Journal of the Brazilian Chemical Society | |
Pt-Cu/C and Pd Modified Pt-Cu/C electrocatalysts for the oxygen reduction reaction in direct methanol fuel cells | |
Gonzalez, Ernesto R.1  Ciapina, Eduardo G.1  Universidade de São Paulo, São Carlos, Brazil1  Carbonio, Emilia A.1  Pereira, Maristela E.1  Colmati, Flavio1  | |
关键词: oxygen reduction reaction; electrocatalysis; DMFC; cathodes; | |
DOI : 10.1590/S0103-50532010000400003 | |
学科分类:化学(综合) | |
来源: SciELO | |
【 摘 要 】
In this work, different carbon supported Pt-Cu catalysts and Pd modified Pt-Cu catalysts were prepared by chemical reduction of Pt, Cu and Pd precursors with sodium borohydride, and their electrocatalytic activity for the oxygen reduction reaction was studied. X-ray diffraction analysis indicated alloy formation. Transmission electron microscopy (TEM) showed that the metal nanoparticles are well-distributed on the carbon support. Dispersive X-ray absorption spectroscopy (DXAS) was used to achieve a better understanding of the intrinsic properties of the materials. The electrocatalysts were characterized electrochemically by cyclic voltammetry in 0.5 mol L-1 H2SO4 and their electrochemical activity was studied with steady-state experiments in a direct methanol fuel cell (DMFC). The introduction of Pd led to an improvement of the catalytic activity of the Pt-Cu catalysts. The best performance in a DMFC was obtained using, as cathode, a Pt50Pd40Cu10/C alloy catalyst thermally treated at 500 ºC in an H2/Ar atmosphere.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912050580967ZK.pdf | 2480KB | download |