纳米片
分解水
析氧
催化作用
异质结
材料科学
化学工程
热液循环
密度泛函理论
纳米技术
化学
电化学
电极
光电子学
物理化学
计算化学
光催化
生物化学
工程类
作者
Ning Cao,Shan Chen,Yiming Di,Chao Li,Hao Qi,Qingguo Shao,Weimin Zhao,Yijiang Qin,Xiaobei Zang
标识
DOI:10.1016/j.electacta.2022.140674
摘要
Designing heterostructure in electrocatalysts can enhance the reaction kinetics of overall water splitting by exposing more active sites and promoting the electron transfer. Mo-based and Ni-based sulfides, which have respectively shown excellent catalytic activity in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), can remedy the shortcomings of single half-reaction by synergistic effect. Herein, we realized the in-situ growth of Co-doped NiS2/MoS2 nanosheet on CFP (Co-NiS2/MoS2) using a two-step hydrothermal method. The Co-NiS2/MoS2 nanosheets exhibit superior activity for durable HER and OER, obviously superior to those of the single-structure catalysts. Moreover, the cell voltage is only 1.63 V at 10 mA cm−2 for overall water splitting. The density functional theory simulation results show the hydrogen adsorption energy in Co-NiS2/MoS2 system is closer to zero than others, further suggesting heterostructure can reduce energy barrier of water splitting.
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