期刊
GREEN ENERGY & ENVIRONMENT
卷 7, 期 6, 页码 1289-1297出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.gee.2021.02.002
关键词
Mn doped; Co9S8@Co(OH)(2); MOF; High capacitance; Asymmetric supercapacitor
类别
资金
- Natural Science Foundation of Zhejiang Province [LY21B030005]
- National Natural Science Foundation of China [51702287]
A novel Mn doped Co9S8@Co(OH)2 nanosheet array electrode material was prepared by a new method, which greatly improved the capacitance and cycling stability, providing a new approach for optimizing electrode materials for supercapacitors.
Transition metal sulfides (TMSs) have been regarded as greatly promising electrode materials for supercapacitors because of abundant redox electroactive sites and outstanding conductivity. Herein, we report a self-supported hierarchical Mn doped Co9S8@Co(OH)(2) nanosheet arrays on nickel foam (NF) substrate by a one-step metal-organic-framework (MOF) engaged approach and a subsequent sulfurization process. Experimental results reveal that the introduction of manganese endows improved electric conductivity, enlarged electrochemical specific surface area, adjusted electronic structure of Co9S8@Co(OH)(2) and enhanced interfacial activities as well as facilitated reaction kinetics of electrodes. The optimal Mn doped Co9S8@Co(OH)(2) electrode exhibits an ultrahigh specific capacitance of 3745 F g(-1) at 1 A g(-1) (5.618 F cm(-2) at 1.5 mA cm(-2)) and sustains 1710 F g(-1) at 30 A g(-1) (2.565 F cm(-2) at 45 mA cm(-2)), surpassing most reported values on TMSs. Moreover, a battery-type asymmetric supercapacitor (ASC) device is constructed, which delivers high energy density of 50.2 Wh kg(-1) at power density of 800 W kg(-1), and outstanding long-term cycling stability (94% capacitance retention after 8000 cycles). The encouraging results might offer an effective strategy to optimize the TMSs for energy-storage devices. (c) 2021 Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.
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