Highly active and stable Pt electrocatalysts promoted by antimony-doped SnO₂ supports for oxygen reduction reactions

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• 作者：Min Yin ; Junyuan Xu ; Qingfeng Li ; Jens Oluf Jensen ; Yunjie Huang ; Lars N. Cleemann ; Niels J. Bjerrum ; Wei Xing
• 关键词：Platinum ; Antimony doped tin oxides ; Support ; Oxygen reduction reactions ; Fuel cells
• 刊名：Applied Catalysis B: Environmental
• 出版年：2014
• 出版时间：January, 2014
• 年：2014
• 卷：144
• 期：Complete
• 页码：112-120
• 全文大小：3896 K

文摘

Alternative composite supports for platinum catalysts were synthesized from antimony doped tin dioxide (ATO) nanoparticles. In the range of the antimony content from 0 to 11 mol % , the highest electrical conductivity of 1.1 S cm^?1 at 130 ¡ãC was obtained for the 5 mol % Sb ATO, from which composite supports composed of oxides and carbon and supported platinum catalysts were prepared. Using the pure oxide support, the Pt/ATO catalyst displayed superior specific activity and stability for the oxygen reduction reactions (ORRs). Low surface area of ATO caused poor dispersion of Pt particles compared to composite supports, which limited the mass activity of the supported catalysts. When the ATO composites were used as supports, the Pt/C-ATO catalysts showed significantly enhanced catalytic activity and durability for the ORR, attributable to the high ECSA and modified electronic structure of Pt by the ATO phase in the catalyst support.