Microwave-assisted synthesis of spherical β-Ni(OH)<inf>2</inf>superstructures for electrochemical capacitors with excellent cycling stability

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Journal Article
Chemical Physics Letters, 2014, 610-611 pp. 115 - 120
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A novel single-step microwave-assisted process has been developed to synthesize spherical β-Ni(OH)2superstructures without using any templates. Structure characterizations show that the spherical β-Ni(OH)2composed of twisted nanosheets was obtained. The electrochemical properties of the as-prepared materials were evaluated by cyclic voltammetry and chronopotentiometry technology in 2 M KOH solution. Due to the unique morphology, the prepared β-Ni(OH)2electrode displays a high specific capacitance of 2147 F g-1at a discharge current of 1 A g-1and outstanding cycling stability (99.5% capacitance retained after 2000 cycles), suggesting its potential application as an efficient electrode material for high-performance electrochemical capacitors. © 2014 Elsevier B.V.
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