介电谱
材料科学
循环伏安法
纳米棒
化学工程
X射线光电子能谱
氧化镍
镍
线性扫描伏安法
催化作用
氧化物
电化学
电极
无机化学
纳米技术
化学
冶金
有机化学
物理化学
工程类
作者
Li Zhang,Kun Xiong,Siguo Chen,Li Li,Zihua Deng,Zidong Wei
标识
DOI:10.1016/j.jpowsour.2014.10.038
摘要
In this paper we describe a novel catalyst based on RuO2–NiO nanorod arrays constructed in situ on a Ni foam substrate by a hydrothermal process for catalyzing the hydrogen evolution reaction (HER). Field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), linear scanning voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) are used to systematically investigate the microstructure, composition, and electrochemical performance of the catalyst. The prepared electrode exhibits excellent HER performance and long-term stability. This impressive electrochemical performance is largely attributed to the material's unique nanostructure. Noticeable the presence of nickel oxide/hydroxide on the surface of the catalyst promotes the dissociation of water and the formation of hydrogen intermediates that can then adsorb onto the nearby ruthenium species and recombine into molecular hydrogen at a very rapid rate. The hydrothermal method for directly growing electroactive nanostructured arrays on a conductive substrate offers a promising route for developing a new class of Ni-based high performance electrodes for the HER in practical applications.
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