Artículos de revistas
Methanol Oxidation in Alkaline Medium Using PtIn/C Electrocatalysts
Fecha
2016-11-01Registro en:
Electrocatalysis. New York: Springer, v. 7, n. 6, p. 445-450, 2016.
1868-2529
10.1007/s12678-016-0324-z
WOS:000386490500002
WOS000386490500002.pdf
9620122455708223
0000-0003-4069-509X
Autor
IPEN CNEN SP
Universidade Estadual Paulista (Unesp)
Univ Fed Amazonas
Universidade Federal de São Carlos (UFSCar)
Institución
Resumen
Pt/C and PtIn/C with atomic ratios of 90:10, 70:30, and 50:50 were investigated for methanol electro-oxidation in alkaline media by using cyclic voltammetry (CV), chronoamperometry (CA), and direct methanol alkaline fuel cell (DMAFC). All electrocatalysts were synthesized using sodium borohydride method with 20 wt% of metals loading on carbon. X-ray diffraction (XRD) analysis revealed that bimetallic PtIn had faced centered cubic structure and, also, confirmed alloy formation for PtIn/C nanoparticles. Transmission electron micrographs showed metal nanoparticles with average particle size between 3.0 and 5.0 nm; however, the particle size increases when the In content was increased in PtIn/C. In the CV experiments, the onset potential of methanol electro-oxidation shifted to lower values as the indium content increased. Chronoamperometry experiments and direct methanol alkaline fuel cell suggested PtIn/C (70:30) as the most promising material for methanol electro-oxidation: this result could be explained by the presence of Pt and In in close contact (electronic effect) as the occurrence of oxy-hydroxy interactions.