Electrochemical fabrication of porous Ni-Cu alloy nanosheets with high catalytic activity for hydrogen evolution
Electrochemical fabrication of porous Ni-Cu alloy nanosheets with high catalytic activity for hydrogen evolution
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电化学制备具有高析氢活性的多孔镍铜合金纳米片
DOI：
10.1016/j.electacta.2016.08.145
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发表时间：
2016-10-01
影响因子：
6.6
通讯作者：
Dong, P.
中科院分区：
文献类型：
--
作者：
Gao, M. Y.;Yang, C.;Dong, P.
采用恒电位电沉积法，在1：2的氯化胆碱-乙二醇共熔溶剂（乙醇）中，以氯化镍和氯化铜为电解液，在铜基体上直接制备了由纳米片组成的多孔Ni-Cu合金薄膜。电化学共沉积Ni-Cu合金在乙醇溶液中被发现是有利的，相比于传统的水溶液。沉积过程通过在初始阶段纳米颗粒的瞬时成核和生长发生，并且随着沉积时间的推移垂直发展以形成与纳米片排列的纳米多孔结构。所制备的多孔Ni-Cu合金纳米片阵列对碱性介质中的析氢反应（HER）表现出增强的电催化活性，在最佳条件下，其显示出57.2 mV dec（-1）的小Tafel斜率和-48 mV vs. RHE的低起始电位。它需要-128 mV和-150 mV的小过电位来驱动分别为10 mA cm（-2）和20 mA cm（-2）的催化电流密度。这种在乙醇中进行的简单电沉积方法提供了一种直接在集流体上制备多孔Ni基合金纳米片的有效方法，这是一种有前途的合成地球丰富的HER电催化剂的技术。(C)2016爱思唯尔有限公司版权所有。
Porous Ni-Cu alloy films composed of nanosheets are directly fabricated on Cu substrate using a facile potentiostatic electrodeposition approach from a 1: 2 choline chloride-ethylene glycol eutectic solvent (ethaline) containing nickel chloride and copper chloride. Electrochemical co-deposition of Ni-Cu alloy in ethaline is found to be thermodynamically favorable in comparison to conventional aqueous solutions. The deposition process occurs via an instantaneous nucleation and growth of nanoparticles at the initial stage and develops vertically to form nanoporous structures arrayed with nanosheets over deposition time. The as-prepared porous Ni-Cu alloy nanosheet arrays exhibit enhanced electrocatalytic activity for the hydrogen evolution reaction (HER) in alkaline media, which displays a small Tafel slope of 57.2 mV dec(-1) with a low onset potential of -48 mV vs. RHE at an optimal condition. It requires small overpotentials of -128 and -150 mV to drive catalytic current densities of 10 and 20 mA cm(-2), respectively. This facile electrodeposition method performed in ethaline provides an efficient way to fabricate porous Ni-based alloy nanosheets directly on a current collector, which is a promising technology for the synthesis of earth-abundant HER electrocatalysts. (C) 2016 Elsevier Ltd. All rights reserved.