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NH4F-Induced Morphology Control of CoP Nanostructures to Enhance the Hydrogen Evolution Reaction
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-06-30 , DOI: 10.1021/acs.inorgchem.1c01484
Tingting Xu 1, 2 , Liu Yang 1, 2 , Jing Li 3, 4 , Natalia Usoltseva 5 , Vladimir An 5 , Xin Jin 1 , Cai Zhang 1, 2 , Xinglai Zhang 1 , Baodan Liu 3, 4
Affiliation  

Developing non-noble metal catalysts with superior catalytic activity and excellent durability is critically essential to promote electrochemical water splitting for hydrogen production. Morphology control as a promising and effective strategy is widely implemented to change the surface atomic coordination and thus enhance the intrinsic catalytic performance of current electrocatalysts. Herein, a series of cobalt phosphide (CoP) electrocatalysts with tunable morphologies of nanosheets, nanowires, nanorods, and nanoblocks have been prepared for the enhanced hydrogen evolution reaction (HER) by only adjusting the amount of ammonium fluoride (NH4F) in the hydrothermal process. Benefiting from the large active area, high surface activity, and favorable ion and gas diffusion channels, the clustered CoP nanorods obtained at a concentration of 0.15 M NH4F show the best HER performance with only an overpotential of 71 mV at a current density of 10 mA cm–2 and a low Tafel slope of 60.75 mV dec–1 in 1 M KOH. After 3000 CV cycles and 24 h durability tests, there is only a very slight degradation of performance owing to its outstanding stability and robust substrate adhesion.

中文翻译:

NH 4 F诱导CoP纳米结构的形态学控制以增强析氢反应

开发具有优异催化活性和优异耐久性的非贵金属催化剂对于促进电化学水分解制氢至关重要。形态控制作为一种有前景且有效的策略被广泛实施以改变表面原子配位,从而提高当前电催化剂的内在催化性能。在此,通过仅调节氟化铵(NH 4)的量,制备了一系列纳米片、纳米线、纳米棒和纳米块形貌可调的磷化钴(CoP)电催化剂用于增强析氢反应(HER)。F) 在水热过程中。受益于大活性面积、高表面活性以及有利的离子和气体扩散通道,在 0.15 M NH 4 F浓度下获得的簇状 CoP 纳米棒显示出最佳的 HER 性能,在电流密度为 71 mV 时的过电位仅为10 mA cm –2和1 M KOH中 60.75 mV dec –1的低塔菲尔斜率。经过 3000 次 CV 循环和 24 小时耐久性测试后,由于其出色的稳定性和强大的基材附着力,性能仅略有下降。
更新日期:2021-07-19
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