Novel Sb-doped ruthenium oxide electrode with ordered nanotube structure and its electrocatalytic activity toward chlorine evolution

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• 作者：Huazhen Cao^a ; Donghui Lu^a ; Junpin Lin^b ; Qiao Ye^a ; Jiajun Wu^a ; Guoqu Zheng^a ; ^{zhenggq@zjut.edu.cn}
• 关键词：TiO2 nanotube arrays ; Electrodeposition ; Sb-doped RuO2 electrode ; Electrocatalytic activity
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：28 February, 2013
• 年：2013
• 卷：91
• 期：Complete
• 页码：234-239
• 全文大小：1193 K

文摘

An electrochemical method for the fabrication of nanostructured ruthenium oxide composite electrode from TiO₂ nanotube arrays (TNTs) is presented. Briefly, activated TNTs support with improved electrical property was obtained by heat treatment, and ruthenium was subsequently deposited along the inner and outer surface of TiO₂ nanotubes by electrochemical method. The as-prepared electrode showed a highly ordered nanotube structure with high specific surface area. Furthermore, the addition of Sb³⁺ into electrolyte could benefit the electrodeposition of ruthenium and the subsequent thermal oxidation process, which were proved by the more loaded RuO₂ nanoparticles and the smaller particle size. Sb-doped RuO₂/TNTs electrode prepared from the electrolyte containing a low concentration of Sb³⁺ showed a high electrocatalytic activity toward chlorine evolution, and the anodic current reached 170 mA cm^?2 at 1.2 V. Excess Sb³⁺ in electrolyte, however, would lead to a remarkable decrease in electrode property as antimony is not an active ingredient for chlorine evolution reaction. A model R_s(Q₁(R₁(R₂Q₂))) was proposed to analyze the electrochemical impedance characteristic of the nanostructured electrodes. The charge transfer resistance on the Sb-doped RuO₂/TNTs electrode was much smaller than that on a RuO₂/TNTs electrode.