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Improved Pd electro-catalysis for oxygen reduction reaction in direct methanol fuel cell by reduced graphene oxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
45393 46410 2014 7 PDF Available
Title
Improved Pd electro-catalysis for oxygen reduction reaction in direct methanol fuel cell by reduced graphene oxide
Abstract

•Reduced graphene oxide (rGO) is used as a support for Pt and Pd.•Pd-nanobar and Pt-nanoparticle-supported catalysts are prepared by polyol method.•Pd nano-catalyst presents an enhanced performance when is supported on rGO.•Pt catalysts were found being more active when placed on C.

Noble metallic nano-catalysts supported on carbon based substrates are extensively used as electrodes for direct methanol fuel cells (DMFCs). Pd is a promising alternative to the more expensive Pt whether its catalytic properties should be improved. To this aim, reduced graphene oxide (rGO) was employed in this study as an alternative to conventional carbon black (C) substrates to improve the catalytic properties of Pd. Pd nanobars and Pt nanoparticles were synthesized, by the polyol method, and deposited for comparison both on commercial carbon and rGO. The oxygen reduction reactions (ORRs) at the fabricated electrodes were tested by the Rotating Disk Electrode (RDE) technique in acidic media. To correlate the activity to other physico-chemical properties, the nano-catalysts were characterized by Thermo Gravimetric Analysis (TGA), X-Ray Diffraction (XRD), and Transmission Electron Microscopy (TEM). The electro-catalytic activity of the electrode is importantly affected by the support chosen. Specifically, the Pd nano-catalyst proved an enhanced performance when on rGO, while the Pt counterpart was found being more active when placed on C. This result can be explained with a strong dependence of the ORR on the interaction between the metal nano-catalyst and the carbon based support.

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Keywords
Pd nanobars; Pt nanoparticles; Reduced graphene oxide; Oxygen reduction reaction
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Improved Pd electro-catalysis for oxygen reduction reaction in direct methanol fuel cell by reduced graphene oxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 554–560
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