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Title: A two-electron transfer mechanism of the Zn-doped δ-MnO2 cathode toward aqueous Zn-ion batteries with ultrahigh capacity

Journal Article · · Journal of Materials Chemistry. A
DOI: https://doi.org/10.1039/d1ta10864f · OSTI ID:1978847

Neutral aqueous zinc-ion batteries (ZIBs) have attracted considerable attention due to their safe and green features. As one typical cathode, birnessite MnO2 (δ-MnO2) suffers from low conductivity and structural instability, and its energy storage mechanism is still not well established yet. Herein, we developed a Zn-doped δ-MnO2 material via a facile and effective microwave-assisted method for the cathode in aqueous ZIBs. By incorporating Zn to modify the microstructure and promote reaction kinetics, the Zn-doped δ-MnO2 electrode demonstrates significantly enhanced electrochemical performance with an ultrahigh reversible capacity of 455 mA h g–1 and excellent specific energy of 628 W h kg–1. In addition, the successive insertion of H+ and Zn2+ and deep two-electron transfer routes are revealed systematically by ex situ experiments. In this study, the two-electron transfer route (Mn4+/Mn3+ and Mn3+/Mn2+) mechanism of Zn-doped δ-MnO2 electrodes explains the exceedingly high capacity and opens new opportunities to develop high-energy aqueous ZIBs.

Research Organization:
Univ. of Connecticut, Storrs, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE
Grant/Contract Number:
FG02-86ER13622
OSTI ID:
1978847
Alternate ID(s):
OSTI ID: 1846309
Journal Information:
Journal of Materials Chemistry. A, Vol. 10, Issue 12; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (5)