Facile preparation and characterization of metal phosphate for supercapacitor

Abstract

Abstract In this study, nickel cobalt phosphate ((Ni,Co)(PO4)3) has been developed as a positive electrode in supercapacitors. (Ni,Co)(PO4)3 is synthesized through a phosphorization and carbonization method using NiCo glycerate as a precursor combined with triethyl phosphate (TEP), subsequently an annealing process at 600°C under air conditions. The choice of solvent like hexanol has a significant influences on the morphology of nickel cobalt phosphate ((Ni,Co)(PO4)3), leading to the formation of cracker-like structures. Additionally, the resulting product exhibits an amorphous phase, indicating the absence of a well-defined crystalline arrangement. The electrochemical performance evaluation shows the peak from oxidation and reduction reactions at scan rate 5 mVs−1 until 100 mVs−1. Following that the specific capacitance reaches 743 Fg−1 at current density 1 Ag−1.