PtSn/C alloyed and non-alloyed materials: Differences in the ethanol electro-oxidation reaction pathways

Author(s)

Silva, J. C. M. ^{[1, 2]} ; Parreira, L. S. ^{[1, 2]} ; De Souza, R. F. B. ^{[1, 2]} ; Calegaro, M. L. ^{[2, 3]} ; Spinace, E. V. ^{[1, 2]} ; Neto, A. O. ^{[1, 2]} ; Santos, M. C. ^{[1, 2]}

Affiliation

^[1] Univ Fed Abc, CCNH, LEMN, BR-09210170 Santo Andre, SP - Brazil

^[2] CNEN SP, IPEN, BR-05508900 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Grp Mat Eletroquim & Metodos Eletroanalit, Inst Quim Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 110, p. 141-147, NOV 2 2011.
• Web of Science Citations: 52

Abstract

In the present work, the ethanol oxidation reaction (EOR) was investigated using PtSn/C electrocatalysts in the following two phases: 92% alloyed prepared by the polymeric precursor method (PPM) and 6% alloyed prepared by a sot-gel method (SGM). The TEM experiments show particle sizes of 3-5 nm for both catalysts. The electrocatalytic activity for both materials was investigated using chronoamperometry, and at 0.5 V vs. RHE, the current density for the EOR on the PPM material was approximately 5 times higher than on the SGM material. From in situ ATR-FTIR experiments, it can be seen that the non-alloyed materials led to CO(2) formation with slow kinetics, whereas alloyed materials led to acetic acid formation with fast kinetics. The enhancement in the electrocatalytic behavior for ethanol oxidation was explained by acetic acid formation. (C) 2011 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 09/09145-6 - Study of ethanol electrochemical oxidation mechanism on PtSn, PtCe and PtSnCe using in-situ spectroscopic techniques
• Grantee: Rodrigo Fernando Brambilla de Souza
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 10/16511-6 - Energy generation from biofuel using nanostructures
• Grantee: Mauro Coelho dos Santos
• Support Opportunities: Regular Research Grants
• FAPESP's process: 10/07831-7 - Synthesis and characterization of PtSn/C, PtIr/C and PtSnIr for the study of the mechanism of ethanol electrochemical oxidation using spectroscopic in situ techniques
• Grantee: Júlio César Martins da Silva
• Support Opportunities: Scholarships in Brazil - Doctorate