期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 23, 页码 20729-20737出版社
AMER CHEMICAL SOC
DOI: 10.1021/am506660q
关键词
supercapacitor; cobalt oxide; hybrothermal; microdumbbell; electrochemical; hexanitrocobaltate
资金
- Ministry of Education in Singapore [RGT27/13]
In this study, three-dimensional cobalt oxide microstructures were developed. Cobalt oxide microdumbbells and microspheres, assembled by nanowires and primary particles, were successfully synthesized by a multistep hydrothermal method. Of all of the structures, the cobalt oxide microdumbbell electrode possesses the largest surface area of 70.8 m(2) g(-1) and the highest specific capacitance of 407.5 F g(-1). The as-prepared electrode also demonstrates excellent electrochemical stability and retains 97.5% of the initial capacitance after 2000 charge-discharge cycles. This performance is attributed to the desirable morphology, uniform microarchitecture stability, and high surface area. The results show that the as-fabricated Co3O4 is a promising electrode material for supercapacitor applications.
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