NiO-Microflower Formed by Nanowire-weaving Nanosheets with Interconnected Ni-network Decoration as Supercapacitor Electrode

作者：Ci, Suqing; Wen, Zhenhai^*; Qian, Yuanyuan; Mao, Shun; Cui, Shumao; Chen, Junhong

来源：Scientific Reports, 2015, 5(1): 11919.

DOI：10.1038/srep11919

• HIGH-ENERGY DENSITY
• HIGH-QUALITY
• CAPACITANCE
• FABRICATION
• ARRAYS
• NANOSTRUCTURES
• SHAPE

We propose a 'weaving' evolution mechanism, by systematically investigating the products obtained in controlled experiments, to demonstrate the formation of Ni-based 'microflowers' which consists of multiple characteristic dimensions, in which the three dimensional (3D) NiO 'microflower' is constructed by a two-dimensional (2D) nanosheet framework that is derived from weaving one-dimensional (1D) nanowires. We found such unique nanostructures are conducive for the generation of an electrically conductive Ni-network on the nanosheet surface after being exposed to a reducing atmosphere. Our study offers a promising strategy to address the intrinsic issue of poor electrical conductivity for NiO-based materials with significant enhancement of utilization of NiO active materials, leading to a remarkable improvement in the performance of the Ni-NiO microflower based supercapacitor. The optimized Ni-NiO microflower material showed a mass specific capacitance of 1,828 F g(-1), and an energy density of 15.9 Wh kg(-1) at a current density of 0.5 A g(-1). This research not only contributes to understanding the formation mechanism of such 'microflower' structures but also offers a promising route to advance NiO based supercapacitor given their ease of synthesis, low cost, and long-term stability.

• 出版日期2015-7-13
• 单位南昌航空大学