science & Technology under South Korea’s Ministry of Science and ICT, was published in the online edition of Applied Surface Science. The findings suggest that with extended durability testing beyond 1,000 hours and research on scaling up to large-area cell modules and stacks, the technology could be further advanced to the demonstration level.
This development is a significant step towards reducing carbon emissions in various industries by harnessing hydrogen, a clean energy source. The team's work underscores the potential of carbon cloth as an alternative to metal-based supports due to its conductivity, corrosion resistance, flexibility, and cost benefits.
- The advancement in renewable energy technology, showcased by the carbon cloth electrode developed by KIER, could potentially revolutionize the industry by promoting efficient seawater electrolysis.
- A key aspect of this innovation is the significantly increased hydrophilicity of the carbon cloth, enabled by a specific acid process, which allows for better catalyst loading and interaction with the electrolyte.
- This research, supported by finance from South Korea’s Ministry of Science and ICT, hints at the possibility of further development towards demonstration level, with extensions in durability testing and research on large-area cell modules and stacks.
- The improved corrosion resistance and structural integrity of the carbon cloth electrode, ensuring stable operation for long periods without significant performance degradation, might attract significant interest from the finance sector, as it could lead to the commercialization of more efficient and scalable renewable energy solutions.
