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Oxygen Reduction on Methanol-Tolerant Carbon-Supported PtxSy Nanoparticles Prepared by a Single-Step Low-Temperature Method

  • Emilia A. CarbonioEmail author
  • Ubirajara P. Rodrigues-Filho
  • Alexandre Mesquita
  • Richard Landers
  • Ernesto R. Gonzalez
Original Research
  • 17 Downloads

Abstract

In direct methanol fuel cells (DMFCs), the methanol crossover from the anode to the cathode is a major cause of power density loss because of the overpotential arising due to the parasitic reaction of methanol oxidation at the cathode. Catalysts modified with S have shown better methanol tolerance; however, the preparation routes often require high temperatures or pressures and very long times, making these expensive and unlikely to be used in large scale. Here, we report on a single-step low-temperature method used to prepare a carbon-supported PtxSy catalyst. Moreover, we show that the catalyst shows lower depolarization in the presence of methanol and study the effect of reductive thermal treatment and electrochemical potential cycling.

Graphical Abstract

Keywords

Oxygen reduction reaction Methanol tolerance DMFC PtxSy nanoparticles 

Notes

Acknowledgments

The authors would like to acknowledge Fundação de Amparo à Pesquisa—FAPESP—and Conselho Nacional de Desenvolvimento Cientıiífico e Tecnoloógico—CNPq—for the financial assistance. EAC thanks CNPq for the fellowship grant (Proc.142095/2007-9).

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Authors and Affiliations

  1. 1.Grupo de Eletroquímica, Instituto de Química de São CarlosUniversidade de São PauloSão CarlosBrazil
  2. 2.Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, BESSY IIBerlinGermany
  3. 3.Grupo de Química de Materiais Híbridos e Inorgânicos, Instituto de Química de São CarlosUniversidade de São PauloSão CarlosBrazil
  4. 4.Instituto de Geociências e Ciências ExatasUniversidade Estadual PaulistaRio ClaroBrazil
  5. 5.Instituto de Física ‘Gleb Wataghin’Universidade Estadual de CampinasCampinasBrazil

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