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

Min Yin, Junyuan Xu, Qingfeng Li, Jens Oluf Jensen, Yunjie Huang, Lars Nilausen Cleemann, Niels J. Bjerrum, Wei Xing

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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 11mol%, the highest electrical conductivity of 1.1Scm-1 at 130°C was obtained for the 5mol% 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. © 2013.

Original languageEnglish
JournalApplied Catalysis B: Environmental
Volume144
Pages (from-to)112-120
ISSN0926-3373
DOIs
Publication statusPublished - 2014

Keywords

  • Catalyst activity
  • Catalyst supports
  • Electrocatalysts
  • Electrolytic reduction
  • Electronic structure
  • Fuel cells
  • Nanocomposites
  • Supports
  • Synthesis (chemical)
  • Tin
  • Platinum

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