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원자제어 저차원 전자계 연구단
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Determining the Facile Routes for Oxygen Evolution Reaction by in Situ Probing of Li-O2 Cells with Conformal Li2O2 Films

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Title
Determining the Facile Routes for Oxygen Evolution Reaction by in Situ Probing of Li-O2 Cells with Conformal Li2O2 Films
Author(s)
Misun Hong; Chunzhen Yang; Raymond A. Wong; Aiko Nakao; Hee Cheul Choi; Hye Ryung Byon
Publication Date
2018-05
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.140, no.20, pp.6190 - 6193
Publisher
AMER CHEMICAL SOC
Abstract
An ongoing challenge with lithium-oxygen (Li-O2) batteries is in deciphering the oxygen evolution reaction (OER) process related to the slow decomposition of the insulating lithium peroxide (Li2O2). Herein, we shed light on the behavior of Li2O2 oxidation by exploiting various in situ imaging, gas analysis, and electrochemical methods. At the low potentials 3.2-3.7 V (vs Li/Li+), OER is exclusive to the thinner parts of the Li2O2 deposits, which leads to O2 gas evolution, followed by the concomitant release of superoxide species. At higher potentials, OER initiates at the sidewalls of the thicker Li2O2. The succeeding lateral decomposition of Li2O2 indicates the preferential Li+ and charge transport occurring at the sidewalls of Li2O2. To ameliorate the OER rate, we also investigate an alternative approach of rerouting charge carriers by using soluble redox mediators. Our in situ probes provide insights into the favorable charge-transport routes that can aid in promoting Li2O2 decomposition. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4528
ISSN
0002-7863
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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JACS_(최희철 교신)Determining the Facile Routes for Oxygen Evolution Reaction by In Situ Probing of Li–O2 Cells with Conformal Li2O2 Films.pdfDownload

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