Fabrication of three-dimensional nanoporous nickel films with tunable nanoporosity and their excellent electrocatalytic activities for hydrogen evolution reaction
Fabrication of three-dimensional nanoporous nickel films with tunable nanoporosity and their excellent electrocatalytic activities for hydrogen evolution reaction
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纳米孔隙率可调的三维纳米多孔镍薄膜的制备及其优异的析氢反应电催化活性
DOI：
10.1016/j.ijhydene.2012.10.084
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发表时间：
2013-01-24
影响因子：
7.2
通讯作者：
Cao, Chu-nan
中科院分区：
文献类型：
--
作者：
Cai, Jing;Xu, Ling;Cao, Chu-nan
采用一种新颖、简便的方法制备了三维纳米多孔镍薄膜。制备过程包括热处理镍基体上的电沉积锌层和随后的电化学去合金化。Ni2Zn11合金表面膜的形成是由于热处理过程中Ni和Zn的相互扩散所致。采用电化学方法将活性较高的锌从合金表面膜上脱合金，得到了具有开孔和互连韧带的三维纳米多孔镍膜。随着电沉积锌量的增加，纳米多孔镍膜的厚度、孔径和孔密度均增大。在我们的实验范围内，最厚的纳米多孔镍膜的厚度为8 μ m，平均孔径为700 nm。所制备的三维纳米多孔镍薄膜对析氢反应的电催化活性远高于光滑镍箔，且随着孔隙率和厚度的增加，其析氢电催化活性增强。结果表明，所制备的三维纳米多孔镍薄膜具有独特的纳米结构特征，具有较高的电催化活性和良好的电化学稳定性。版权所有（C）2012，氢能出版物有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Three-dimensional (3D) nanoporous nickel films were fabricated by a novel and facile method. The fabrication process involved the heat treatment of the electrodeposited zinc layer on nickel substrate and the subsequent electrochemical dealloying. The mutual diffusion of Ni and Zn during the heat treatment resulted in the formation of the Ni2Zn11 alloy surface film. The 3D nanoporous nickel films with open pores and interconnected ligaments were obtained by the electrochemical dealloying of relatively active zinc from the alloy surface film. As the electrodeposited zinc amount increased, the thickness, pore diameter and pore density of the nanoporous nickel films became larger. In our experimental range, the thickest nanoporous nickel film presented a thickness of 8 mu m and an average pore diameter of 700 nm. The as-prepared 3D nanoporous nickel films exhibited much higher electrocatalytic activity for hydrogen evolution reaction (HER) than smooth nickel foil, and their electrocatalytic activities for HER enhanced with increase in the porosity and thickness. It was concluded that the enhanced electrocatalytic activity and excellent electrochemical stability for HER of the as-prepared 3D nanoporous nickel films can be ascribed to their unique nanostructured characteristics. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.