Tailoring a local acid-like microenvironment for efficient neutral hydrogen evolution

Xiaozhong Zheng, Xiaoyun Shi, Honghui Ning, Rui Yang, Bing Lu, Qian Luo, Shanjun Mao, Lingling Xi and Yong Wang ()
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Xiaozhong Zheng: Zhejiang University
Xiaoyun Shi: Zhejiang University
Honghui Ning: Zhejiang University
Rui Yang: Zhejiang University
Bing Lu: Zhejiang University
Qian Luo: Zhejiang University
Shanjun Mao: Zhejiang University
Lingling Xi: Zhejiang University
Yong Wang: Zhejiang University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Electrochemical hydrogen evolution reaction in neutral media is listed as the most difficult challenges of energy catalysis due to the sluggish kinetics. Herein, the Ir-HxWO3 catalyst is readily synthesized and exhibits enhanced performance for neutral hydrogen evolution reaction. HxWO3 support is functioned as proton sponge to create a local acid-like microenvironment around Ir metal sites by spontaneous injection of protons to WO3, as evidenced by spectroscopy and electrochemical analysis. Rationalize revitalized lattice-hydrogen species located in the interface are coupled with Had atoms on metallic Ir surfaces via thermodynamically favorable Volmer-Tafel steps, and thereby a fast kinetics. Elaborated Ir-HxWO3 demonstrates acid-like activity with a low overpotential of 20 mV at 10 mA cm−2 and low Tafel slope of 28 mV dec−1, which are even comparable to those in acidic environment. The concept exemplified in this work offer the possibilities for tailoring local reaction microenvironment to regulate catalytic activity and pathway.

Date: 2023
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DOI: 10.1038/s41467-023-39963-8

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