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9. Fe2+/Fe3+ Cycling for Coupling Self‐Powered Hydrogen Evolution and Preparation of Electrode Catalysts.

Author

Chen, Chang, Fu, Zhengqian, Qi, Fenggang, Chen, Yafeng, Meng, Ge, Chang, Ziwei, Kong, Fantao, Zhu, Libo, Tian, Han, Huang, Haitao, Cui, Xiangzhi, and Shi, Jianlin

Subjects
HYDROGEN evolution reactions, FLOW batteries, HYDROGEN production, HYDROGEN, CATALYSTS, CATALYTIC activity, CATALYTIC converters for automobiles
Abstract

A novel Zn−Fe flow battery featuring an Fe3+ reduction reaction (Fe3+RR)‐coupled zinc oxidation, and an Fe2+ oxidation reaction (Fe2+OR)‐coupled hydrogen evolution reaction (HER) system as well, was established. This battery is capable of driving two Fe2+OR‐coupled HER systems in series based on the above Fe2+/Fe3+ cycling, for efficient self‐powered hydrogen evolution. Meanwhile, this Fe2+/Fe3+ cycling enables the preparation of a multifunctional catalyst, Pt‐3@SXNS (siloxene nanosheet), by the Fe2+OR‐promoted dispersion of Pt nanoparticles on SXNS; alternatively, this support could be obtained by Fe3+RR‐assisted exfoliation using Fe3+ from the anolyte of Fe2+OR‐coupled HER. The Pt‐3@SXNS catalyst exhibits excellent catalytic activities toward Fe3+RR in the Zn−Fe flow battery, HER, and Fe2+OR in the electrolyzer, which is attributed to the strong electronic interaction between Pt and Si. This work offers a new strategy for energy storage and low‐cost hydrogen production from acidic wastewater. [ABSTRACT FROM AUTHOR]

Published
2022
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