title: Reduced graphene oxide/Ni(1-x)Co(x)Al-layered double hydroxide composites: preparation and high supercapacitor performance.
abstract: Reduced graphene oxide (rGO) sheet and ternary-component Ni(1-x)Co(x)Al-layered double hydroxide (Ni(1-x)Co(x)Al-LDH) hybrid composites with an interesting sandwich structure have been fabricated by an in situ growth route. The as-obtained composite displays a sandwich architecture constructed by the self-assembly of sheet-like LDH crystals on both sides of the rGO sheets. It was found that the Co content doped in Ni(1-x)Co(x)Al-LDH plays an important role in the shape and structure of the final products. When the Co doped content is 17%, the rGO/Ni(0.83)Co(0.17)Al-LDH has a high surface area (171.5 m(2) g(-1)) and exhibits a perfect sandwich structure. In addition, this structure and morphology is favorable for a supercapacitor electrode material with a high performance. The influence of cobalt content on the electrochemical behavior of rGO/Ni(1-x)Co(x)Al-LDH has been systematically studied. The results indicate that the rGO/Ni(0.83)Co(0.17)Al-LDH composite exhibits the highest electrochemical performance, with a specific capacitance of 1902 F g(-1) at 1 A g(-1), and an excellent cycling stability. The markedly improved electrochemical performance is superior to undoped rGO/NiAl-LDH and can be attributed to the enhanced conductivity achieved through cobalt doping. Such composites could be used as a type of potential energy storage/conversion material for supercapacitors.
authors.affiliation: Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Sciences and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China. yangpiaoping@hrbeu.edu.cn gaopeng@hrbeu.edu.cn.
authors.forename: Jie
authors.initials: J
authors.lastname: Xu
authors.forename: Shili
authors.initials: S
authors.lastname: Gai
authors.forename: Fei
authors.initials: F
authors.lastname: He
authors.forename: Na
authors.initials: N
authors.lastname: Niu
authors.forename: Peng
authors.initials: P
authors.lastname: Gao
authors.forename: Yujin
authors.initials: Y
authors.lastname: Chen
authors.forename: Piaoping
authors.initials: P
authors.lastname: Yang