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Issue 39, 2012
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Bifunctional effect of reduced graphene oxides to support active metal nanoparticles for oxygen reduction reaction and stability

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Abstract

Highly active and stable Pt/reduced graphene oxide (RGO) electrocatalysts for the application of proton exchange membrane fuel cells were developed by tuning the O/C atom ratio of RGO supports. The results showed that Pt nanoparticles with a narrow distribution of particle sizes were well dispersed on RGO, and an increased conductivity and stability of RGO were achieved when the Pt/RGO was deoxidized with an increased graphitization degree of RGO during hydrogen reduction. The highest activity of oxygen reduction reaction (ORR) and stability of Pt/RGO was obtained by hydrogen heat treatment Pt/RGO for 1 hour, in which the O/C atom ratio was 0.14. However, with increment of the reaction time, the atom ratio of O/C decreased to 0.11, the performance dropped sharply due to the further removal of the oxygenated groups on RGO, resulting in a serious aggregation of Pt nanoparticles. This study strongly suggested a bifunctional effect of both graphitization and the oxygenated groups on the catalytic activity and stabilization of metal (such as Pt) nanoparticles on RGO. This will open a door to apply graphene in fuel cells and other fields.

Graphical abstract: Bifunctional effect of reduced graphene oxides to support active metal nanoparticles for oxygen reduction reaction and stability

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Publication details

The article was received on 03 Jul 2012, accepted on 23 Aug 2012 and first published on 24 Aug 2012


Article type: Paper
DOI: 10.1039/C2JM34290A
J. Mater. Chem., 2012,22, 21298-21304

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    Bifunctional effect of reduced graphene oxides to support active metal nanoparticles for oxygen reduction reaction and stability

    D. He, K. Cheng, T. Peng, X. Sun, M. Pan and S. Mu, J. Mater. Chem., 2012, 22, 21298
    DOI: 10.1039/C2JM34290A

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