Bifunctionally Electrocatalytic Bromine Redox Reaction by Single-Atom Catalysts for High-Performance Zinc Batteries.

Autor: Chen S; Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China., Peng C; Multiscale Crystal Materials Research Center, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, P. R. China., Zhu D; Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, P. R. China., Zhi C; Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China.; Centre for Functional Photonics, City University of Hong Kong, Kowloon, Hong Kong, 999077, P. R. China.; Hong Kong Institute for Advanced Study, City University of Hong Kong, Kowloon, Hong Kong, 999077, P. R. China.; Centre for Advanced Nuclear Safety and Sustainable Development, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 Sep 27, pp. e2409810. Date of Electronic Publication: 2024 Sep 27.
DOI: 10.1002/adma.202409810
Abstrakt: Aqueous zinc-bromine (Zn||Br 2 ) batteries are regarded as one of the most promising energy storage devices due to their high safety, theoretical energy density, and low cost. However, the sluggish bromine redox kinetics and the formation of a soluble tribromide (Br 3 - ) hinder their practical applications. Here, it is proposed dispersed single iron atom coordinated with nitrogen atoms (FeN 5 ) in a mesoporous carbon framework (FeSAC-CMK) as a conductive catalytic bromine host, which possesses porous structure and electrocatalytic functionality of FeN 5 species for enhanced confinement and electrocatalytic effect. The active FeN 5 species can fix the bromine (Br 0 ) species to suppress the formation of Br 3 - effectively and bifunctionally catalyze the bromide (Br - )/Br° conversion. These free up 1/3 Br - locked by Br 3 - complexing agent for enhanced bromine utilization efficiency and conversion reversibility. Accordingly, the Zn||Br 2 battery with FeSAC-CMK delivers an impressive specific capacity of 344 mAh g -1 at 0.2 A g -1 and superior rate capability with 164 mAh g -1 achieved even at 20 A g -1 , much higher than that of inactive CMK (262 mAh g -1 at 0.2 A g -1 ; 6 mAh g -1 at only 8 A g -1 ). Furthermore, the battery demonstrates excellent cycling performance of 88% capacity retention after 2000 cycles.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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