title: Hierarchical core-shell structure of ZnO nanorod@NiO/MoO₂ composite nanosheet arrays for high-performance supercapacitors.
abstract: A hierarchical core-shell structure of ZnO nanorod@NiO/MoO2 composite nanosheet arrays on nickel foam substrate for high-performance supercapacitors was constructed by a two-step solution-based method involving two hydrothermal processes followed by a calcination treatment. Compared to one composed of pure NiO/MoO2 composite nanosheets, the hierarchical core-shell structure electrode displays better pseudocapacitive behaviors in 2 M KOH, including high areal specific capacitance values of 1.18 F cm(-2) at 5 mA cm(-2) and 0.6 F cm(-2) at 30 mA cm(-2) as well as relatively good rate capability at high current densities. Furthermore, it also shows remarkable cycle stability, remaining at 91.7% of the initial value even after 4000 cycles at a current density of 10 mA cm(-2). The enhanced pseudocapacitive behaviors are mainly due to the unique hierarchical core-shell structure and the synergistic effect of combining ZnO nanorod arrays and NiO/MoO2 composite nanosheets. This novel hierarchical core-shell structure shows promise for use in next-generation supercapacitors.
authors.affiliation: College of Physics and Microelectronics, State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University , Hunan 410082, China.
authors.forename: Sucheng
authors.initials: S
authors.lastname: Hou
authors.forename: Guanhua
authors.initials: G
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Zeng
authors.forename: Jian
authors.initials: J
authors.lastname: Zhu
authors.forename: Feilong
authors.initials: F
authors.lastname: Gong
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.forename: Huigao
authors.initials: H
authors.lastname: Duan