分解水
双功能
过电位
电催化剂
材料科学
化学工程
电化学
电解
阳极
电解水
无机化学
催化作用
阴极
制氢
析氧
化学
电极
物理化学
光催化
电解质
工程类
生物化学
作者
Jie Wang,Guicai Lv,Cheng Wang
标识
DOI:10.1016/j.apsusc.2021.151182
摘要
Hydrogen production by electrochemical overall water splitting is considered as a clean and renewable approach for greener energy. However, the efficiency of water electrolysis suffers from the sluggish kinetics and high overpotential of OER. Although NiFe LDH is regarded as a promising OER catalyst, it faces the problem of poor conductivity, resulting in the limitations of HER performance. Herein, a hybrid nano-architecture of [email protected] LDH as a bifunctional electrocatalyst for overall water splitting is fabricated via in-situ electrochemically assembling hierarchical NiFe LDH nanosheets on the surface of CoNiN. [email protected] LDH shows excellent activities for OER with the overpotentials of 227 and 291 mV to deliver the current densities of 10 and 100 mA cm−2, respectively. Moreover, an alkaline electrolyzer with [email protected] LDH as anode and cathode requires a cell voltage of 1.63 V to achieve 10 mA cm−2. In addition, the excellent stability with 100 h towards overall water splitting outperforms most transition metal-based bifunctional electrocatalysts. The superior performance is attributed to the abundant active sites, the strong electronic interaction, and the corresponding metal (oxy)hydroxides species generated by in situ surface reconstruction and phase transformation.
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