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Enhanced oxygen reduction activity and durability of Pt catalysts supported on carbon nanofibers

Paper ID Volume ID Publish Year Pages File Format Full-Text
46429 46439 2012 7 PDF Available
Title
Enhanced oxygen reduction activity and durability of Pt catalysts supported on carbon nanofibers
Abstract

Carbon nanofibers (CNF) characterized by different mean diameter, BET surface area and graphicity were prepared and used as supports to enhance Pt dispersion in low temperature fuel cell catalyst. As a comparison, a conventional Pt on carbon black (Vulcan XC72R) catalyst was prepared using the same procedure. The most appropriate Pt dispersion was achieved for the carbon nanofiber support showing the best compromise in terms of BET surface area and graphicity. This catalyst shows enhanced electrochemical active surface area (ECSA) and performance for the oxygen reduction reaction (ORR) with respect to the Pt/Vulcan catalyst. A cross-analysis of the supports physical-chemical properties, ECSA and mass activity for the ORR suggests that both Pt dispersion and electronic properties as determined by the effect of surface groups and graphicity play a significant role in determining the electrocatalytic activity. Whereas, regarding the decay associated to the corrosion in accelerated degradation tests (ADT), two mitigation effects are envisaged, anchoring effect of surface groups stabilizes Pt nanoparticles with respect to dissolution, whereas a high surface graphicity index reduces carbon corrosion which acts as support for the Pt particles.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Crystallinity, porosity and morphology of various CNF affect the catalytic behavior. ► Using CNF as support enhances the performance with respect to conventional support. ► Maximum mass activity is achieved by a certain proper combination of properties. ► The high graphicity index of CNF reduces carbon corrosion at elevated potential.

Keywords
Pt catalyst; Carbon nanofibers; Fuel cell; Oxygen reduction; Durability
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Enhanced oxygen reduction activity and durability of Pt catalysts supported on carbon nanofibers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 115–116, 5 April 2012, Pages 269–275
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us