Preparation and Characterization of Zirconia-Coated Nanodiamonds as a Pt Catalyst Support for Methanol Electro-Oxidation.
Zirconia-coated nanodiamond (ZrO₂/ND) electrode material was successfully prepared by one-step isothermal hydrolyzing from ND-dispersed ZrOCl₂·8H₂O aqueous solution. High-resolution transmission electron microscopy reveals that a highly conformal and uniform ZrO₂ shell was deposited on NDs by this simple method. The coating obtained at 90 °C without further calcination was mainly composed of monoclinic nanocrystalline ZrO₂ rather than common amorphous Zr(OH)₄ clusters. The ZrO₂/NDs and pristine ND powder were decorated with platinum (Pt) nanoparticles by electrodeposition from 5 mM chloroplatinic acid solution. The electrochemical studies indicate that Pt/ZrO₂/ND catalysts have higher electrocatalytic activity and better stability for methanol oxidation than Pt/ND catalysts in acid.
Institute of Manufacturing Engineering, Huaqiao University, Xiamen 361021, China. lujing26@hqu.edu.cn.
Jing
J
Lu
Institute of Manufacturing Engineering, Huaqiao University, Xiamen 361021, China. zangjianbing@163.com.|State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, China. zangjianbing@163.com.
Jianbing
J
Zang
Institute of Manufacturing Engineering, Huaqiao University, Xiamen 361021, China. diamond_wangyanhui@163.com.|State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, China. diamond_wangyanhui@163.com.
Yanhui
Y
Wang
Institute of Manufacturing Engineering, Huaqiao University, Xiamen 361021, China. beyondmyselfxyc@163.com.
Yongchao
Y
Xu
Institute of Manufacturing Engineering, Huaqiao University, Xiamen 361021, China. xpxu@hqu.edu.cn.
Xipeng
X
Xu
Pt nanoparticles; ZrO2 shell; deposition; nanodiamond; oxidation