过电位
分解水
电催化剂
材料科学
纳米片
析氧
电化学
双功能
催化作用
无机化学
电极
化学工程
纳米技术
物理化学
化学
生物化学
光催化
工程类
作者
Yiqiang Sun,Ke Xu,Zengxi Wei,Huilin Li,Tao Zhang,Xinyang Li,Weiping Cai,Jianmin Ma,Hong Jin Fan,Yue Li
标识
DOI:10.1002/adma.201802121
摘要
Abstract Exploring highly efficient and low‐cost electrocatalysts for electrochemical water splitting is of importance for the conversion of intermediate energy. Herein, the synthesis of dual‐cation (Fe, Co)‐incorporated NiSe 2 nanosheets (Fe, Co‐NiSe 2 ) and systematical investigation of their electrocatalytic performance for water splitting as a function of the composition are reported. The dual‐cation incorporation can distort the lattice and induce stronger electronic interaction, leading to increased active site exposure and optimized adsorption energy of reaction intermediates compared to single‐cation‐doped or pure NiSe 2 . As a result, the obtained Fe 0.09 Co 0.13 ‐NiSe 2 porous nanosheet electrode shows an optimized catalytic activity with a low overpotential of 251 mV for oxygen evolution reaction and 92 mV for hydrogen evolution reaction (both at 10 mA cm −2 in 1 m KOH). When used as bifunctional electrodes for overall water splitting, the current density of 10 mA cm −2 is achieved at a low cell voltage of 1.52 V. This work highlights the importance of dual‐cation doping in enhancing the electrocatalyst performance of transition metal dichalcogenides.
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