电沉积NiCu合金锚定Co_2P纳米线调控电子结构增强的析氢反应

Electrodeposited NiCu Alloy Anchored Co2P Nanowires Enhancing Hydrogen Evolution Reaction by Modulating Electronic Structure

发展高效稳定的析氢反应(HER)是实现电解水技术广泛应用于工业的关键.本文以泡沫镍(NF)为基材,通过水热-热解-电沉积法合成了具有三维高分散非均相的HER催化剂CuAl@Co_(2)P/NF.研究发现,晶面与非晶面异质结的形成增加了该催化剂自身的活性位点,各元素之间的协同作用使体系内Co原子核外电子重新排布,降低了对吸附H^(*)的吸附能力,加快了析氢反应过程中的反应动力学.该催化剂在碱性和酸性介质中均表现出良好的HER活性和稳定性,电流密度为10 mA/cm^(2)时的过电势分别为83和27 mV,尤其在碱性环境下连续工作72 h后的电位基本保持不变.

The development of efficient and stable hydrogen evolution reaction(HER)is the key to realize the widespread industrial application of electrolytic water technology.In this paper,HER catalysts CuAl@Co_(2)P/NF with three-dimensional highly dispersed non-homogeneous phase were synthesized by hydrothermal-pyrolysis-electrodepo⁃sition using nickel foam(NF)as substrate.The formation of heterojunction between crystalline and amorphous surfaces increases the active sites of the catalyst itself,and the synergistic effect between the elements makes the Co atoms in the system rearrange their electrons outside the nucleus,reducing the adsorption capacity for the adsorbed H^(*),and accelerating the reaction kinetics in the process of hydrogen precipitation reaction.The catalyst exhibited favorable HER activity and stability in both alkaline and acidic environments,and the overpotential required to drive a current of 10 mA/cm^(2) was measured at 83 and 27 mV,respectively,while the potential remained essentially unchanged after continuous operation for 72 h in an alkaline environment.This work is informative for the construc⁃tion of HER catalysts with highly dispersed non-homogeneous phase pairs.