纳米管
X射线光电子能谱
过电位
纳米棒
析氧
催化作用
纳米技术
电催化剂
化学工程
化学
蚀刻(微加工)
扫描电子显微镜
透射电子显微镜
纳米颗粒
电化学
材料科学
电极
碳纳米管
复合材料
物理化学
有机化学
图层(电子)
工程类
作者
Chenxing Zhao,Hongtao Yu,Yunchao Li,Xiaohong Li,Ling Ding,Louzhen Fan
标识
DOI:10.1016/j.jelechem.2012.08.032
摘要
A novel template-assisted deposition and etching strategy is proposed in this paper for preparing IrO2 nanotube arrays on ITO substrates, i.e., electrodepositing IrO2 nanoparticles onto ZnO nanorod surfaces to produce IrO2-coated core–shell nanorod arrays, and followed by wet chemical etching the ZnO nanorods away to generate IrO2 nanotube arrays. Well-aligned IrO2 nanotube arrays with high purity and uniform size are produced by using this synthetic strategy. Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) are employed to examine the morphology, fine structure and composition of the IrO2 nanotube arrays intensively. Furthermore, electrocatalytic water oxidization experiments are performed to assess the catalytic performance of the as-prepared IrO2 nanotube arrays toward oxygen evolution reaction (OER). The IrO2 nanotube arrays have been found to possess an excellent catalytic performance: high turnover frequency (3.3 s−1 for TOF at 1.2 V versus Ag/AgCl), low oxygen evolution overpotential (η = 0.15 V) and good catalytic stability (55% catalytic activity remaining after undergoing 400 times potential cycles).
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