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In Situ X-ray Absorption Spectroscopy of a Synergistic Co-Mn Oxide Catalyst for the Oxygen Reduction Reaction

Authors
유승호
Issue Date
1월-2019
Publisher
AMERICAN CHEMICAL SOCIETY SERVICE@ACS.ORG
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.141, no.4, pp.1463 - 1466
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume
141
Number
4
Start Page
1463
End Page
1466
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/139703
DOI
10.1021/jacs.8b12243
ISSN
0002-7863
Abstract
Identifying the catalytically active site(s) in the oxygen reduction reaction (ORR), under real-time electrochemical conditions, is critical to the development of fuel cells and other technologies. We have employed in situ synchrotron-based X-ray absorption spectroscopy (XAS) to investigate the synergistic interaction of a Co-Mn oxide catalyst which exhibits impressive ORR activity in alkaline fuel cells. X-ray absorption near edge structure (XANES) was used to track the dynamic structural changes of Co and Mn under both steady state (constant applied potential) and nonsteady state (potentiodynamic cyclic voltammetry, CV). Under steady state conditions, both Mn and Co valences decreased at lower potentials, indicating the conversion from Mn(III,IV) and Co(III) to Mn(II,III) and Co(II), respectively. Rapid X-ray data acquisition, combined with a slow sweep rate in CV, enabled a 3 mV resolution in the applied potential, approaching a nonsteady (potentiodynamic) state. Changes in the Co and Mn valence states were simultaneous and exhibited periodic patterns that tracked the cyclic potential sweeps. To the best of our knowledge, this represents the first study, using in situ XAS, to resolve the synergistic catalytic mechanism of a bimetallic oxide. Strategies developed/described here
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