Journal
CHEMSUSCHEM
Volume 15, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202201088
Keywords
electrocatalysis; electrochemistry; electrolytes; seawater; water splitting
Funding
- JSPS KAKENHI [19KK0126]
- Mohammed bin Salman Center for Future Science and Technology for Saudi-Japan Vision 2030 at The University of Tokyo [MbSC2030]
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Direct seawater electrolysis simplifies the process and reduces the cost of green hydrogen production, but impurities in seawater, especially chloride ions, can cause electrode corrosion. The CoFeOxHy/Ti electrode with carefully tuned properties shows efficient oxygen evolution reaction catalysis with an active site motif and enlarged surface area.
Direct seawater electrolysis potentially simplifies the electrolysis process and leads to a decrease in the cost of green hydrogen production. However, impurities present in the seawater, especially chloride ions (Cl-), cause corrosion of the electrode material, and its oxidation competes with the anodic oxygen evolution reaction (OER). By carefully tuning electrode substrate and electrolyte solutions, the CoFeOxHy/Ti electrode with high double-layer capacitance actively and stably electro-catalyzed the OER in potassium borate solutions at pH 9.2 in the presence of 0.5 mol kg(-1) Cl-. The electrode possesses an active site motif composed of either a Co- or Fe-domain and benefits from an enlarged surface area. Selective OER was demonstrated in Cl--containing electrolyte solutions at an elevated reaction temperature, stably achieving 500 mA cm(-2) at a mere potential of 1.67 V vs. reversible hydrogen electrode (RHE) at 353 K for multiple on-off and long-term testing processes with a faradaic efficiency of unity toward the OER.
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