Manipulating Oxygen Vacancies by K+ Doping and Controlling Mn2+ Deposition to Boost Energy Storage in ß-MnO2.
ACS Appl Mater Interfaces
; 14(42): 47725-47736, 2022 Oct 26.
Article
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| MEDLINE
| ID: mdl-36251265
ABSTRACT
Aqueous zinc-ion batteries (ZIBs) have gained wide attention for their low cost, high safety, and environmental friendliness in recent years. ß-MnO2, a potential cathode material for ZIBs, has been restricted by its small channels for efficient charge storage. Herein, ß-MnO2 nanorods with oxygen vacancies are fabricated by a K+-doping strategy to improve the performance of ZIBs. The assembled batteries exhibit a capacity of 468 mAh g-1, a power density of 2605 W kg-1, and an energy density of 179 Wh kg-1, which outperforms most reported ZIBs. Such a performance is owing to the synergistic combination of the oxygen vacancies in ß-MnO2 and concurrent deposition of ε-MnO2 from Mn2+ in the electrolyte. Furthermore, superior cycling stability with negligible capacity decay in these batteries is demonstrated over 1000 cycles at a high current of 2 A g-1. This study reveals the importance of oxygen vacancies and Mn2+ deposition effect in understanding the mechanism of charge storage in MnO2-based ZIBs.
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Base de datos:
MEDLINE
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En
Revista:
ACS Appl Mater Interfaces
Asunto de la revista:
BIOTECNOLOGIA
/
ENGENHARIA BIOMEDICA
Año:
2022
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Article