Synthesis of 3D Mesoporous Wall-Like MnO2 with Improved Electrochemical Performance

Manganese dioxide (MnO2) with mesoporous framework self-assembled by ultrathin nanosheets was synthesized via a facile hydrothermal strategy without any binders and substrates. The wall-like structure of this electrode material for supercapacitors can provide more attaching points for active material and shorten the diffusion paths of electrons and ions, leading to a high specific capacitance (SC) of 400 F g−1 at current density of 1 A g−1 and the good cyclic stability up to 3000 cycles. Meanwhile, the relationships among structure, specific surface area, pore size and electrochemical properties have been discussed. It indicated that three-dimensional (3D) wall-like δ-MnO2 is a promising electrochemical electrode candidate for supercapacitors.