Interfacial Assemble of Prussian Blue Analog to Access Hierarchical FeNi (oxy)-Hydroxide Nanosheets for Electrocatalytic Water Splitting

Developing facile methods for the synthesis of active and stable electrocatalysts is vitally important to realize overall water splitting. Here, we demonstrate a practical method to obtain FeNiOOH nanosheets on nickel foam (NF) as bifunctional electrocatalyst by growing a FeCo Prussian blue analog w...

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Published inFrontiers in chemistry Vol. 10; p. 895168
Main Authors Hong, Jinquan, Lv, Jiangquan, Chen, Jialing, Cai, Lanxin, Wei, Mengna, Cai, Guoseng, Huang, Xin, Li, Xiaoyan, Du, Shaowu
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media S.A 27.04.2022
Subjects
Chemistry
FeNiOOH nanosheet
hydrogen evolution
oxygen evolution
Prussian blue analog
water splitting
FeNiOOH nanosheet
hydrogen evolution
water splitting
Prussian blue analog
oxygen evolution
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Summary:Developing facile methods for the synthesis of active and stable electrocatalysts is vitally important to realize overall water splitting. Here, we demonstrate a practical method to obtain FeNiOOH nanosheets on nickel foam (NF) as bifunctional electrocatalyst by growing a FeCo Prussian blue analog with further oxidation under ambient conditions. The binder-free, self-standing FeNiOOH/NF electrode with hierarchical nanostructures requires low overpotentials of 260 mV and 240 mV at a current density of 50 mA cm for oxygen evolution reaction and hydrogen evolution reaction, respectively, in 1.0 M KOH solution. Therefore, an alkaline water electrolyzer constructed by bifunctional FeNiOOH/NF electrode as both anode and cathode delivers 50 mA cm under a cell voltage of 1.74 V with remarkable stability, which outperforms the IrO -Pt/C-based electrolyzer. The excellent performance could be ascribed to the superior FeNiOOH intrinsic activity and the hierarchical structure. This work provides a cost-efficient surface engineering method to obtain binder-free, self-standing bifunctional electrocatalyst on commercial NF, which could be further extended to other energy and environment applications.
Bibliography:Reviewed by: Zhao Sun, Central South University, China
This article was submitted to Catalytic Reactions and Chemistry, a section of the journal Frontiers in Chemistry
Edited by: Runping Ye, Nanchang University, China
Jianghao Wang, Zhejiang University, China
ISSN:2296-2646
2296-2646
DOI:10.3389/fchem.2022.895168