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

• Autor(a) principal: Carbonio, Emilia A.
• Data de Publicação: 2019
• Outros Autores: Rodrigues-Filho, Ubirajara P., Mesquita, Alexandre [UNESP], Landers, Richard, Gonzalez, Ernesto R.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1007/s12678-019-00522-9; http://hdl.handle.net/11449/197309
• topic: Oxygen reduction reaction; Methanol tolerance; DMFC; PtxSy nanoparticles

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.