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Highly durable, nonnoble metal electrodes for hydrogen production from seawater

Date:
January 11, 2024
Source:
University of Tsukuba
Summary:
The water electrolysis method, a promising avenue for hydrogen production, relies on substantial freshwater consumption, thereby limiting the regions available with water resources required for water electrolysis . Researchers have developed highly durable electrodes without precious metals to enable direct hydrogen production from seawater.
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Water electrolysis utilizing renewable energy sources emerges as a promising clean method for hydrogen production. However, its extensive freshwater consumption poses limitations to regions with abundant water resources. Therefore, it is imperative to develop a new technology for water electrolysis that can directly harness the abundant supply of seawater.

During seawater electrolysis, the anode reaction generates oxygen from water, chlorine gas, and hypochlorous acid from chloride ions. Precious metal electrodes, such as platinum oxide, ruthenium oxide, and iridium oxide, which are unaffected by chlorine, are widely used as anode electrodes. Although precious metals are undesirable as electrodes for the widespread seawater electrolysis technology, non-noble metals, which are highly reactive with chloride ions , cannot be employed for durable anodes.

The research group developed a multi-elemental alloy electrode composed of nine non-noble metal elements and conducted an accelerated degradation test, consisting of turning the power supply on and off, which mainly caused degradation during the operation of the water electrolysis system. The results suggest sustained anode performances for over a decade when powered by solar energy.

The anode made of this alloy requires higher voltages than that of the precious metal, such as iridium oxide. However, this anode offers direct seawater electrolysis without using fresh water. This innovation is expected to transcend geographical restrictions owing to the availability of fresh water, thereby promoting hydrogen production in regions abundant with renewable energy, such as coastal desert areas.


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Materials provided by University of Tsukuba. Note: Content may be edited for style and length.


Journal Reference:

  1. Fumiya Shiokawa, Aimi Asilah Haji Tajuddin, Tatsuhiko Ohto, Yue Yu, Takeshi Fujita, Hisanori Tanimoto, Zeyu Xi, Samuel Jeong, Yoshikazu Ito. Durable high-entropy non-noble metal anodes for neutral seawater electrolysis. Chemical Engineering Journal, 2024; 479: 147862 DOI: 10.1016/j.cej.2023.147862

Cite This Page:

University of Tsukuba. "Highly durable, nonnoble metal electrodes for hydrogen production from seawater." ScienceDaily. ScienceDaily, 11 January 2024. <www.sciencedaily.com/releases/2024/01/240111113226.htm>.
University of Tsukuba. (2024, January 11). Highly durable, nonnoble metal electrodes for hydrogen production from seawater. ScienceDaily. Retrieved March 2, 2024 from www.sciencedaily.com/releases/2024/01/240111113226.htm
University of Tsukuba. "Highly durable, nonnoble metal electrodes for hydrogen production from seawater." ScienceDaily. www.sciencedaily.com/releases/2024/01/240111113226.htm (accessed March 2, 2024).

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