Growth of NiMoO4@MnCo2O4 core-shell structured double metal oxide composite electrodes on carbon cloth for flexible asymmetric supercapacitors

The performance of supercapacitors can be improved by rationally optimizing the microstructure of materials. In this study, an electrode fabricated from bimetallic oxide using a core-shell structure has been investigated. MnCo2O4 nanosheet arrays were electrodeposited onto NiMoO4-grown carbon cloth to enhance charge migration and diffusion, thereby, improving supercapacitor electrochemical performance. Electrochemical measurements demonstrate that the composite of two bimetallic oxides generating a core-shell structure exhibits a higher capacitance than a single bimetallic oxide. This indicates the feasibility of utilizing the electrodeposition process to optimize the core-shell structure by combining the advantages of different metal oxides. Further investigation was conducted to ascertain the impact of the number of electrodeposition cycles by cyclic voltammetry on the capacitance performance of the anode materials. After five deposition cycles, the results displayed the best capacitance performance. Asymmetric supercapacitors (ASCs) were then fabricated using NiMoO4@MnCo2O4/CC as the anode and activated carbon as the cathode (AC/CC). The device exhibits a power density of 2.1 mW cm−2 and an specific energy of 84 μWh cm−2 (3 mA cm−2) at 1.6 V. After 5000 cycles, the charge/discharge cycle retention rate is 84 %. The device provides technical support for smart wearable textiles by effectively resisting external forces. [Display omitted] •Preparation of MnCo2O4 shell materials by electrodeposition•NiMoO4@MnCo2O4 electrode material has excellent electrochemical properties.•NiMoO4@MnCo2O4//AC asymmetric supercapacitors have high energy density.