Characterization and performance evaluation of Pt-Ru electrocatalysts supported on different carbon materials for direct methanol fuel cells
authors Salgado, JRC; Paganin, VA; Gonzalez, ER; Montemor, MF; Tacchini, I; Anson, A; Salvador, MA; Ferreira, P; Figueiredo, FML; Ferreira, MGS
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Pt-Ru electrocatalyst; Mesoporous carbon (CMK-3); Oxygenated groups; TiO2; Methanol oxidation; DMFC
keywords PARTICLE-SIZE; FUNCTIONALIZED CARBON; CATALYST SUPPORT; XRD ANALYSIS; OXIDATION; ALLOYS; ELECTROOXIDATION; PLATINUM; ACID
abstract The paper addresses the effect of the carbon support on the microstructure and performance of Pt-Ru-based anodes for direct methanol fuel cells (DMFC), based on the study of four electrodes with a carbon black functionalized with HNO3, a mesoporous carbon (CMK-3), a physical mixture of TiO2 and carbon black and a reference carbon thermally treated in helium atmosphere (HeTT). It is shown that CMK-3 hinders the growth of the electrocatalyst nanoparticles (2.7 nm) and improves their distribution on the support surface, whereas the oxidized surfaces of HNO3 carbon and TiO2+carbon lead to larger (4-4.5 nm), agglomerated particles, and the lowest electrochemical active areas (54 and 26 m(2) g(-1), in contrast with 90 m(2) g(-1) for CMK-3), as determined from CO stripping experiments. However, HNO3 and TiO2 are characterized by the lowest CO oxidation potential (0.4 V vs. RHE), thus suggesting higher CO tolerance for the se electrodes. Tests in DMFC configuration show that the three modified electrodes have clearly better performance than the reference HeTT. The highest power density attained with electrodes supported on carbon treated with HNO3 (65 mW cm(-2)/300 mA cm(-2) at 90 degrees C) and the equally interesting performance of the TiO2-based electrodes (53 mW cm(-2)/300 mA cm(-2)), is a strong indication of the positive effect of the presence of oxygenated groups on the methanol oxidation reaction. The results are interpreted in order to identify separate microstructural (electrocatalyst particle size, porosity) and compositional (oxygenated surface groups, presence of oxide phase) effects on the electrode performance. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2013
volume 38
issue 2
beginning page 910
ending page 920
digital object identifier (doi) 10.1016/j.ijhydene.2012.10.079
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000315001700020
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journal analysis (jcr 2017):
journal impact factor 4.229
5 year journal impact factor 4.064
category normalized journal impact factor percentile 73.585
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