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

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 .