Vinod Selvaganesh, S. and Selvarani, G. and Sridhar, P. and Pitchumani, S. and Shukla, A.K.
(2010)
A Durable PEFC with Carbon-Supported Pt–TiO2 Cathode: A
Cause and Effect Study.
Journal of the Electrochemical Society, 157 (7).
B1000-B1007.
ISSN 0013-4651
Abstract
Durability is central to the commercialization of polymer electrolyte fuel cells (PEFCs). The incorporation of TiO2 with platinum
(Pt) ameliorates both the stability and catalytic activity of cathodes in relation to pristine Pt cathodes currently being used in
PEFCs. PEFC cathodes comprising carbon-supported Pt–TiO2 (Pt–TiO2/C) exhibit higher durability in relation to Pt/C cathodes
as evidenced by cell polarization, impedance, and cyclic voltammetry data. The degradation in performance of the Pt–TiO2/C
cathodes is 10% after 5000 test cycles as against 28% for Pt/C cathodes. These data are in conformity with the electrochemical
surface area and impedance values. Pt–TiO2/C cathodes can withstand even 10,000 test cycles with nominal effect on their
performance. X-ray diffraction, transmission electron microscope, and cross-sectional field-emission-scanning electron microscope
studies on the catalytic electrodes reflect that incorporating TiO2 with Pt helps in mitigating the aggregation of Pt particles and
protects the Nafion membrane against peroxide radicals formed during the cathodic reduction of oxygen.
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