Surfactant assisted self-assembly of NiCo phosphate with superior electrochemical performance for supercapacitor

摘要

A novel electrode material, NiCo phosphate, was prepared by a facile surfactant assisted self-assembly method at room temperature. The as-prepared transition metal phosphate (SDBS-Ni2Co1PO4) with amorphous and mesopores morphology exhibits superior electrochemical capacitive behaviors. The specific capacitance was 191.6 mAh g(-1) at 0.5 A g(-1) and it maintained 142.5 mAh g(-1) at 10 A g(-1). More importantly, the material possessed superior cyclic stability (77% of retention after 2000 times charge-discharge at 10 A g(-1)). Moreover, the SDBS-Ni2Co1PO4//Graphene asymmetric supercapacitor was assembled in aqueous KOH electrolyte, and possessed high energy density (36.5 Wh kg(-1) at 150 Wkg(-1)). This work provides a simple and green way to prepare cheap transition metal phosphate as efficient electrode material in pseudocapacitor.