Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 27, Pages 10934-10938Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202000383
Keywords
alkaline water electrolysis; electrocatalysis; hydrogen evolution reaction (HER); nickel-iron clusters; platinum
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Funding
- International Graduate School of Science and Engineering of Technical University of Munich [11.01]
- German Research Foundation (DFG) [355784621, BA 5795/3-1, Strategy-EXC 2089/1-390776260]
- China Scholarship Council [201806140125, 201706170015, 201606180040]
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Herein, we demonstrate an easy way to improve the hydrogen evolution reaction (HER) activity of Pt electrodes in alkaline media by introducing Ni-Fe clusters. As a result, the overpotential needed to achieve a current density of 10 mA cm(-2) in H-2-saturated 0.1 m KOH is reduced for the model single-crystal electrodes down to about 70 mV. To our knowledge, these modified electrodes outperform any other reported electrocatalysts tested under similar conditions. Moreover, the influence of 1) Ni to Fe ratio, 2) cluster coverage, and 3) the nature of the alkali-metal cations present in the electrolyte on the HER activity has been investigated. The observed catalytic performance likely originates from both the improved water dissociation at the Ni-Fe clusters and the subsequent optimal hydrogen adsorption and recombination at Pt atoms present at the Ni-Fe/Pt boundary.
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