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Graphitic Carbon as Durable Cathode-Catalyst Support for PEFCs

Selvaganesh, Vinod S and Selvarani, G and Sridhar, P and Pitchumani, S and Shukla, AK (2011) Graphitic Carbon as Durable Cathode-Catalyst Support for PEFCs. In: Fuel Cells, 11 (3). pp. 372-384.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/fuce.20...


Long-term deterioration in the performance of PEFCs is attributed largely to reduction in active area of the platinum catalyst at cathode, usually caused by carbon-support corrosion. It is found that the use of graphitic carbon as cathode-catalyst support enhances its long-term stability in relation to non-graphitic carbon. This is because graphitic-carbon-supported- Pt (Pt/GrC) cathodes exhibit higher resistance to carbon corrosion in-relation to non-graphitic-carbon-supported- Pt (Pt/Non-GrC) cathodes in PEFCs during accelerated stress test (AST) as evidenced by chronoamperometry and carbon dioxide studies. The corresponding change in electrochemical surface area (ESA), cell performance and charge-transfer resistance are monitored through cyclic voltammetry (CV), cell polarisation and impedance measurements, respectively. The degradation in performance of PEFC with Pt/GrC cathode is found to be around 10% after 70 h of AST as against 77% for Pt/Non-GrC cathode. It is noteworthy that Pt/GrC cathodes can withstand even up to 100 h of AST with nominal effect on their performance. Xray diffraction (XRD), Raman spectroscopy, transmission electron microscopy and cross-sectional field-emission scanning electron microscopy (FE-SEM) studies before and after AST suggest lesser deformation in catalyst layer and catalyst particles for Pt/GrC cathodes in relation to Pt/Non-GrC cathodes, reflecting that graphitic carbon-support resists carbon corrosion and helps mitigating aggregation of Pt-particles.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley & Sons.
Keywords: Accelerated Stress Test;Carbon Corrosion;Cathode Catalyst; Degradation;Electrochemical Surface Area;Membrane Electrode Assembly
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 29 Jun 2011 09:12
Last Modified: 29 Jun 2011 09:12
URI: http://eprints.iisc.ac.in/id/eprint/38633

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