Journal
ENERGY STORAGE MATERIALS
Volume 48, Issue -, Pages 335-343Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2022.03.042
Keywords
Energy storage mechanisms; Electrochemical kinetics; Zinc-ion batteries; Zinc-ion hybrid capacitors; MnO(2)nanodots
Funding
- National Natural Science Foun-dation of China [21601057]
- Hunan Provincial Natural Science Foundation [2021JJ30216]
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In this study, novel layered MnO2 nanodots were synthesized and utilized as the cathode material for aqueous zinc-ion batteries/hybrid capacitors (ZIBs/ZICs) for the first time. The delta-MnO2 NDs displayed high specific capacity, impressive rate capacity, large specific energy, and superior durability. The H+/Zn2+ co-insertion energy storage mechanism of the cathode was also verified. The quantization design strategy provides a new approach for the design and development of advanced cathodes for aqueous ZIBs and ZICs.
MnO2 has recently received great concern as a cathode material for zinc-based energy storage owing to its many advantages. Unfortunately, the low rate capability and poor cyclability hinder its practical application. Herein, novel layered MnO2 nanodots (delta-MnO2 NDs) are synthesized by a facile redox reaction, and utilized as the cathode for aqueous zinc-ion batteries/hybrid capacitors (ZIBs/ZICs) for the first time. Benefiting from the layered structure and nanoscale size, the delta-MnO2 NDs//Zn ZIBs display a considerable specific capacity of 335 mAh g(-1) at 0.1 A g(-1) , an impressive rate capacity of 125 mAh g(-1) at 2.0 A g(-1) , a large specific energy (466.7 Wh kg(-1) at 139 W kg(-1)), and a superior durability with 86.2% capacity retention after 1000 cycles at 1.0 A g(-1) . Further, the H+/Zn2+ co-insertion energy storage mechanism of the delta-MnO2 NDs cathode is verified by electrochemical kinetics analyses and ex-situ characterizations. Simultaneously, the novel ZICs based on delta-MnO2 NDs cathode exhibit a high specific energy of 68.7 Wh kg(-1 )and a satisfactory cycle life with 86.9% capacity retention after 5000 cycles at 1.0 A g(-1) . The quantization design strategy opens a new gateway for the design and exploitation of advanced cathodes for aqueous ZIBs and ZICs.
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