Growth of β-Co(OH)2 Nanoflowers on Carbon Nanotube Papers and Its Electrochemical Capacitance Performance

doi:10.3724/SP.J.1077.2013.13139

Abstract

Abstract: Uniform hierarchical flower-like β-Co(OH)₂ anchored on conducting carbon nanotube (CNT) papers were successfully synthesized by hydrothermal method, which could be served as flexible electrode material for high-performance electrochemical capacitors. The structure, morphology and properties of the products were studied by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results indicated that the as-prepared material was pure brucite phase. Three dimensional (3D) loose nano-flowerlike structure with the diameter of about 3 μm were stacked by multilevel β-Co(OH)₂ flakes. Electrochemical performances of this flexible paper-like electrode were investigated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy test in 6 mol/L KOH aqueous electrolyte. Electrochemical data indicated that the interesting β-Co(OH)₂/CNT paper composite delivered a considerable specific capacitance of 2764 F/g at current density of 2 A/g. The CNT paper acted as a good conductive and flexible substrate for the composite electrodes in supercapacitors, and the hierarchical flower-like structure of the β-Co(OH)₂ could facilitate the contact of the electrolyte. the β-Co(OH)₂ nanoflower composite performed an obvious improvement of rate capacity and cycling stability, compared with pure phase β-Co(OH)₂.

Key words: β-Co(OH)₂, carbon nanotube paper, flexible electrode, specific capacitance

CLC Number:

O646

MEN Chun-Yan, SHI Qin, LI Juan, LI Qing-Wen. Growth of β-Co(OH)₂ Nanoflowers on Carbon Nanotube Papers and Its Electrochemical Capacitance Performance[J]. Journal of Inorganic Materials, 2013, 28(12): 1321-1327.

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Growth of β-Co(OH)₂ Nanoflowers on Carbon Nanotube Papers and Its Electrochemical Capacitance Performance

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