材料科学
钴
析氧
氧化钴
氢氧化钴
化学工程
磷化物
电解质
氢氧化物
催化作用
氧化物
无机化学
异质结
物理化学
电极
化学
镍
电化学
光电子学
冶金
工程类
生物化学
作者
Xuemin Hu,Shengli Zhang,Jingwen Sun,Lei Yu,Xingyue Qian,Rudan Hu,Yining Wang,Huanyu Zhao,Jun Zhu
出处
期刊:Nano Energy
[Elsevier]
日期:2019-02-01
卷期号:56: 109-117
被引量:219
标识
DOI:10.1016/j.nanoen.2018.11.047
摘要
Two-dimensional (2D) heterostructures have emerged as promising electrocatalysts towards oxygen evolution reaction due to their unique structural and chemical properties. Moreover, 2D lateral heterostructure with the coupled interface in-plane rather than the vertical direction enables to expose more active sites to catalyst surface, and thus facilitates the OER catalytic activity. Here, 2D FeCo layered double hydroxide/cobalt oxide (FeCo LDH/CoO) nanosheets are synthesized via an instantaneous method utilizing molten alkali as both solvent and reactant. Upon a selective low-temperature phosphorization, 2D Fe-containing cobalt phosphide/cobalt oxide (Fe-CoP/CoO) lateral heterostructure with the optimized electronic structure and activated electronic coupling interface is obtained and exhibits superior catalytic activity (η = 219 mV at 10 mA cm−2) compared to most of the reported electrocatalysts towards OER in alkaline electrolyte. Besides, both of the experimental characterization and DFT calculation are performed to illustrate the detailed mechanism of the attractive OER activity. It is uncovered that the coupled interface between CoP and CoO induces the redistribution of electrons, facilitates the adsorption of OH- anions easily, and thus optimizes Gibbs free energies for water oxidation.
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