Trimetallic oxyhydroxides as active sites for large-current-density alkaline oxygen evolution and overall water splitting

Lei Chen ¹Yunpeng Wang ²Xin Zhao ³Yuchao Wang ³Qian Li ³Qichen Wang ¹Yougen Tang ⁴Yongpeng Lei¹

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作者信息

1. State Key Laboratory of Powder Metallurgy,Hunan Key Laboratory of Two-Dimensional Materials,Central South University,Changsha 410083,China;Hunan Provincial Key Laboratory of Chemical Power Sources,College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China
2. School of Physics and Electronics,Hunan Key Laboratory for Super-micro structure and Ultrafast Process,Central South University,Changsha 410083,China
3. State Key Laboratory of Powder Metallurgy,Hunan Key Laboratory of Two-Dimensional Materials,Central South University,Changsha 410083,China
4. Hunan Provincial Key Laboratory of Chemical Power Sources,College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China
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Abstract

Earth-abundant electrocatalysts for large-current-density water splitting under alkaline condition are de-sirable.Oxygen evolution reaction,which is a bottleneck of the overall water splitting,faces the problems of complicated reconstruction and deficiency in rational design of active sites.Herein,we report a series of transition metal chalcogenides for alkaline OER.Among them,FeCoNi(S)displayed a low overpotential of 293 mV to deliver a current density of 500 mA cm-2,which is in the top level of non-precious metal based OER electrocatalysts.A combination of(ex)in situ characterizations and DFT calculation shows that Ni(Fe,Co)trimetallic oxyhydroxides were the active sites for highly-efficient OER.Furthermore,for Fe-CoNi(S),when used as a bifunctional catalyst for water splitting,it only required a cell voltage of 1.84 V to deliver～500 mA cm-2 with extraordinary long-term stability over 2000 h.This work provides the comprehension of high-efficiency,robust catalysts for OER and overall water splitting at large current densities in alkaline media.

Key words

Oxygen evolution/Active sites/Surface reconstruction/Large current density/Overall water splitting

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基金项目

Hunan Provincial Science and Technology Plan Project(2020JJ4710)

Hunan Key Laboratory of Two-Dimensional Materials(2018TP1010)

postdoctoral re-search funding plan in Central South University(140050022)

国家自然科学基金(12004439)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量56

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