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나노입자 연구단
나노입자 연구단
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Design Principle of Fe-N-C Electrocatalysts: How to Optimize Multimodal Porous Structures?

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Title
Design Principle of Fe-N-C Electrocatalysts: How to Optimize Multimodal Porous Structures?
Author(s)
Soo Hong Lee; Jiheon Kim; Dong Young Chung; Ji Mun Yoo; Hyeon Seok Lee; Min Jeong Kim; Mun B.S.; Soon Gu Kwon; Yung-Eun Sung; Taeghwan Hyeon
Publication Date
2019-02
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.141, no.5, pp.2035 - 2045
Publisher
AMER CHEMICAL SOC
Abstract
The effect of porous structures on the electrocatalytic activity of N-doped carbon is studied by using electrochemical analysis techniques and the result is applied to synthesize highly active and stable Fe-N-C catalyst for oxygen reduction reaction (ORR). We developed synthetic procedures to prepare three types of N-doped carbon model catalysts that are designed for systematic comparison of the porous structures. The difference in their catalytic activity is investigated in relation to the surface area and the electrochemical parameters. We found that macro- and mesoporous structures contribute to different stages of the reaction kinetics. The catalytic activity is further enhanced by loading the optimized amount of Fe to prepare Fe-N-C catalyst. In both N-doped carbon and Fe-N-C catalysts, the hierarchical porous structure improved electrocatalytic performance in acidic and alkaline media. The optimized catalyst exhibits one of the best ORR performance in alkaline medium with excellent long-term stability in anion exchange membrane fuel cell and accelerated durability test. Our study establishes a basis for rationale design of the porous carbon structure for electrocatalytic applications. © 2019 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/6483
ISSN
0002-7863
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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