Journal
NANO-MICRO LETTERS
Volume 13, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-020-00527-w
Keywords
Pseudocapacitive storage; Creeper-like Ni3Si2; NiOOH; Graphene; All-solid-state supercapacitors
Funding
- Natural Science Basic Research Plan in Shaanxi Province of China [2019ZDLGY16-02, 2019ZDLGY16-03, 2019ZDLGY16-08]
- Youth Science and Technology Nova Program of Shaanxi Province [2020KJXX-068]
- Wuhu and Xidian University special fund for industry-university-research cooperation [HX01201909039]
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The study focuses on synthesizing creeper-like Ni3Si2/NiOOH/graphene nanostructures via low-pressure all-solid melting-reconstruction chemical vapor deposition, which exhibit excellent performance characteristics for microenergy storage devices. By controlling the growth conditions, the high-performance composite nanostructure can be produced on a large scale for practical applications.
Recent developments in the synthesis of graphene-based structures focus on continuous improvement of porous nanostructures, doping of thin films, and mechanisms for the construction of three-dimensional architectures. Herein, we synthesize creeper-like Ni3Si2/NiOOH/graphene nanostructures via low-pressure all-solid melting-reconstruction chemical vapor deposition. In a carbon-rich atmosphere, high-energy atoms bombard the Ni and Si surface, and reduce the free energy in the thermodynamic equilibrium of solid Ni-Si particles, considerably catalyzing the growth of Ni-Si nanocrystals. By controlling the carbon source content, a Ni3Si2 single crystal with high crystallinity and good homogeneity is stably synthesized. Electrochemical measurements indicate that the nanostructures exhibit an ultrahigh specific capacity of 835.3 C g(-1) (1193.28 F g(-1)) at 1 A g(-1); when integrated as an all-solid-state supercapacitor, it provides a remarkable energy density as high as 25.9 Wh kg(-1) at 750 W kg(-1), which can be attributed to the free-standing Ni3Si2/graphene skeleton providing a large specific area and NiOOH inhibits insulation on the electrode surface in an alkaline solution, thereby accelerating the electron exchange rate. The growth of the high-performance composite nanostructure is simple and controllable, enabling the large-scale production and application of microenergy storage devices.
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