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High performance Pt–Nb2O5/C electrocatalysts for methanol electrooxidation in acidic media

Paper ID Volume ID Publish Year Pages File Format Full-Text
47033 46456 2010 6 PDF Available
Title
High performance Pt–Nb2O5/C electrocatalysts for methanol electrooxidation in acidic media
Abstract

Nb2O5 incorporated Vulcan carbon XC-72R is prepared by solid-state reaction under intermittent microwave heating (IMH) method and the Pt nanoparticles were dispersed by microwave-assisted polyol process. The electrocatalyst samples were characterized by PXRD, TEM, XPS and the performance for methanol electrooxidation was studied in 0.5 mol L−1 H2SO4 aqueous solutions by cyclic voltammetry, chronopotentiometry and chronoamperometry. The physicochemical characterization reveals that Nb2O5 and Pt nanoparticles were evenly deposited on Vulcan carbon XC-72R. Electrochemical experiments showed that methanol electrooxidation performance is dependent on the amount of Nb2O5 loading and the peak current densities of methanol electrooxidation is significantly higher (∼80%) on Pt–Nb2O5(2:2)/C than Pt–Ru(2:1)/C. Furthermore, Pt–Nb2O5(2:2)/C electrocatalyst exhibited slower current decay with time than Pt–Ru(2:1)/C, suggesting good tolerance behavior towards CO-like intermediates. The enhanced electrode response is attributed to the synergistic effect between Pt and Nb2O5. This work shows that Pt–Nb2O5/C is a promising anode catalyst for direct methanol fuel cells in terms of its activity and stability towards methanol electrooxidation.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ IMH is a quicker method to develop oxide-supported Pt electrocatalysts. ▶ Addition of Nb2O5 to Pt enhances electrooxidation activity of methanol. ▶ Nb2O5 reduces the CO poisoning and increases the stability of Pt/C electrocatalyst. ▶ Pt–Nb2O5/C electrocatalysts are excellent anode materials for DMFCs.

Keywords
Pt–Nb2O5; Methanol oxidation; Electrocatalysis; Electrooxidation; Direct methanol fuel cell
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High performance Pt–Nb2O5/C electrocatalysts for methanol electrooxidation in acidic media
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 100, Issues 3–4, 20 October 2010, Pages 510–515
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