Synthesis of high electrochemical performance Ni(OH)2 nanosheets through a solvent-free reaction for application in supercapacitor

•α-Ni(OH)2 nanosheets were synthesized through a solvent-free reaction on a ultra large scale.•The nanosheets was formed by grinding nickel nitrate and morpholine at room temperature.•The prepared α-Ni(OH)2 presented high electrochemical performance.

α-Ni(OH)2 nanosheets were prepared at room temperature on ultra large scale through a solvent-free reaction. The nanosheets were obtained by grinding the mixture of nickel nitrate hexahydrate and morpholine in a mortar for 5 min. The maximum capacity of production in single batch was only limited by volume of the vessels used in preparation. The as-prepared nanosheets exhibited the highest specific capacitance of 2080.8 F g−1 at discharge current density of 0.6 A g−1 in a 6 mol l−1 KOH aqueous solution. The nanosheets also presented other high electrochemical performances such as nearly 100% coulombic efficiency, excellent rate capacity and high stability. These results indicated that the α-Ni(OH)2 nanosheets can be used as a high performance electrochemical material for application in supercapacitor.

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