A high-performance flexible supercapacitor based on hierarchical Co3O4-SnO@SnO2 nanostructures. (1st June 2019)

• Record Type: Journal Article
• Authors: Wang, Zhihua; Long, Yu; Cao, Ding; Han, Dongmei; Gu, Fubo
• Is Part Of: Electrochimica acta. Volume 307(2019)
• Page Start: 341
• Page End: 350
• Publication Date: 2019-06-01
• Subjects: Supercapacitors -- Hierarchical -- Nanostructures -- High capacitance -- Flexible electrode; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.03.230
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: In this paper, hierarchical Co3 O4 -SnO@SnO2 nanostructures flexible supercapacitor electrodes were fabricated by hydrothermal routine. Owing to the introduction of Co3 O4 as well as a cleverly PN junction hierarchically skeleton, the Co3 O4 -SnO@SnO2 electrode presents a structure of nanospheres covered by nanoparticles, offering a low internal resistance (0.6 Ω) and high electrical conductivity. Without the use of a binder and complicated manufacturing process, the hierarchical nanostructures can be directly used as the working electrode in the three-electrode system. In addition, the electrode demonstrates a high specific capacitance (1.056 F cm −2 at 1 mA cm −2 ) and excellent stability (only 8.5% was lost in initial specific capacitance at 1 mA cm −2 after 2000 cycles). Therefore, the hierarchical Co3 O4 -SnO@SnO2 nanostructures provide an opportunity for the coordinated development of novel energy density and power density of supercapacitor. Highlights: Metal oxides are introduced into the skeleton by a cleverly PN junction hierarchical nanostructure. Built-in electric field in hierarchical nanostructure can reduce the electrode internal resistance to 0.6 Ω. The hierarchical nanostructure electrode exhibits excellent discharge time, good cycle stability and higher capacitance.