Hierarchically nanostructured Zn0.76C0.24S@Co(OH)2 for high-performance hybrid supercapacitor

Ren, Xiaohe, Sun, Mengxuan, Gan, Ziwei, Li, Zhijie, Cao, Baobao, Shen, Wenzhong and Fu, Yong Qing (2022) Hierarchically nanostructured Zn0.76C0.24S@Co(OH)2 for high-performance hybrid supercapacitor. Journal of Colloid and Interface Science, 618. pp. 88-97. ISSN 0021-9797

Manuscript_Zn0.76C0.24S_Co_OH_2.pdf - Accepted Version
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Official URL: https://doi.org/10.1016/j.jcis.2022.03.069


It is a great challenge to achieve both high specific capacity and high energy density of supercapacitors by designing and constructing hybrid electrode materials through a simple but effective process. In this paper, we proposed a hierarchically nanostructured hybrid material combining Zn0.76Co0.24S (ZCS) nanoparticles and Co(OH)2 (CH) nanosheets using a two-step hydrothermal synthesis strategy. Synergistic effects between ZCS nanoparticles and CH nanosheets result in efficient ion transports during the charge-discharge process, thus achieving a good electrochemical performance of the supercapacitor. The synthesized ZCS@CH hybrid exhibits a high specific capacity of 1152.0 C g-1 at a current density of 0.5 A g-1 in 2 M KOH electrolyte. Its capacity retention rate is maintained at ∼ 70.0% when the current density is changed from 1 A g-1 to 10 A g-1. A hybrid supercapacitor (HSC) assembled from ZCS@CH as the cathode and active carbon (AC) as the anode displays a capacitance of 155.7 F g-1 at 0.5 A g-1, with a remarkable cycling stability of 91.3% after 12,000cycles. Meanwhile, this HSC shows a high energy density of 62.5 Wh kg-1 at a power density of 425.0 W kg-1, proving that the developed ZCS@CH is a promising electrode material for energy storage applications.

Item Type: Article
Additional Information: Funding information: This work is supported by the International Exchange Grant (IEC/NSFC/201078) through Royal Society UK and National Natural Science Foundation of China.
Uncontrolled Keywords: Supercapacitor, Zn0.76Co0.24S, Co(OH)2, Hybrid nanostructures, Hydrothermal method
Subjects: F200 Materials Science
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 04 Apr 2022 13:49
Last Modified: 22 Mar 2023 08:00
URI: https://nrl.northumbria.ac.uk/id/eprint/48807

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