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