Preparation and characterization of Pt/TiO₂ nanofibers catalysts for methanol electro-oxidation

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• 作者：Yingping Zheng ; Hong Chen ; Yunqian Dai ; Nengneng Zhang ; Wanlong Zhao ; Shixian Wang ; Yongbing Lou ; Ying Li ; Yueming Sun
• 关键词：Electrospinning ; TiO2 nanofibers ; Platinum nanoparticle ; Methanol electro-oxidation
• 刊名：Electrochimica Acta
• 出版年：2015
• 出版时间：1 October 2015
• 年：2015
• 卷：178
• 期：Complete
• 页码：74-79
• 全文大小：1296 K

文摘

Pt/TiO₂ nanofibers (Pt/T-NFs) composite catalysts are prepared through the combination of an electrospinning technique with a reductive impregnation method. Obtained samples are analyzed by various techniques, such as transmission electron microscopy and X-ray diffraction, which reveal that 21 wt.% Pt/T-NFs sample has a homogeneous distribution of smaller Pt nanoparticles of about 4.5 nm in size on the TiO₂ nanofibers surface without large aggregations. Electrochemical studies are carried out using cyclic voltammetry, chronoamperometry and CO stripping voltammetry, which indicate that 21 wt.% Pt/T-NFs catalyst has higher electrochemical surface area and much better activity for methanol electro-oxidation. All Pt/T-NFs catalysts have enhanced stability and CO tolerance for methanol electro-oxidation than commercial Pt/C. The results suggest that Pt/TiO₂ nanofibers catalysts exhibit the better activity for methanol oxidation and are favorable for improving the tolerance to poisoning species.