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- Title
Facile preparation Pt on Au dendrites supported on Si (100) and their electrochemical properties for methanol and CO electrooxidation.
- Authors
Zhang, Yanling; Tong, Hao; Sun, Zhipeng; Yang, Sudong; Wen, Zhuliang; Zhu, Jiajia; Hao, Liang; Han, Yongqin; Zhang, Xiaogang
- 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.
- Subjects
DENDRITIC crystals; ELECTROCHEMISTRY; METHANOL; OXIDATION; VOLTAMMETRY; TRANSMISSION electron microscopy
- Publication
Journal of Solid State Electrochemistry, 2011, Vol 15, Issue 10, p2231
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-010-1239-x