Development of asymmetric device using Co3(PO4)2 as a positive electrode for energy storage application

A facile method for synthesis of cobalt phosphate (Co-3(PO4)(2)) using sonic-waves irradiation. The synthesised Co-3(PO4)(2) samples are exhibited amorphous nature with anisotropic nano/micro rectangular morphologies. The synthesized Co-3(PO4)(2) samples with diverse sonication times (10min, 1h, 2h and 3h) revealed the specific capacity of 180.40, 203.40, 171.58 and 153.30C/g at a current density of 2A/g. An improved electrochemical activities of Co-3(PO4)(2) is observed with the sonication time of 1h, which may due to the influence of fewer aggregation, lesser flakes damage and provide a more reactive sites for rapid diffusion of the electrolyte ions into the electrode surface. A fabricated supercapattery device using Co-3(PO4)(2) (1h sample) as positive and activated carbon as negative electrodes, where revealed the specific capacity of 174C/g at a current density of 0.4A/g with a specific energy and power of 35.5Wh/kg and 293.9W/kg.