Newly Design Porous/Sponge Red Phosphorus@Graphene and Highly Conductive Ni2P Electrode for Asymmetric Solid State Supercapacitive Device With Excellent Performance

Three-dimensional phosphorus@graphene is established as a negative electrode and Ni2P as a positive electrode for asymmetric supercapacitor. The supercapacitor shows higher performance than those of all Ni2P-based electrodes, which has an extended operating voltage window of 1.6 V, energy density of 41.66 Wh Kg−1 and rate capability of up to 88% after 5000 cycles.