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Issue 13, 2013
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Enhanced electrochemical oxygen reduction reaction by restacking of N-doped single graphene layers

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Abstract

Graphene, which is a two-dimensional layer structure of sp2-hybridized carbon, has been highlighted recently as a promising material for energy conversion. Herein, graphene-derived catalysts are developed for application in oxygen reduction reactions (ORRs) in acidic media via heat-treatment with dicyandiamide and a small amount (<1 wt.%) of transition metal. In ORRs, bare graphene exhibits 0.58 V (vs. RHE) of the onset potential; however, it increases to ∼0.9 V through modification steps and records a mass activity of 1.28 mA mg−1 at 0.75 V. Through the correlation curve between the ORR activities and the number of restacked graphene layers, it is proposed that the stacking of a few layers is desirable in the ORRs rather than a single layer catalyst. The graphene-derived catalysts exhibit graphite properties of facile electron transfer as the restacking of graphene layers increases, without degradation of the pyridinic-N on the graphene edge.

Graphical abstract: Enhanced electrochemical oxygen reduction reaction by restacking of N-doped single graphene layers

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Publication details

The article was received on 05 Dec 2012, accepted on 17 Jan 2013 and first published on 18 Jan 2013


Article type: Paper
DOI: 10.1039/C3RA23180A
RSC Adv., 2013,3, 4246-4253

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    Enhanced electrochemical oxygen reduction reaction by restacking of N-doped single graphene layers

    C. H. Choi, M. W. Chung, S. H. Park and S. I. Woo, RSC Adv., 2013, 3, 4246
    DOI: 10.1039/C3RA23180A

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