Electrodeposition Synthesis of Coral-like MnCo Selenide Binder-Free Electrodes for Aqueous Asymmetric Supercapacitors

Bimetallic selenide compounds show great potential as supercapacitor electrode materials in energy storage and conversion applications. In this work, a coral-like MnCo selenide was grown on nickel foam using a facile electrodeposition method to prepare binder-free supercapacitor electrodes. The heating temperature was varied to tune the morphology and crystal phase of these electrodes. Excellent electrochemical performance was achieved due to the unique coral-like, dendritic- dispersed structure and a bimetallic synergistic effect, including high specific capacitance (509 C g-1 at 1 A g-1) and outstanding cycling stability (94.3% capacity retention after 5000 cycles). Furthermore, an asymmetric supercapacitor assembled with MnCo selenide as the anode and active carbon as the cathode achieved a high specific energy of 46.2 Wh kg-1 at 800 W kg-1. The work demonstrates that the prepared coral-like MnCo selenide is a highly promising energy storage material.

Automated summary

Bimetallic selenide compounds, particularly the coral-like MnCo selenide, prepared using a facile electrodeposition method on nickel foam, exhibit excellent electrochemical performance for supercapacitor electrodes. The unique coral-like and dendritic-dispersed structure, as well as the bimetallic synergistic effect, contribute to high specific capacitance (509 C g-1 at 1 A g-1) and outstanding cycling stability (94.3% capacity retention after 5000 cycles). Furthermore, an asymmetric supercapacitor composed of MnCo selenide anode and active carbon cathode achieves a high specific energy of 46.2 Wh kg-1 at 800 W kg-1. These findings highlight the promise of coral-like MnCo selenide as an energy storage material.