Sharp kinetic acceleration potentials during mediated redox catalysis of insulators

Cao D, Shen X, Wang A, Yu F, Wu Y, Shi S, Freunberger SA, Chen Y. Sharp kinetic acceleration potentials during mediated redox catalysis of insulators. Research Square, 10.21203/rs.3.rs-750965/v1.

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Preprint | Submitted | English
Author
Cao, Deqing; Shen, Xiaoxiao; Wang, Aiping; Yu, Fengjiao; Wu, Yuping; Shi, Siqi; Freunberger, Stefan AlexanderIST Austria ; Chen, Yuhui
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Abstract
Redox mediators could catalyse otherwise slow and energy-inefficient cycling of Li-S and Li-O 2 batteries by shuttling electrons/holes between the electrode and the solid insulating storage materials. For mediators to work efficiently they need to oxidize the solid with fast kinetics yet the lowest possible overpotential. Here, we found that when the redox potentials of mediators are tuned via, e.g., Li + concentration in the electrolyte, they exhibit distinct threshold potentials, where the kinetics accelerate several-fold within a range as small as 10 mV. This phenomenon is independent of types of mediators and electrolyte. The acceleration originates from the overpotentials required to activate fast Li + /e – extraction and the following chemical step at specific abundant surface facets. Efficient redox catalysis at insulating solids requires therefore carefully considering the surface conditions of the storage materials and electrolyte-dependent redox potentials, which may be tuned by salt concentrations or solvents.
Publishing Year
Date Published
2021-08-18
Journal Title
Research Square
Acknowledgement
This work was financially supported by the National Natural Science Foundation of China (51773092, 21975124, 11874254, 51802187, U2030206). S.A.F. is indebted to IST Austria for support.
IST-REx-ID

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Cao D, Shen X, Wang A, et al. Sharp kinetic acceleration potentials during mediated redox catalysis of insulators. Research Square. doi:10.21203/rs.3.rs-750965/v1
Cao, D., Shen, X., Wang, A., Yu, F., Wu, Y., Shi, S., … Chen, Y. (n.d.). Sharp kinetic acceleration potentials during mediated redox catalysis of insulators. Research Square. https://doi.org/10.21203/rs.3.rs-750965/v1
Cao, Deqing, Xiaoxiao Shen, Aiping Wang, Fengjiao Yu, Yuping Wu, Siqi Shi, Stefan Alexander Freunberger, and Yuhui Chen. “Sharp Kinetic Acceleration Potentials during Mediated Redox Catalysis of Insulators.” Research Square, n.d. https://doi.org/10.21203/rs.3.rs-750965/v1.
D. Cao et al., “Sharp kinetic acceleration potentials during mediated redox catalysis of insulators,” Research Square. .
Cao D, Shen X, Wang A, Yu F, Wu Y, Shi S, Freunberger SA, Chen Y. Sharp kinetic acceleration potentials during mediated redox catalysis of insulators. Research Square, 10.21203/rs.3.rs-750965/v1.
Cao, Deqing, et al. “Sharp Kinetic Acceleration Potentials during Mediated Redox Catalysis of Insulators.” Research Square, doi:10.21203/rs.3.rs-750965/v1.
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2021-08-31
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