title: NiO/nanoporous graphene composites with excellent supercapacitive performance produced by atomic layer deposition.
abstract: Nickel oxide (NiO) is a promising electrode material for supercapacitors because of its low cost and high theoretical specific capacitance of 2573 F g(-1). However, the low electronic conductivity and poor cycling stability of NiO limit its practical applications. To overcome these limitations, an efficient atomic layer deposition (ALD) method is demonstrated here for the fabrication of NiO/nanoporous graphene (NG) composites as electrode materials for supercapacitors. ALD allows uniform deposition of NiO nanoparticles with controlled sizes on the surface of NG, thus offering a novel route to design NiO/NG composites for supercapacitor applications with high surface areas and greatly improved electrical conductivity and cycle stability. Electrochemical measurements reveal that the NiO/NG composites obtained by ALD exhibited excellent specific capacitance of up to ∼ 1005.8 F g(-1) per mass of the composite electrode (the specific capacitance value is up to ∼ 1897.1 F g(-1) based on the active mass of NiO), and stable performance after 1500 cycles. Furthermore, electrochemical performance of the NiO/NG composites is found to strongly depend on the size of NiO nanoparticles.
authors.affiliation: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, People's Republic of China. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China.
authors.forename: Caiying
authors.initials: C
authors.lastname: Chen
authors.forename: Chaoqiu
authors.initials: C
authors.lastname: Chen
authors.forename: Peipei
authors.initials: P
authors.lastname: Huang
authors.forename: Feifei
authors.initials: F
authors.lastname: Duan
authors.forename: Shichao
authors.initials: S
authors.lastname: Zhao
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Jinchuan
authors.initials: J
authors.lastname: Fan
authors.forename: Weiguo
authors.initials: W
authors.lastname: Song
authors.forename: Yong
authors.initials: Y
authors.lastname: Qin