Facile synthesis of self-supported core-shell Cu2O@MnO2 octahedral microcrystals and their application in supercapacitors

Novel self-supported core-shell Cu 2 O@MnO 2 octahedral microcrystals directly growing on the nickel foam have been synthesized through a facile solvothermal reduction deposition process followed by a hydrothermal reaction. The core-shell heterostructures were constructed through growing MnO 2 nanosheets on the surface of Cu 2 O octahedral microcrystal. Based on the synergetic effects from both the cores and shells, such self-supported core-shell Cu 2 O@MnO 2 octahedral microcrystals as binder-free electrode materials exhibited a high specific capacitance of 371 F g −1 at 0.5 A g −1 and excellent cycling stability with 95.8% of capacitance retention after 2000 cycles. These findings suggest their potential applications as a promising electrode material for supercapacitors.