N-doped reduced graphene oxide/Co0.85Se microflowers with high mass loading as battery-type materials for quasi-solid-state hybrid supercapacitors

•N-rGO/CS microflowers with high mass loading were prepared.•The introduction of N-rGO could increase the specific surface area and enhance conductivity.•N-rGO/CS//AC quasi-solid-state HSCs were fabricated.•A high energy density of 4.65 mWh cm−3 were achieved for the assembled HSCs. [Display omitted...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-01, Vol.890, p.161801, Article 161801
Main Authors: Du, Miao, Wang, Zejin, Yang, Chao, Deng, Yefan, Wang, Ting, Zhong, Wei, Yin, Wang, Jiao, Zhichao, Xia, Weimin, Jiang, Bailing, Zhou, Kesong, Yun, Sining, Chen, Yuanqing
Format: Article
Language:English
Subjects:
Co0.85Se
Electrical resistivity
Flux density
Graphene
High mass loading
Ion transport
N-doped graphene
Quasi-solid-state supercapacitors
Solid state
Stability
Supercapacitors
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Summary:•N-rGO/CS microflowers with high mass loading were prepared.•The introduction of N-rGO could increase the specific surface area and enhance conductivity.•N-rGO/CS//AC quasi-solid-state HSCs were fabricated.•A high energy density of 4.65 mWh cm−3 were achieved for the assembled HSCs. [Display omitted] In this work, we prepared N-doped reduced graphene oxide/Co0.85Se (N-rGO/CS) microflowers through a two-step method. Since introducing N-doped rGO, the fabricated N-rGO/CS electrode with a high mass loading (~8.83 mg/cm2) exhibits high areal specific capacity of 0.522 mAh/cm2 (4.24 F/cm2) at 1 mA/cm2, and a long-term cycling stability (85.8% of capacity retention after 6000 charge-discharge cycles). This is mainly because N-doped rGO can increase specific area and electrical conductivity, enhance the electrochemical activity and effectively facilitate the electron/ion transport between the electrode and electrolyte. Besides, the quasi-solid-state hybrid supercapacitors (HSCs) assembled by the N-rGO/CS delivers a high volumetric specific capacity of 5.82 mAh/cm3 at 1 mA/cm2, excellent energy density of 4.65 mWh/cm3 under 10.5 mW/cm3 and eminement cycle stability (87.6% retention over 6000 cycles at 10 mA/cm2).
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.161801