Synthesis of the sandwich-type MnMoO4@NiMoO4@Mn2O3 core-shell nanostructured materials and their application in the high-performance battery-supercapacitor hybrid devices

We synthesized the sandwich-type of MnMoO4@NiMoO4@Mn2O3 core-shell nanosheet arrays (MMNM) that were grown on nickel foams (NFs) via a two-step controllable hydrothermal reaction. Compared with the previously reported core-shell materials, the structure of MMNM series materials was more unique and abundant, and its application prospect was extremely broad. The electrochemical properties of the prepared electrodes were tested in a three-electrode system, among which the MMNM-2 electrode exhibited the best electrochemical performance. The battery-supercapacitor hybrid device (MMNM-2 //AC BSH device) fab-ricated with MMNM-2 and activated carbon (AC) as the positive electrode and the negative electrode, re-spectively, achieved a high energy density of 49.99 W h kg-1 at a power density of 877.87 W kg-1. Moreover, the MMNM-2//AC BSH device exhibited better cycling stability than most previously reported BSH devices, with a high capacity retention of 96.03% after 20,000 cycles at a current density of 10 mA cm-2. The ex-cellent electrochemical performance indicated the potential application of MMNM-2 in new energy storage devices. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

Sandwich-type MnMoO4@NiMoO4@Mn2O3 core-shell nanosheet arrays (MMNM) were synthesized on nickel foams via a two-step controllable hydrothermal reaction. The MMNM series materials had a unique and abundant structure with broad application prospects. Among them, the MMNM-2 electrode exhibited the best electrochemical performance, and the battery-supercapacitor hybrid device (MMNM-2 // AC BSH device) achieved a high energy density and excellent cycling stability.