title: Hierarchical NiCo2 S4 Nanotube@NiCo2 S4 Nanosheet Arrays on Ni Foam for High-Performance Supercapacitors.
abstract: Hierarchical NiCo2 S4 nanotube@NiCo2 S4 nanosheet arrays on Ni foam have been successfully synthesized. Owing to the unique hierarchical structure, enhanced capacitive performance can be attained. A specific capacitance up to 4.38 F cm(-2) is attained at 5 mA cm(-2) , which is much higher than the specific capacitance values of NiCo2 O4 nanosheet arrays, NiCo2 S4 nanosheet arrays and NiCo2 S4 nanotube arrays on Ni foam. The hierarchical NiCo2 S4 nanostructure shows superior cycling stability; after 5000 cycles, the specific capacitance still maintains 3.5 F cm(-2) . In addition, through the morphology and crystal structure measurement after cycling stability test, it is found that the NiCo2 S4 electroactive materials are gradually corroded; however, the NiCo2 S4 phase can still be well-maintained. Our results show that hierarchical NiCo2 S4 nanostructures are suitable electroactive materials for high performance supercapacitors.
authors.affiliation: Department of Materials Science and Engineering, China Jiliang University (CJLU), Hangzhou, 310018, China. chenhc@cjlu.edu.cn.
authors.forename: Haichao
authors.initials: H
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, China Jiliang University (CJLU), Hangzhou, 310018, China.
authors.forename: Si
authors.initials: S
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, China Jiliang University (CJLU), Hangzhou, 310018, China.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Shao
authors.affiliation: Department of Materials Science and Engineering, China Jiliang University (CJLU), Hangzhou, 310018, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.affiliation: Department of Materials Science and Engineering, China Jiliang University (CJLU), Hangzhou, 310018, China.
authors.forename: Meiqiang
authors.initials: M
authors.lastname: Fan
authors.affiliation: Department of Materials Science and Engineering, China Jiliang University (CJLU), Hangzhou, 310018, China.
authors.forename: Da
authors.initials: D
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, China Jiliang University (CJLU), Hangzhou, 310018, China.
authors.forename: Guanglei
authors.initials: G
authors.lastname: Tian
authors.affiliation: Department of Materials Science and Engineering, China Jiliang University (CJLU), Hangzhou, 310018, China. shukangying@cjlu.edu.cn.
authors.forename: Kangying
authors.initials: K
authors.lastname: Shu
keywords: asymmetric; energy storage; hierarchical structure; nickel cobalt sulfides; supercapacitors