Superior Pseudocapacitive Storage of a Novel Ni3Si2/NiOOH/Graphene Nanostructure for an All?Solid?State Supercapacitor

• 作者: Dong Wang Hong Zhou Jincheng Zhang Jing Ning Maoyang Xia Xin Feng Yue Hao
• 来源期刊: 纳微快报（英文）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Energy Conversion and Storage (Battery, Supercapacitor)
• 页码范围: 15-28
• 页数: 14页
• 语种: 英文

摘要

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 threedimensional architectures. Herein, we synthesize creeper-like Ni3Si2/ NiOOH/graphene nanostructures via low-pressure all-solid meltingreconstruction 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-solidstate 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 freestanding 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.