Engineering p-Band Center of Oxygen Boosting H+ Intercalation in δ-MnO2 for Aqueous Zinc Ion Batteries.
Angew Chem Int Ed Engl
; 62(8): e202215654, 2023 Feb 13.
Article
en En
| MEDLINE
| ID: mdl-36565058
ABSTRACT
In aqueous zinc ion batteries (ZIBs), the H+ intercalation possesses superior electrochemical kinetics with excellent rate capability, however, precisely modulating H+ intercalation has been still challenging. Herein, a critical modification of pre-intercalating metal ions in the MnO2 interlayer (M-MnO2 ) with controllable p-band center (ϵp ) of O is reported to modulate the H+ intercalation. The modulation of metal-O bond type and covalency degree on the average charge of O atom results in optimized ϵp and H+ adsorption energy for M-MnO2 , thus promoting the balance between H+ adsorption and desorption, which plays a determinant role on H+ intercalation. The optimized Cu-MnO2 delivers superior rate capability with the capacity of 153â
mAh g-1 at a high rate of 3â
A g-1 after 1000â
cycles. This work demonstrates that ϵp could be a significant descriptor for H+ intercalation, and tuning ϵp effectively increases H+ intercalation contribution with excellent rate capability in ZIBs.
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01-internacional
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MEDLINE
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En
Revista:
Angew Chem Int Ed Engl
Año:
2023
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Article
Pais de publicación:
ALEMANHA
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ALEMANIA
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DE
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DEUSTCHLAND
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GERMANY