Edge-enriched graphene with boron and nitrogen co-doping for enhanced oxygen reduction reaction

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Carbon-based electrocatalysts for oxygen reduction reaction (ORR), especially in anion exchange membrane fuel cells (AEMFCs), have received a lot of attention because they exhibit excellent stability and are comparable to commercial Pt/C catalysts. Currently, to maximize the catalytic activity of carbon-based electrocatalysts, there are two major strategies: heteroatom doping or exposing active edge sites. However, the approach of increasing heteroatomic dopants of active edge sites has been rarely addressed. In this study, we present a simple strategy to prepare edge-enriched graphene catalysts with an increased ratio of heteroatomic dopants suitable for ORR of AEMFCs. The catalysts were prepared under harsh oxidation conditions, followed by a simple co-doping process with boron and nitrogen. The ORR activity of the catalysts was observed to be related to an increase of edge sites with heteroatomic dopants. We believe that the edge-enriched structure leads to accelerated electron transfer with enhanced oxygen adsorption.
Publisher
ELSEVIER
Issue Date
2020-03
Language
English
Article Type
Article
Citation

CURRENT APPLIED PHYSICS, v.20, no.3, pp.456 - 461

ISSN
1567-1739
DOI
10.1016/j.cap.2020.01.008
URI
http://hdl.handle.net/10203/272237
Appears in Collection
CBE-Journal Papers(저널논문)
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