Abstract
A novel improved molten-salt synthesis was employed to synthesize the Ni(OH)2/NiOOH composite by using a mixed precursor of nickel nitrate and nickel acetate. Here, the molted salt was used as reactant for the first time, rather than a reaction medium in the conventional molten salt method. The synthesized Ni(OH)2/NiOOH composite possesses loose lamellar structure, which could facilitate the transport of electrolyte ions during the rapid charge/discharge process. The capacitive properties of the composite were evaluated by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy techniques in 6M KOH aqueous electrolyte. Electrochemical results shown that the Ni(OH)2/NiOOH composite which obtained with this nickel acetate assisted route was endowed with high pseudocapacitance performance of 1425Fg−1 at 2Ag−1. The material exhibited moderate rate capability, high energy density of 59.85Whkg−1 and high power density of 0.55kWkg−1.
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