Hierarchical design of Ni(OH)2/MnMoO4 composite on reduced graphene oxide/Ni foam for high- performances battery-supercapacitors hybrid device

Design and synthesis advanced battery-type electrode materials with outstanding electrical conductivity and remarkable theoretical specific capacity are crucial to enhance the comprehensive performances for battery-supercapacitors (SCs). Herein, Ni(OH)(2)/MnMoO4 composite on reduced graphene oxide/Ni foam (rGO/NF) was successfully fabricated through the hydrothermal method and potentiostatic electrodeposition (Ni(OH)(2)/MnMoO4/rGO/NF). The unique honeycomb structure and the efficient synergistic effects among MnMoO4 and Ni(OH)(2) of the as-prepared battery type electrode, as well as outstanding electronic conductivity of the reduced graphene oxide, were beneficial to the enhanced electrochemically active sites and increased specific capacity. Ni(OH)(2)/MnMoO4/rGO/NF composite employed for SCs yielded the maximum specific capacity of 1329.1 C g(-1) and a superb cycle property of 86.8% during 5000 cycles. Furthermore, the battery-supercapacitor hybrid (BSH) device with the Ni(OH)(2)/MnMoO4/rGO/NF and active carbon (AC) as-prepared samples showed the energy density of 61.4 W h kg(-1) at the power density of 428.4 W kg(-1). The capacity retention of the as-fabricated hybrid device reached 96.4% over 7000 cycles. Those consequences tested that the Ni(OH)(2)/MnMoO4/rCO/NF composite should be the promising category of battery-type electrodes materials of the next generation energy storage devices for the high-performances SCs. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The Ni(OH)(2)/MnMoO4/rGO/NF composite electrode material showed enhanced electrochemical activity and capacity, leading to superior performance in supercapacitors. The hybrid device achieved high energy density and capacity retention over a large number of cycles, making it a promising candidate for next-generation energy storage devices.