Platanus Fruit-Like Nickel Cobalt Ammonium Phosphate/MWCNTs Composite Grown on Nickel Foam for High-Performance Supercapacitors

Abstract

Platanus fruit-like nickel cobalt ammonium phosphate/MWCNTs composites for high-performance supercapacitors were successfully prepared by a two-step hydrothermal method using NiSO[Formula: see text]6H2O, CoSO[Formula: see text]7H2O, (NH4)H2PO4 and MWCNTs as raw materials, respectively. The effects of MWCNTs addition on the structure and properties of the composites were investigated. The results showed that when the doped amount of MWCNTs is 7.3[Formula: see text]wt.%, the as-prepared NCAP/M7.3 composite presented an obvious platanus fruit likeness, its surface is rough and porous with a diameter of 3–5[Formula: see text][Formula: see text]m. Compared with the other MWCNTs contents, the NCAP/M7.3 electrode obtained under this condition showed the best capacitive performance. The discharge specific capacity was up to 1270[Formula: see text]F[Formula: see text]g[Formula: see text] at current density of 1[Formula: see text]A[Formula: see text]g[Formula: see text], which remains to be 902[Formula: see text]F[Formula: see text]g[Formula: see text] even at a high density of 10[Formula: see text]A[Formula: see text]g[Formula: see text]. The results show that the target sample can be the ideal electrode material for supercapacitor.