Water-hydroxide trapping in cobalt tungstate for proton exchange membrane water electrolysis

The oxygen evolution reaction is the bottleneck to energy-efficient water-based electrolysis for the production of hydrogen and other solar fuels. In proton exchange membrane water electrolysis (PEMWE), precious metals have generally been necessary for the stable catalysis of this reaction. In this...

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Published in:Science (American Association for the Advancement of Science) Vol. 384; no. 6702; p. 1373
Main Authors: Ram, Ranit, Xia, Lu, Benzidi, Hind, Guha, Anku, Golovanova, Viktoria, Garzón Manjón, Alba, Llorens Rauret, David, Sanz Berman, Pol, Dimitropoulos, Marinos, Mundet, Bernat, Pastor, Ernest, Celorrio, Veronica, Mesa, Camilo A, Das, Aparna M, Pinilla-Sánchez, Adrián, Giménez, Sixto, Arbiol, Jordi, López, Núria, García de Arquer, F Pelayo
Format: Journal Article
Language:English
Published: United States 21.06.2024
ISSN:1095-9203, 1095-9203
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Summary:The oxygen evolution reaction is the bottleneck to energy-efficient water-based electrolysis for the production of hydrogen and other solar fuels. In proton exchange membrane water electrolysis (PEMWE), precious metals have generally been necessary for the stable catalysis of this reaction. In this work, we report that delamination of cobalt tungstate enables high activity and durability through the stabilization of oxide and water-hydroxide networks of the lattice defects in acid. The resulting catalysts achieve lower overpotentials, a current density of 1.8 amperes per square centimeter at 2 volts, and stable operation up to 1 ampere per square centimeter in a PEMWE system at industrial conditions (80°C) at 1.77 volts; a threefold improvement in activity; and stable operation at 1 ampere per square centimeter over the course of 600 hours.
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ISSN:1095-9203
1095-9203
DOI:10.1126/science.adk9849