Facile synthesis of a metal–organic framework-derived Mn2O3 nanowire coated three-dimensional graphene network for high-performance free-standing supercapacitor electrodes

摘要: This study presents a facile strategy to construct three-dimensional graphene network (3DGN) and metal–organic framework (MOF)-derived metal oxide composites as free-standing electrodes for supercapacitors the first time. A Mn-based MOF is grown in situ on 3DGN substrate through simple solution immersion method, then high-temperature treatment has resulted formation of decorated with Mn2O3 nanowire stacking flower-like morphology. The structure morphology as-prepared samples are investigated by powder X-ray diffraction, Raman spectroscopy, photoelectron spectroscopy analysis, scanning electron microscopy, elemental mapping, transmission microscopy. designed 3DGN/Mn2O3 electrode material exhibits high specific capacitance 471.1 F g−1 (0.21 cm−2) at 0.2 g−1, good rate capability 57.3% 5 relative initial value excellent long-cycle stability without decaying after 1800 charge–discharge cycles. remarkable electrochemical performances originate from synergistic effect electrical conductivity large surface area along superior pseudocapacitance activity nanowires. result suggests that 3DGN/MOF-derived promising efficient binder-free materials high-performance supercapacitors.