3D hierarchical core–shell spiny globe shaped Co2P@Ni2P/NiCo2O4@CoO for asymmetric supercapacitors

Core–shell spiny globe shaped Co 2 P@Ni 2 P/NiCo 2 O 4 @CoO–NF (CNNCC–NF) was constructed. The CNNCC–NF shows ultrahigh areal capacitance (10.11 F cm −2 at 2 mA cm −2 ). The CNNCC–NF//AC–NF device exhibits a high energy density and excellent stability.