Facile preparation Pt on Au dendrites supported on Si (100) and their electrochemical properties for methanol and CO electrooxidation |
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Authors: | Yanling Zhang Hao Tong Zhipeng Sun Sudong Yang Zhuliang Wen Jiajia Zhu Liang Hao Yongqin Han Xiaogang Zhang |
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Institution: | (1) College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China;(2) Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117576, Singapore; |
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Abstract: | A new simple, time-saving method of preparing highly dispersed Pt nanoparticles with large electrochemically active area (ECA)
on three-dimensional dendrite-like Au supported on Si (100) was successfully developed by electroless displacement deposition
(EDD). The as-prepared catalysts were characterized by field-emission scanning electron microscope and high-resolution transmission
electron microscopy. The electro-catalytic properties of Pt/Au/Si for methanol and CO electrooxidation were investigated by
cyclic voltammetry, chronoamperometry, and electrochemical impedances spectra. The results show that Pt/Au/Si catalyst prepared
by EDD method presents the higher electro-catalytic activity and higher stability than that of Pt/Si composite. The electro-catalytic
activity of Pt supported on Au could be enhanced with the growth of Au, leading to the higher electro-catalytic properties
toward methanol and CO oxidation. The anodic peak of CO of Pt/Au/Si catalyst showed negatively shifted with respect to similarly
prepared Pt/Si electrode. The supposed schematic of the reaction was also introduced. Overall, the approach provides a convenient
method to prepare the Pt catalyst on Au dendrites with high ECA properties for DMFC and PEMFC through bottom-up assembly. |
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