title: Large-scale uniform α-Co(OH)₂ long nanowire arrays grown on graphite as pseudocapacitor electrodes.
abstract: Large-scale uniform α-Co(OH)₂ nanowire arrays (NWAs) with an average length of ∼20 μm grown on pyrolytic graphite (PG) were successfully synthesized by a hydrothermal method at 120 °C. Ultrasonication test was carried out toward the as-made nanoarray products and the result demonstrated their robust adhesion to graphitic substrate. After 300 s of sonication testing, α-Co(OH)₂ NWAs could still possess both integrated one-dimensional (1D) nanoarray architecture and good electronic connections with current collector. When investigated as electrochemical pseudocapacitor electrodes, α-Co(OH)₂ NWAs exhibited good energy-storage performance in terms of high specific capacitance of 642.5 F/g, good rate capability, and excellent capacity retention. Our work not only presents a cost-effective and scale-up synthetic method for α-Co(OH)₂ NWAs but also holds promise in general synthesis of long arrays of other metal hydroxides/oxide (TiO₂, Fe₂O₃, SnO₂, etc.) nanostructures on PG substrate by using α-Co(OH)₂ NWAs as sacrificial templates.
authors.affiliation: Institute of Nanoscience and Nanotechnology, Department of Physics, Huazhong Normal University, Wuhan 430079, PR China.
authors.forename: Jian
authors.initials: J
authors.lastname: Jiang
authors.forename: Jinping
authors.initials: J
authors.lastname: Liu
authors.forename: Ruimin
authors.initials: R
authors.lastname: Ding
authors.forename: Jianhui
authors.initials: J
authors.lastname: Zhu
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Li
authors.forename: Anzheng
authors.initials: A
authors.lastname: Hu
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Xintang
authors.initials: X
authors.lastname: Huang
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053770:Nanowires / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D006878:Hydroxides; D003035:Cobalt; D006108:Graphite