双功能
分解水
电催化剂
阴极
材料科学
阳极
催化作用
纳米颗粒
化学工程
过渡金属
析氧
碳纤维
分子
纳米技术
电极
化学
电化学
物理化学
复合材料
有机化学
光催化
复合数
工程类
作者
Juncheng Wu,Zhe‐Fan Wang,Taotao Guan,Guoli Zhang,Juan Zhang,Jie Han,Shengqin Guan,Ning Wang,Jianlong Wang,Kaixi Li
摘要
Abstract Transition‐metal phosphides (TMPs) with high catalytic activity are widely used in the design of electrodes for water splitting. However, a major challenge is how to achieve the trade‐off between activity and stability of TMPs. Herein, a novel method for synthesizing CoP nanoparticles encapsulated in a rich‐defect carbon shell (CoP/DCS) is developed through the self‐assembly of modified polycyclic aromatic molecules. The graft and removal of high‐activity C–N bonds of aromatic molecules render the controllable design of crystallite defects of carbon shell. The density functional theory calculation indicates that the carbon defects with unpaired electrons could effectively tailor the band structure of CoP. Benefiting from the improved activity and corrosion resistance, the CoP/DCS delivers outstanding difunctional hydrogen evolution reaction (88 mV) and oxygen evolution reaction (251 mV) performances at 10 mA cm −2 current density. Furthermore, the coupled water electrolyzer with CoP/DCS as both the cathode and anode presents ultralow cell voltages of 1.49 V to achieve 10 mA cm −2 with long‐time stability. This strategy to improve TMPs electrocatalyst with rich‐DCS and heterogeneous structure will inspire the design of other transition metal compound electrocatalysts for water splitting.
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