High activity of Pt-Rh supported on C-ITO for ethanol oxidation in alkaline medium

Autor(es)

de Carmargo, V. F. ^[1] ; Fontes, E. H. ^[1] ; Nandenha, J. ^[1] ; de Souza, R. F. B. ^[1] ; Neto, A. O. ^[1]

Afiliação do(s) autor(es)

^[1] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, Ave Prof Lineu Prestes 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RESEARCH ON CHEMICAL INTERMEDIATES; v. 46, n. 2, p. 1555-1570, FEB 2020.
• Citações Web of Science: 0

Resumo

PtRh/C-ITO electrocatalysts were prepared in a single-step method using H(2)PtCl(6)6H(2)O and RhCl(3)xH(2)O as metal sources, sodium borohydride as the reducing agent and a physical mixture of 85% Vulcan Carbon XC72 and 15% In2O3SnO2 (indium tin oxide-ITO) as support. PtRh/C-ITO were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), cyclic voltammetry, chronoamperommetry, attenuated total reflectance, Fourier transform infrared spectroscopy and performance test on direct alkaline ethanol fuel cell. X-ray diffraction patterns for all PtRh/C-ITO indicated a shift in Pt (fcc) peaks, showing that Rh was incorporated into Pt lattice. Transmission electron microscopy for PtRh/C-ITO showed nanoparticles homogeneously distributed over the support with particles size between 3.0 and 4.0 nm. The XPS results for Pt70Rh30/C-ITO showed the presence of mixed oxidation states of Sn-0 and SnO2 that could favor the oxidation of adsorbed intermediates by bifunctional mechanism. Pt90Rh10/C-ITO was more active in electrochemical studies, which could be associated with the C-C bond break. Experiments in direct alkaline ethanol fuel cells showed that the power density values obtained for Pt70Rh30/C-ITO and Pt90Rh10/C-ITO were higher than Pt/C, indicating the beneficial effect of Rh addition to Pt and the use of C-ITO support. (AU)

• Processo FAPESP: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 17/11937-4 - Rota sustentável para a conversão de metano com tecnologias eletroquímicas avançadas
• Beneficiário: Fabio Coral Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 14/09087-4 - Estudos sobre o uso do bioetanol em células a combustível do tipo PEMFC e SOFC
• Beneficiário: Marcelo Linardi
• Modalidade de apoio: Auxílio à Pesquisa - Temático