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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM

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High-performance oxygen reduction and evolution carbon catalysis: From mechanistic studies to device integration

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Title
High-performance oxygen reduction and evolution carbon catalysis: From mechanistic studies to device integration
Author
To, John W.F.Ng, Jia Wei DesmondSiahrostami, SamiraKoh, Ai LeenLee, YangjinChen, ZhihuaFong, Karan D.Chen, ShuchengHe, JiajunBae, Won-GyuWilcox, JenniferJeong, Hu YoungKim, KwanpyoStudt, FelixNørskov, Jens K.Jaramillo, Thomas F.Bao, Zhenan
Keywords
electrocatalysis; porous carbon; density functional theory
Issue Date
201704
Publisher
TSINGHUA UNIV PRESS
Citation
NANO RESEARCH, v.10, no.4, pp.1163 - 1177
Abstract
The development of high-performance and low-cost oxygen reduction and evolution catalysts that can be easily integrated into existing devices is crucial for the wide deployment of energy storage systems that utilize O2-H2O chemistries, such as regenerative fuel cells and metal-air batteries. Herein, we report an NH3-activated N-doped hierarchical carbon (NHC) catalyst synthesized via a scalable route, and demonstrate its device integration. The NHC catalyst exhibited good performance for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), as demonstrated by means of electrochemical studies and evaluation when integrated into the oxygen electrode of a regenerative fuel cell. The activities observed for both the ORR and the OER were comparable to those achieved by state-of-the-art Pt and Ir catalysts in alkaline environments. We have further identified the critical role of carbon defects as active sites for electrochemical activity through density functional theory calculations and high-resolution TEM visualization. This work highlights the potential of NHC to replace commercial precious metals in regenerative fuel cells and possibly metal-air batteries for cost-effective storage of intermittent renewable energy.
URI
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DOI
http://dx.doi.org/10.1007/s12274-016-1347-8
ISSN
1998-0124
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