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Nickel sulfide-based energy storage materials for high-performance electrochemical capacitors

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Abstract

Supercapacitors are favorable energy storage devices in the field of emerging energy technologies with high power density, excellent cycle stability and environmental benignity. The performance of supercapacitors is definitively influenced by the electrode materials. Nickel sulfides have attracted extensive interest in recent years due to their specific merits for supercapacitor application. However, the distribution of electrochemically active sites critically limits their electrochemical performance. Notable improvements have been achieved through various strategies such as building synergetic structures with conductive substrates, enhancing the active sites by nanocrystallization and constructing nanohybrid architecture with other electrode materials. This article overviews the progress in the reasonable design and preparation of nickel sulfides and their composite electrodes combined with various bifunctional electric double-layer capacitor (EDLC)-based substances (e.g., graphene, hollow carbon) and pseudocapacitive materials (e.g., transition-metal oxides, sulfides, nitrides). Moreover, the corresponding electrochemical performances, reaction mechanisms, emerging challenges and future perspectives are briefly discussed and summarized.

Graphic abstract

This review presents the progress in the reasonable design and preparation of nickel sulfides and their applications in electrochemical capacitors. The corresponding electrochemical performances, reaction mechanisms, emerging challenges, and future perspectives are briefly discussed and summarized.

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Fig. 1

(reproduced from Ref. [112], Copyright 2017 Springer Nature)

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(reproduced from Ref. [109], Copyright 2018 The Royal Society of Chemistry)

Fig. 3

(reproduced from Ref. [134]. Copyright 2015 Elsevier)

Fig. 4

(reproduced from Ref. [135], Copyright 2014 The Royal Society of Chemistry)

Fig. 5

(reproduced from Ref. [138], Copyright 2017 The Electrochemical Society)

Fig. 6

(reproduced from Ref. [146]. Copyright 2016 Springer Nature)

Fig. 7

(reproduced from Ref. [158], Copyright 2016 The Royal Society of Chemistry)

Fig. 8

(reproduced from Ref. [137], Copyright 2018 Elsevier)

Fig. 9

(reproduced from Ref. [163]. Copyright 2018 Elsevier)

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51302079, 51702138 and 51403193), the Natural Science Foundation of Hunan Province (No. 2017JJ1008) and the Key Research and Development Program of Hunan Province of China (No. 2018GK2031).

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Pothu, R., Bolagam, R., Wang, QH. et al. Nickel sulfide-based energy storage materials for high-performance electrochemical capacitors. Rare Met. 40, 353–373 (2021). https://doi.org/10.1007/s12598-020-01470-w

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