Selvarani, G. and Maheswari, S. and Sridhar, P. and Pitchumani, S. and Shukla, A.K.
(2009)
Carbon-Supported Pt–TiO2 as a Methanol-Tolerant
Oxygen-Reduction Catalyst for DMFCs.
Journal of the Electrochemical Society, 156 (11).
pp. 1354-1360.
ISSN 0013-4651
Abstract
Carbon-supported Pt–TiO2 Pt–TiO2/C catalysts with varying at. wt ratios of Pt to Ti, namely, 1:1, 2:1, and 3:1, are prepared by
the sol–gel method. The electrocatalytic activity of the catalysts toward oxygen reduction reaction ORR, both in the presence and
absence of methanol, is evaluated for application in direct methanol fuel cells DMFCs. The optimum at. wt ratio of Pt to Ti in
Pt–TiO2/C is established by fuel cell polarization, linear sweep voltammetry, and cyclic voltammetry studies. Pt–TiO2/C heattreated
at 750°C with Pt and Ti in an at. wt ratio of 2:1 shows enhanced methanol tolerance, while maintaining high catalytic
activity toward ORR. The DMFC with a Pt–TiO2/C cathode catalyst exhibits an enhanced peak power density of 180 mW/cm2
in contrast to the 80 mW/cm2 achieved from the DMFC with carbon-supported Pt catalyst while operating under identical
conditions. Complementary data on the influence of TiO2 on the crystallinity of Pt, surface morphology, and particle size, surface
oxidation states of individual constituents, and bulk and surface compositions are also obtained by powder X-ray diffraction,
scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, energy dispersive analysis by X-ray, and
inductively coupled plasma optical emission spectrometry.
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