碱金属
钴
氢氧化物
电催化剂
催化作用
电解
磷酸盐
碱性水电解
氢
电解水
过渡金属
材料科学
无机化学
分解水
离子交换
化学
电化学
离子
电极
物理化学
有机化学
光催化
电解质
作者
Huanhuan Liu,Siyuan Liu,Shoufu Cao,Jingrui Zhang,Hao Ni,Xiujuan Lin,Xiao Chen,Shuxian Wei,Qi Hou,Zhaojie Wang,Xiaoqing Lu
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2022-05-16
卷期号:10 (21): 7100-7107
被引量:7
标识
DOI:10.1021/acssuschemeng.2c01203
摘要
Developing efficient and low-cost electrocatalysts is critical for hydrogen evolution by water splitting. Nonsubjective reconstruction is one of the main issues that induces difficulty to develop and understand the well-defined structure during the electrocatalysis. By studying the anion-exchange between phosphate and hydroxide, cobalt hydroxide nanosheets incorporated with phosphate inherited from cobalt phosphate are obtained, which provides a new case of metallic transition metal hydroxide. Benefiting from more exposed active sites, effective electron transport, and optimized electronic structure, the residual phosphate in two-dimensional Co(OH)2 gives rise to significant improvement in alkaline hydrogen evolution. Particularly, it can survive at 1600 mA cm–2 and maintain stability over 100 h under industrial conditions (6 M KOH at 60 °C). Density functional theory calculations and the confirmatory experiments of reverse anion-exchange from Co(OH)2 are investigated to confirm the successful engineering of metallic character and electronic structure. This work provides a facile modification of practical electrodes with phosphate groups for industrial water electrolysis as well as gaining insights into the reconstruction of cobalt-based electrocatalysts in alkali to become an effective catalyst.
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