High Efficiency Alkaline Iodine Batteries with Multi-Electron Transfer Enabled by Bi/Bi 2 O 3 Redox Mediator.

Autor: Ma W; State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Joint International Research Laboratory of Energy Electrochemistry, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China., Li J; State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Joint International Research Laboratory of Energy Electrochemistry, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China., Wang H; State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Joint International Research Laboratory of Energy Electrochemistry, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China., Lei C; State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Joint International Research Laboratory of Energy Electrochemistry, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China., Liang X; State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Joint International Research Laboratory of Energy Electrochemistry, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Dec 20; Vol. 63 (52), pp. e202410994. Date of Electronic Publication: 2024 Nov 07.
DOI: 10.1002/anie.202410994
Abstrakt: The multi-electron transfer I - /IO 3 - redox couple is attractive for high energy aqueous batteries. Shifting from an acidic to an alkaline electrolyte significantly enhances the IO 3 - formation kinetics due to the spontaneous disproportionation reaction, while the alkaline environment also offers more favorable Zn anode compatibility. However, sluggish kinetics during the reduction of IO 3 - persists in both acidic and alkaline electrolytes, compromising the energy efficiency of this glorious redox couple. Here, we establish the fundamental redox mechanism of the I - /IO 3 - couple in alkaline electrolytes for the first time and propose that Bi/Bi 2 O 3 acts as a redox mediator (RM) to "catalyze" the reduction of IO 3 - . This mediation significantly reduces the voltage gap between charge/discharge from 1.6 V to 1 V with improved conversion efficiency and rate capability. By pairing the Zn anode and the Bi/Bi 2 O 3 RM cathode, the full battery with I - /IO 3 - redox mechanism achieves high areal capacity of 12 mAh cm -2 and stable operation at 5 mAh cm -2 for over 400 cycles.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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