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Dual cation doping enabling simultaneously boosted capacity and rate capability of MnO2 cathodes for Zn//MnO2 batteries

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Abstract

Aqueous rechargeable Zn//MnO2 batteries show promising prospects for grid-scale energy storage due to their intrinsic safety, abundant resource, and potential high performance. Unfortunately, the real capability of these devices is far from satisfactory thanks to the low capacity and sluggish kinetics of the MnO2 cathode. Herein, we report a dual cation doping strategy by synthesis of MnO2 in the presence of Ti3C2X MXenes and Ni2+ ions to essentially address these drawbacks. Such a process contributes to a Ti,Ni co-doped α-MnO2 anchored on MXenes. The Ti3+ ions incorporated in the framework allow a partial multivalent variation for a large capacity while the Ni2+ ions promote the H+ transfer within the MnO2 matrix via the Grotthuss proton transport manner. As a result, the optimal dual cation doped MnO2 exhibits a large reversible capacity of 378 mAh·g−1 at 0.1 C and a high rate capability. Moreover, capacity retention as high as 92% is observed after cycling at 4 C for 1000 times, far superior to many of the previously reported results. This facile strategy demonstrated here may shed new insight into the rational design of electrodes based on high-performance Zn//MnO2 batteries.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 21975258, 22179145, 22005341, and 21878336), the startup support grant from China University of Petroleum (East China), and Shandong Provincial Natural Science Foundation (Nos. ZR2020ZD08 and ZR2018ZC1458).

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  1. State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China

    Chongze Wang, Hao Yang, Bin Wang, Peibin Ding, Yi Wan, Wenjing Bao, Yanan Li, Suyan Ma, Yang Liu, Yukun Lu & Han Hu

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  1. Chongze Wang
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Wang, C., Yang, H., Wang, B. et al. Dual cation doping enabling simultaneously boosted capacity and rate capability of MnO2 cathodes for Zn//MnO2 batteries. Nano Res. 16, 9488–9495 (2023). https://doi.org/10.1007/s12274-023-5717-8

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