▎ 摘　　要

Mn3O4/graphene nanocomposites with different ratios (M1G1, M1G3 and M3G1) were successfully synthesized by a deposition-solvothermal process. The composites were well characterized with different tools such as TEM-SAED, XRD, FTIR, Raman techniques, and N2 adsorption. The electrochemical characteristics of the nanocomposites were evaluated using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and impedance spectroscopy in comparison to pure Mn3O4. Mn3O4 nanoarchitectures (15 nm) and their interaction with graphene, indicating the well-dispersion of Mn3O4 in graphene, were confirmed via TEM-SAED. The M3G1 composite, which contains mostly Mn3O4 and Mn2O3 moieties, has the largest specific capacitance of 490 F g-1 at current density of 0.25 A g-1, the highest power density of 2412 W kg-1, a considerable energy density of 45 Wh kg-1, and exceptional cycling stability of 0% loss after 1000 cycles. The quick charge diffusion mechanism, high surface area, and pore volume were all influencing factors.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).