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Fluorine-Induced Dual Defects in Cobalt Phosphide Nanosheets Enhance Hydrogen Evolution Reaction Activity
ACS Materials Letters ( IF 11.4 ) Pub Date : 2020-05-28 , DOI: 10.1021/acsmaterialslett.0c00209
Kun Xu 1 , Yiqiang Sun 2 , Xiuling Li 3 , Zihan Zhao 2 , Yongqi Zhang 1 , Cuncheng Li 2 , Hong Jin Fan 1
Affiliation  

Introduction of defects in a controllable way is important to modulate the electronic structure of catalysts toward enhancement of electrocatalytic activity. Herein we report that incorporation of fluorine into a cobalt phosphide alloy has a unique effect: it creates both F anion doping and P vacancies, resulting in a nearly 15-fold enhancement of the catalytic activity for the hydrogen evolution reaction (HER) in neutral solution. The existence of dual defects in CoP was confirmed by extended X-ray absorption fine structure (EXAFS) curve fitting results and density functional theory calculations. We show that the dual-defect feature is beneficial for increasing the active-site exposure, tuning the surface wettability, and optimizing the electronic configuration of CoP for the HER. Our fluorine-based modulation protocol may be applicable to other metal alloy electrocatalysts toward more efficient energy conversion reactions.

中文翻译:

氟化钴纳米片中氟诱导的双重缺陷增强了氢释放反应活性

以可控制的方式引入缺陷对于调节催化剂的电子结构以增强电催化活性很重要。在此,我们报告说,将氟混入磷化钴合金中具有独特的作用:它会同时产生F 阴离子掺杂和P空位,导致中性溶液中放氢反应(HER)的催化活性提高了近15倍。扩展的X射线吸收精细结构(EXAFS)曲线拟合结果和密度泛函理论计算证实了CoP中双缺陷的存在。我们表明,双重缺陷功能有利于增加活动部位的暴露程度,调整表面润湿性以及优化HER的CoP的电子配置。我们的基于氟的调制协议可能适用于其他金属合金电催化剂,以实现更高效的能量转换反应。
更新日期:2020-07-06
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