Artigo de peri??dico
Effect of Sn loading on the characteristics of Pt electrocatalysts supported on reduced graphene oxide for application as direct ethanol fuel cell anode
Registro en:
1452-3981
12
10.20964/2017.05.68
23.214
Autor
CORDEIRO, GUILHERME L.
USSUI, VALTER
MESSIAS, NILDEMAR A.
PIASENTIN, RICARDO M.
LIMA, NELSON B. de
NETO, ALMIR O.
LAZAR, DOLORES R.R.
Resumen
The effect of Sn loading (5???30 mol %) on Pt catalysts supported on reduced graphene oxide was investigated for ethanol electro-oxidation in acidic medium. Reduced graphene oxide was synthesized via graphite oxidation???exfoliation process in liquid phase and chemical reduction. Pt and PtxSny catalysts were deposited on reduced graphene oxide by a NaBH4 impregnation???reduction method. The adopted procedures allowed the synthesis of graphene-like nanosheets where single Sn-doped Pt nanoparticles were impregnated. Pt lattice parameter and micro-strain increased with Sn addition, confirming the formation of a solid solution. Concerning ethanol electro-oxidation, Pt was more active when supported on reduced graphene oxide whereas the introduction of Sn enhanced the catalyst activity, leading to lower ethanol oxidation potentials and higher current densities.