Silver decorated hydroxides electrocatalysts for efficient oxygen evolution reaction

被引:24
作者
Wu, Lingling [1 ]
Zhang, Junjie [1 ]
Wang, Sihong [1 ]
Jiang, Qu [1 ]
Feng, Ruohan [1 ]
Ju, Shenghong [2 ]
Zhang, Wang [1 ]
Song, Fang [1 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, China UK Low Carbon Coll, Shanghai 201306, Peoples R China
基金
中国国家自然科学基金;
关键词
Water splitting; Oxygen evolution reaction; Electrocatalysts; Layered double hydroxides; ENHANCED CATALYTIC-ACTIVITY; LAYERED DOUBLE HYDROXIDE; IN-SITU RAMAN; WATER OXIDATION; ELECTROCHEMICAL EVOLUTION; GOLD; OXIDE; NANOWIRES; AG;
D O I
10.1016/j.cej.2022.136168
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Electrocatalysts play a pivotal role in electrochemical water splitting, where the development of efficient oxygen evolution reaction (OER) electrocatalysts remains challenging. Here, we report a facile one-step blending approach to synthesize efficient and durable OER electrocatalysts of silver decorated hydroxides (Ag@hydroxides). The general efficacy of this methodology is demonstrated in five hydroxides, in form of powders or selfsupported electrodes. The decoration of Ag lowers the overpotentials by 41-56 mV, rendering Ag@NiFe LDH among the most active OER catalysts. It requires an overpotential of 246 mV only to deliver a current density of 10 mA cm-2. Under industrial electrolysis conditions (30 wt% KOH and 80 degrees C), the cell voltage is 1.76 V for 500 mA cm-2. It is 270 mV lower than the intact nickel mesh, corresponding to a 9% improvement in the energy conversion efficiency. Furthermore, by combining spectroscopic analysis and theoretical calculation we unravel that the strong interfacial charge transfer is the root cause for the promoting catalytic activity, where the binding energies of catalytic intermediates are optimized. This work provides a facile and ease-to-scale-up approach for the synthesis of efficient and durable electrocatalysts and demonstrates the power of regulating the interface in improving electrocatalytic kinetics.
引用
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页数:11
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