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Joo, Sang Hoon
Nanomaterials & Catalysis Lab
Research Interests
  • Catalyst, energy conversion, fuel cells, electrolyzer, ORR, HER, OER

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Intrinsic relationship between enhanced oxygen reduction reaction activity and nanoscale work function of doped carbons

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Title
Intrinsic relationship between enhanced oxygen reduction reaction activity and nanoscale work function of doped carbons
Author
Cheon, Jae YeongKim, Jong HunKim, Jae HyungGoddeti, Kalyan C.Park, Jeong YoungJoo, Sang Hoon
Issue Date
2014-06
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.136, no.25, pp.8875 - 8878
Abstract
Nanostructured carbon materials doped with a variety of heteroatoms have shown promising electrocatalytic activity in the oxygen reduction reaction (ORR). However, understanding of the working principles that underpin the superior ORR activity observed with doped nanocarbons is still limited to predictions based on theoretical calculations. Herein, we demonstrate, for the first time, that the enhanced ORR activity in doped nanocarbons can be correlated with the variation in their nanoscale work function. A series of doped ordered mesoporous carbons (OMCs) were prepared using N, S, and O as dopants; the triple-doped, N,S,O-OMC displayed superior ORR activity and four-electron selectivity compared to the dual-doped (N,O-OMC and S,O-OMC) and the monodoped (O-OMC) OMCs. Significantly, the work functions of these heteroatom-doped OMCs, measured by Kelvin probe force microscopy, display a strong correlation with the activity and reaction kinetics for the ORR. This unprecedented experimental insight can be used to provide an explanation for the enhanced ORR activity of heteroatom-doped carbon materials.
URI
https://scholarworks.unist.ac.kr/handle/201301/5202
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84903281060
DOI
10.1021/ja503557x
ISSN
0002-7863
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CHM_Journal Papers
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