A structurally controllable flower-shaped phosphide derived from metal-organic frameworks for high-performance supercapacitors

In this study, the flower-shaped phosphide (C/NiCoP) has been synthesized by the solvothermal method and phosphorization. The results indicate that the morphology of the samples can be modulated by varying the metal ratio of the precursor (nickel and cobalt-based metal-organic frameworks, NiCo-MOFs). The SEM and TEM analysis prove that the obtained C/NiCoP has a very complete flower-like structure, when the molar ratio of nickel and cobalt is 1: 1. The electrochemical test shows that the specific capacitance of C/NiCoP is 773 C/g at 1 A/g. The asymmetric supercapacitor (ACS) consisting of activated carbon (AC) and C/NiCoP offers a high energy density of 62.4 Wh kg −1 at a power density of 850.0 W kg −1 . The exceptional electrochemical performance is attributed to this unique structure, which exposes more active sites. Additionally, many voids are generated on the surface of C/NiCoP along with the Kirkendall effect, allowing for rapid ion transmission to enhance the Faraday reaction between the electrode and the electrolyte.