In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 11, No. 3 ( 2023), p. 1380-1393
Abstract:
Amorphous manganese oxides (a-MnO x ) are widely considered promising material systems to fabricate cathodes for aqueous zinc ion batteries (AZIBs). However, the Zn-storage mechanism of a-MnO x is still not understood, and its electrochemical performance is inadequate. Herein, we report porous reduced graphene oxide boosted a-MnO x microspheres (denoted as PrGO–MnO x ) as a cathode material for AZIBs. Its electrochemical Zn-storage mechanism was elucidated via a series of ex situ measurements. Particularly, we observe that the a-MnO x phase in PrGO–MnO x is transformed into highly active and stable amorphous Zn-buserite during the initial cycles, effectively promoting Zn-storage. The cathode material can deliver a large capacity (296 mA h g −1 after 100 cycles at 0.1 A g −1 ), high-rate capability (151 mA h g −1 at 2.5 A g −1 ), and ultra-long lifespan (5000 cycles at 5.0 A g −1 ). We attribute this performance to several properties, including (i) the amorphous structure of Zn-buserite with high activity and stability, (ii) fast reaction kinetics, (iii) increased electron conductivity, (iv) improved Zn 2+ diffusion rate, and (v) high pseudocapacitance. We also assembled a PrGO–MnO x ‖AQ (9,10-anthraquinone) full-battery, which possesses a high discharge plateau (0.8 V) and impressive cycling stability (106 mA h g −1 after 500 cycles at 0.3 A g −1 ), indicating good potential towards practical applications.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702232-8
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