Fabrication of macroporous Pt and PtAu electrodes for electrochemical application through galvanic replacement at macroporous Cu electrode electrodeposited at polystyrene template from room temperature ionic liquid

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• 作者：Shu-Jian Huang ; Po-Yu Chen¹ ; ^{pyc@kmu.edu.tw}
• 关键词：Electrodeposition ; Electrocatalytic ethanol oxidation ; Macroporous electrode ; Polystyrene template ; Room temperature ionic liquid
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：1 February, 2013
• 年：2013
• 卷：89
• 期：Complete
• 页码：180-190
• 全文大小：2781 K

文摘

Macroporous Pt and PtAu electrodes (MP-Pt and MP-PtAu) were prepared through galvanic replacement at macroporous Cu electrodes, which were formed by electrodeposition of Cu at Au-coated indium tin oxide (Au/ITO) electrodes covered with ordered arrays of polystyrene (PS) nanospheres (PS/Au/ITO) in N-butyl-N-methylpyrrolidinium dicyanamide room temperature ionic liquid (BMP-DCA RTIL). After dissolving the PS templates in tetrahydrofuran (THF), macroporous Cu electrodes (MP-Cu/Au/ITO; denoted as MP-Cu hereafter) were obtained. The surface of a MP-Cu was spontaneously replaced by Pt or Pt/Au when a MP-Cu was immersed in an aqueous solution containing H₂PtCl₆ or H₂PtCl₆/HAuCl₄ to form the MP-Pt (actually, MP-Pt/Cu/Au/ITO) or MP-PtAu electrodes. The atomic ratios of Au in PtAu could be adjusted by changing the concentration of HAuCl₄ in the mixtures of H₂PtCl₆/HAuCl₄. The electrodeposition potential, the time of replacement reaction, the concentrations of H₂PtCl₆ and HAuCl₄, and the content of surfactant, which influence the structure of macroporous electrodes, were investigated. The surface morphologies of these macroporous electrodes were characterized with scanning electron microscope (SEM). MP-PtAu electrodes showed the better performance than the MP-Pt electrodes on the electrocatalytic oxidation of ethanol in alkaline solutions.