Ethyl Viologen as a Superoxide Quencher to Enhance the Oxygen Reduction Reaction in Li–O2 Batteries

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Ethyl Viologen as a Superoxide Quencher to Enhance the Oxygen Reduction Reaction in Li–O2 Batteries
Title:
Ethyl Viologen as a Superoxide Quencher to Enhance the Oxygen Reduction Reaction in Li–O2 Batteries
Journal Title:
ACS Applied Energy Materials
Keywords:
Publication Date:
06 July 2022
Citation:
Wu, S., Yang, J., Qin, N., Li, Y., Wang, H., Zhang, Y.-W., Wang, Q., & Lu, Z. (2022). Ethyl Viologen as a Superoxide Quencher to Enhance the Oxygen Reduction Reaction in Li–O2 Batteries. ACS Applied Energy Materials, 5(7), 9040–9048. https://doi.org/10.1021/acsaem.2c01501
Abstract:
LiO2 is a critical intermediate of oxygen reduction reaction (ORR) in nonaqueous Li-O2 battery that largely determines the discharge capacity and cycling stability. Currently, bifunctional redox mediators that can promote solution reaction route by enhancing the solvation of LiO2 have attracted tremendous interests in a bid to increase the attainable capacity. However, the prolonged lifetime of LiO2 may cause instability of the battery system. Conversely, redox mediators that quench LiO2 and facilitate surface reaction route receives little attention. Here, we provide in-depth exploration of the catalytic pathway and effect of a bifunctional superoxide quencher that facilitates the surface growth of Li2O2. Surprisingly, the predominant surface reaction route by EV helps deliver a capacity as much as that facilitated by solution reaction route. The findings of this work provide a new direction of screening and evaluating functioning redox mediators for Li-O2 batteries.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP24-2020-0002

This research / project is supported by the National Research Foundation - Investigatorship Award
Grant Reference no. : NRF-NRFI2018-06

This research / project is supported by the A*STAR - Central Research Fund
Grant Reference no. : NA
Description:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Energy Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see doi.org/10.1021/acsaem.2c01501
ISSN:
2574-0962
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