IrW nanochannel support enabling ultrastable electrocatalytic oxygen evolution at 2 A cm−2 in acidic media

Rui Li, Haiyun Wang, Fei Hu (), K. C. Chan (), Xiongjun Liu, Zhaoping Lu, Jing Wang, Zhibin Li, Longjiao Zeng, Yuanyuan Li, Xiaojun Wu () and Yujie Xiong ()
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Rui Li: Northwestern Polytechnical University
Haiyun Wang: University of Science and Technology of China
Fei Hu: Foshan University
K. C. Chan: The Hong Kong Polytechnic University
Xiongjun Liu: University of Science and Technology Beijing
Zhaoping Lu: University of Science and Technology Beijing
Jing Wang: University of Science and Technology Beijing
Zhibin Li: University of Science and Technology Beijing
Longjiao Zeng: Foshan University
Yuanyuan Li: Foshan University
Xiaojun Wu: University of Science and Technology of China
Yujie Xiong: University of Science and Technology of China

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract A grand challenge for proton exchange membrane electrolyzers is the rational design of oxygen evolution reaction electrocatalysts to balance activity and stability. Here, we report a support-stabilized catalyst, the activated ~200 nm-depth IrW nanochannel that achieves the current density of 2 A cm−2 at an overpotential of only ~497 mV and maintains ultrastable gas evolution at 100 mA cm−2 at least 800 h with a negligible degradation rate of ~4 μV h−1. Structure analyses combined with theoretical calculations indicate that the IrW support alters the charge distribution of surface (IrO2)n clusters and effectively confines the cluster size within 4 (n≤4). Such support-stabilizing effect prevents the surface Ir from agglomeration and retains a thin layer of electrocatalytically active IrO2 clusters on surface, realizing a win-win strategy for ultrahigh OER activity and stability. This work would open up an opportunity for engineering suitable catalysts for robust proton exchange membrane-based electrolyzers.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23907-1

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DOI: 10.1038/s41467-021-23907-1

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