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Nanocomposite of N-Doped TiO2 Nanorods and Graphene as an Effective Electrocatalyst for the Oxygen Reduction Reaction

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School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui 230601, P. R. China
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506, United States
*E-mail: [email protected]. Fax: +86-0551-63861475.
*E-mail: [email protected]. Fax: +86-0551-63861475.
Cite this: ACS Appl. Mater. Interfaces 2014, 6, 24, 21978–21985
Publication Date (Web):November 18, 2014
https://doi.org/10.1021/am507890h
Copyright © 2014 American Chemical Society
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Abstract

Developing an effective electrocatalyst for the oxygen reduction reaction is a momentous issue in fuel cells. In this paper, we successfully synthesized the N-doped TiO2 nanorods/graphene (N-TiO2/NG) nanocomposite, which comprise the N-doped TiO2 (N-TiO2) nanorods (40–60 nm diameter and 90–300 nm length) and self-assembled nitrogen-doped graphene (NG) networks. We found that the nanocomposite exhibits great oxygen reduction reaction (ORR) electrocatalytic performance and also shows long durability and methanol tolerance than that of the commercial 20% Pt/C catalyst. This new nanocomposite may also have potential applications in other fields, which are related to energy storage, gas sensors, photocatalysis, and so on.

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EDX results of N-TiO2/NG-0.4. SEM images of NG, N-TiO2/NG-0.2, and N-TiO2/NG-0.6. XPS survey of the N-TiO2/NG-0.4. ORR polarization curves for NG, N-TiO2/NG-0.2, N-TiO2/NG-0.6, and commercial Pt/C catalysts recorded in an O2-saturated 0.1 M KOH at the different rotation rate. K-L plots for NG, N-TiO2/NG-0.2, N-TiO2/NG-0.6, and commercial Pt/C at different potentials. RRDE test of the ORR on NG, N-TiO2/NG-0.2, and N-TiO2/NG-0.6 in an O2-saturated 0.1 M KOH (1600 rpm). This material is available free of charge via the Internet at http://pubs.acs.org.

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