Mo-doping-assisted electrochemical transformation to generate CoFe LDH as the highly efficient electrocatalyst for overall water splitting

被引：47
作者：
Zhao G. [1 ]
Wang B. [1 ]
Yan Q. [1 ]
Xia X. [2 ]
机构：
[1] College of Chemistry, Xinjiang University, Shengli Road, Tianshan District, Urumqi, 830046, Xinjiang
[2] Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education and Xinjiang Uyghur Auton omous Region, School of Chemical Engineering and Technology, Xinjiang Univversity, Urumqi
来源：
Journal of Alloys and Compounds | 2022年 / 902卷
基金：
中国国家自然科学基金;
关键词：
Doping; Electrochemical transformation; Layered double hydroxide; Overall water splitting; Prussian blue nanocubes;
D O I：
10.1016/j.jallcom.2022.163738
中图分类号：
学科分类号：
摘要：
Facile preparation of efficient, low-cost, and stable bifunctional electrocatalysts for overall water splitting remains a big challenge. Herein, we successfully synthesized Mo-doped CoFe layered double hydroxides (Mo-doped CoFe LDH/NF) nanosheets by electrochemical transformation of Mo-doped CoFe prussian blue nanocubes on nickel foam (Mo-doped CoFe PBA/NF) for highly efficient overall water splitting. The catalyst exhibits outstanding oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performance after electrochemical transformation, which is due to the abundant edge defects of Mo-doped CoFe LDH/NF can expose more active sites. Meanwhile, Mo6+ has a strong electron absorption ability, which could adjust the electronic structure and stabilize the high valence active sites. It only requires a low overpotential for OER (331 mV) and HER (227 mV) to reach 100 mA cm−2 in alkaline media, respectively. Notably, when it was employed as a bifunctional electrode, Mo-doped CoFe LDH/NF displays a low potential of 1.55 V to reach 100 mA cm−2 coupled with long-term water splitting stability in an alkaline electrolyte. This work not only developed a novel method for the synthesis of efficient double-layer hydroxide catalysts, but also paved the way for the rational design of bifunctional electrocatalysts with practical application value. © 2022 Elsevier B.V.
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