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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
de Carmargo, V. F. [1] ; Fontes, E. H. [1] ; Nandenha, J. [1] ; de Souza, R. F. B. [1] ; Neto, A. O. [1]
Total Authors: 5
Affiliation:
[1] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, Ave Prof Lineu Prestes 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: RESEARCH ON CHEMICAL INTERMEDIATES; v. 46, n. 2, p. 1555-1570, FEB 2020.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
Grantee:Julio Romano Meneghini
Support Opportunities: Research Grants - Research Centers in Engineering Program
FAPESP's process: 17/11937-4 - A sustainable path to methane conversion by advanced electrochemical technologies
Grantee:Fabio Coral Fonseca
Support Opportunities: Research Grants - Research Centers in Engineering Program
FAPESP's process: 14/09087-4 - Studies on the use of bioethanol in proton exchange membrane and solid oxide fuel cells
Grantee:Marcelo Linardi
Support Opportunities: Research Projects - Thematic Grants