High-performance asymmetrical supercapacitor composed of rGO-enveloped nickel phosphite hollow spheres and N/S co-doped rGO aerogel

• Published in: Nano research Vol. 11; no. 3; pp. 1651 - 1663
• Main Authors: Zhang, Deyang, Zhang, Yihe, Luo, Yongsong, Zhang, Yu, Li, Xiaowei, Yu, Xuelian, Ding, Hao, Chu, Paul K., Sun, Li
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01-03-2018; Springer Nature B.V
• Subjects: Aerogels; Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Capacitance; Chemistry and Materials Science; Condensed Matter Physics; Cycles; Diodes; Electric potential; Electrochemistry; Electrodes; Fabrication; Infiltration; Light emitting diodes; Materials Science; Microspheres; Nanotechnology; Nickel; Nitrogen; Organic light emitting diodes; Porosity; Research Article; Retention; Sulfur; Supercapacitors; Voltage; 亚磷酸盐;不均匀;镍;存储设备;支持电解质;电压范围;电气化学;制造技术; nickel phosphate; asymmetrical; hollow sphere; graphene; nitrogen/sulfur co-doping; supercapacitor
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-017-1780-3

An asymmetrical supercapacitor （ASC）, comprising reduced graphene oxide （rGO）-encapsulated nickel phosphite hollow microspheres （NPOH-0.5@rGO） as positive electrode, and porous nitrogen/sulfur co-doped rGO aerogel （NS-3D rGO） as negative electrode has been prepared. The NPOH-0.5@rGO electrode combines the advantages of the NPOH hollow microspheres and the conductive rGO layers giving rise to a large specific capacitance, high cycling reversibility, and excellent rate performance. The NS-3D rGO electrode with abundant porosity and active sites promotes electrolyte infiltration and broadens the working voltage range. The ASC （NPOH-0.5@rGO//NS-3D rGO） shows a maximum voltage of up to 1.4 V, outstanding cycling ability （capacitance retention of 95.5% after 10,000 cycles）, and excellent rate capability （capacitance retention of 77% as the current density is increased ten times）. The ASC can light up an light-emitting diodes （LED） for more than 20 min after charging for 20 s. The fabrication technique and device architecture can be extended to other active oxide and carbon-based materials for next-generation high-performance electrochemical storage devices.