title: Controllable fabrication of urchin-like Co3O4hollow spheres for high-performance supercapacitors and lithium-ion batteries.
abstract: Urchin-like cobalt oxide (Co3O4) hollow spheres can be successfully prepared by thermal decomposition of cobalt carbonate hydroxide hydrate (Co(CO3)0.5(OH)·0.11H2O) obtained by template-assisted hydrothermal synthesis. The morphology, crystal structure evolution and thermal decomposition behaviors of the as-prepared products have been carefully investigated. A plausible formation mechanism of the urchin-like Co3O4hollow spheres in the presence of hexadecyl trimethyl ammonium bromide (CTAB) as the surfactant template is proposed. The urchin-like Co3O4hollow spheres are further constructed as electrode materials for high-performance supercapacitors with a high specific capacitance of 460 F g-1at a current density of 4 A g-1and excellent cycling stability. Furthermore, as anode materials for lithium-ion batteries (LIBs), superior lithium storage performance of 1342.2 mA h g-1(0.1 C) and 1122.7 mA h g-1(0.2 C) can also be achieved. The excellent performances can be ascribed to the unique hierarchical urchin-like hollow structure of the electrode materials, which offers a large specific surface area, short electron and ion diffusion paths and high permeability while being directly in contact with the electrolyte. Moreover, the hollow structure with sufficient internal void spaces can self-accommodate volume change during electrochemical reactions, which improves the structural stability and integrity.
authors.affiliation: State Key Laboratory of Powder Metallurgy and School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China. liuxh@csu.edu.cn MA.Renzhi@nims.go.jp and Institute for Materials Microstructure, Central South University, Changsha, Hunan 410083, China.
authors.forename: Fashen
authors.initials: F
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Powder Metallurgy and School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China. liuxh@csu.edu.cn MA.Renzhi@nims.go.jp and Institute for Materials Microstructure, Central South University, Changsha, Hunan 410083, China.
authors.forename: Xiaohe
authors.initials: X
authors.lastname: Liu
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.
authors.forename: Zhian
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Powder Metallurgy and School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China. liuxh@csu.edu.cn MA.Renzhi@nims.go.jp.
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Powder Metallurgy and School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China. liuxh@csu.edu.cn MA.Renzhi@nims.go.jp.
authors.forename: Anqiang
authors.initials: A
authors.lastname: Pan
authors.affiliation: State Key Laboratory of Powder Metallurgy and School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China. liuxh@csu.edu.cn MA.Renzhi@nims.go.jp.
authors.forename: Shuquan
authors.initials: S
authors.lastname: Liang
authors.affiliation: State Key Laboratory of Powder Metallurgy and School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China. liuxh@csu.edu.cn MA.Renzhi@nims.go.jp and International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Renzhi
authors.initials: R
authors.lastname: Ma