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Synthesis of cross-linked Ni-Co oxide nanowires on graphene hydrogel with high capacitive performance for hybrid supercapacitors

Synthesis of cross-linked Ni-Co oxide nanowires on graphene hydrogel with high capacitive performance for hybrid supercapacitors

Authors :
Haifu Huang
Xianqing Liang
Wenzheng Zhou
Hailong Shen
Jin Guo
Liqing Yan
Shuaikai Xu
Faxin Yan
Geng Wei
Source :
Journal of Energy Storage. 44:103254
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

Herein, Ni-Co oxide nanowire arrays on graphene supported by Ni foam are fabricated by a simple strategy. In this strategy, the Ni-Co oxide nanosheets are induced to evolve into ultra-fine nanowires with high length/diameter ratio through two-step hydrothermal process, which can effectively increase the surface area, enhance electrochemical activity and improve electron/charge transfer efficiency, thereby resulting in enhanced charge storage performance. It is worth noting that the graphene as a support help to optimize capacitive performance of Ni-Co oxides nanowires. As expected, Ni-Co oxide nanowires anchored on graphene show enhanced specific capacitance of 2619.4 F g−1, due to high-efficient synergistic effect of graphene. However, Ni-Co oxides nanowires directly anchored on Ni foam without graphene have a relatively low specific capacitance of 1950.7 F g−1 at 1 A g−1, but still higher that that of Ni-Co oxides nanosheets arrays (1632.4 F g−1). Furthermore, the hybrid supercapacitor assembled by the Ni-Co oxides nanowires anchored on graphene and nitrogen doped graphene materials shows a specific energy of 24.8 Wh kg−1 and great cycle stability of 90.3% retention after 8000 cycles. This work also provides a strategy to construct novel Ni-Co oxides materials with high charge storage performance for supercapacitor.

Details

ISSN :
2352152X
Volume :
44
Database :
OpenAIRE
Journal :
Journal of Energy Storage
Accession number :
edsair.doi...........4ceaef4702875c32dc53320a7777cd50
Full Text :
https://doi.org/10.1016/j.est.2021.103254