title: Seaurchin-like hierarchical NiCo2O4@NiMoO4 core-shell nanomaterials for high performance supercapacitors.
abstract: A novel electrode material of the three-dimensional (3D) multicomponent oxide NiCo2O4@NiMoO4 core-shell was synthesized via a facile two-step hydrothermal method using a post-annealing procedure. The uniform NiMoO4 nanosheets were grown on the seaurchin-like NiCo2O4 backbone to form a NiCo2O4@NiMoO4 core-shell material constructed by interconnected ultrathin nanosheets, so as to produce hierarchical mesopores with a large specific surface area of 100.3 m(2) g(-1). The porous feature and core-shell structure can facilitate the penetration of electrolytic ions and increases the number of electroactive sites. Hence, the NiCo2O4@NiMoO4 material exhibited a high specific capacitance of 2474 F g(-1) and 2080 F g(-1) at current densities of 1 A g(-1) and 20 A g(-1) respectively, suggesting that it has not only a very large specific capacitance, but also a good rate performance. In addition, the capacitance loss was only 5.0% after 1000 cycles of charge and discharge tests at the current density of 10 A g(-1), indicating high stability. The excellent electrochemical performance is mainly attributed to its 3D core-shell and hierarchical mesoporous structures which can provide unobstructed pathways for the fast diffusion and transportation of ions and electrons, a large number of active sites and good strain accommodation.
authors.affiliation: Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai 200092, China. huzh@tongji.edu.cn.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.forename: Yanghua
authors.initials: Y
authors.lastname: Deng
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Hu
authors.forename: Yafei
authors.initials: Y
authors.lastname: Liu
authors.forename: Mingming
authors.initials: M
authors.lastname: Yao
authors.forename: Peipei
authors.initials: P
authors.lastname: Liu