title: Free-standing porous manganese dioxide/graphene composite films for high performance supercapacitors.
abstract: A simple hard template method and hydrothermal process have been employed to fabricate a self-standing hierarchical porous MnO2/graphene film. Thus-constructed electrode materials for binder-free supercapacitors exhibit a high specific capacitance of 266.3 F g(-1) at the density of 0.2 A g(-1). Moreover, the two-electrode device demonstrates an excellent rate capability and cycling stability with capacitance retention of 85.1% after 2000 charge-discharge cycles at a current density of 1 A g(-1). The porous nanostructured design can effectively improve the specific surface areas and account for the shorter relaxation time for the electrodes, resulting in a high electrochemical performance.
authors.affiliation: University of Chinese Academy of Sciences, Beijing 100049, China; National Center for Nanoscience and Technology, Beijing 100190, China.
authors.forename: Wang-Huan
authors.initials: WH
authors.lastname: Guo
authors.affiliation: National Center for Nanoscience and Technology, Beijing 100190, China.
authors.forename: Teng-Jiao
authors.initials: TJ
authors.lastname: Liu
authors.affiliation: National Center for Nanoscience and Technology, Beijing 100190, China; CAS Key Laboratory of Standardization and Measurement for Nanotechnology, Beijing 100190, China. Electronic address: pjiang@nannoctr.cn.
authors.forename: Peng
authors.initials: P
authors.lastname: Jiang
authors.affiliation: University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: zhangzhanjun@ucas.ac.cn.
authors.forename: Zhan-Jun
authors.initials: ZJ
authors.lastname: Zhang
keywords: Graphene; Hybrid; MnO(2); Porous material; Symmetric supercapacitor