Journal
JOURNAL OF ENERGY STORAGE
Volume 44, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2021.103254
Keywords
Supercapacitors; Ni-Co oxides; Spinel structure; Nanowires
Categories
Funding
- National Natural Science Foundation of China [51702059]
- Natural Science Foundation of Guangxi Province [2020GXNSFAA297268, 2017GXNSFBA198131]
- Innovation-Driven Development Foundation of Guangxi Province [AA17204063]
- Science and Technology plan project of Chongzuo [FA2019001]
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Ni-Co oxide nanowire arrays supported on graphene on Ni foam were fabricated using a simple strategy, showing enhanced specific capacitance and cycle stability. This approach provides a novel method for developing Ni-Co oxides materials with high charge storage performance for supercapacitors.
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 nano-wires 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 perfor-mance for supercapacitor.
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