Controllable synthesis of flower-like MnV2O6?2H2O microsphere as electrode for advanced hybrid supercapacitors

Exploring novel electrode materials with rational morphology and structure is critical for the development of supercapacitors. In this paper, flower-like MnV2O6 center dot 2H2O microspheres have been controllably synthe-sized through a methanol and ethylene glycol assisted solvothermal method. Especially, the methanol solvent (structure-directing agent) induces the assembly process of the recrystallized nanosheets into flower-like microspheres, and the assistance of ethylene glycol (chelating agent) can effectively reduce the microsphere size through the strong complexation between metal ions and ethylene glycol. Benefiting from the unique three-dimensional (3D) hierarchical porous structure, the flower-like MnV2O6 center dot 2H2O micro-sphere electrode has an outstanding charge capacity (374.1 C center dot g-1 at 1 A center dot g-1), good rate capability, and ex-cellent electrochemical stability (92.7 % capacity retention after 10,000 cycles). After being assembled into supercapacitor, the fabricated MnV2O6 center dot 2H2O//AC device exhibits a superior energy density of 35.7 Wh center dot kg-1 at the power density of 571.7 W center dot kg-1. These excellent properties demonstrate its potential application prospect in supercapacitor. (c) 2022 Elsevier B.V. All rights reserved.