title: One-step synthesis of free-standing α-Ni(OH)₂ nanosheets on reduced graphene oxide for high-performance supercapacitors.
abstract: In this work, a hierarchical hybrid structure of reduced graphene oxide (rGO) supported ultrathin α-Ni(OH)2 nanosheets (denoted as α-Ni(OH)2@rGO NSs) has been developed successfully via an environmentally friendly one-step solution method. The resulting product of α-Ni(OH)2@rGO NSs was further characterized by scanning electron microscope, transmission electron microscope, x-ray diffraction, Raman spectroscopy, x-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller. The ultrathin α-Ni(OH)2 nanosheets of around 6 nm in thickness are uprightly coated on the double sides of rGO substrate. When evaluated as electrodes for supercapacitors, the hybrid α-Ni(OH)2@rGO NSs demonstrate excellent supercapacitor performance and cycling stability, compared with the self-aggregated α-Ni(OH)2 powder. Even after 2000 cycles, the hybrid electrodes still can deliver a specific capacitance of 1300 F g(-1) at the current density of 5 A g(-1), corresponding to no capacity loss of the initial cycle. Such excellent electrochemical performance should be attributed to the ultrathin, free-standing, and hierarchical nanosheets of α-Ni(OH)2, which not only promote efficient charge transport and facilitate the electrolyte diffusion, but also prevent aggregation of electro-active materials effectively during the charge-discharge process.
authors.affiliation: State Key Laboratory for Mechanical Behavior of Materials and MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter and Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
authors.forename: Bitao
authors.initials: B
authors.lastname: Dong
authors.forename: Han
authors.initials: H
authors.lastname: Zhou
authors.forename: Jin
authors.initials: J
authors.lastname: Liang
authors.forename: Lusi
authors.initials: L
authors.lastname: Zhang
authors.forename: Guoxin
authors.initials: G
authors.lastname: Gao
authors.forename: Shujiang
authors.initials: S
authors.lastname: Ding
mesh_terms: D025802:Electric Capacitance; D004563:Electrochemistry; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D009532:Nickel / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*
chemical_list: D010087:Oxides; D006108:Graphite; D009532:Nickel