Preparation of Flexible Substrate Electrode for Supercapacitor With High-Performance MnO(2) Stalagmite Nanorod Arrays

A large-area MnO(2) stalagmite nanorod arrays (SNAs) growing vertically on flexible substrates were successfully fabricated by an easy heat-electrodeposition method. The large specific capacitance (646.4 F g(−1) at 500 mA g(−1)) and excellent rate capability (42.3% retention with 40 times of increase) indicate that the prepared MnO(2) SNAs flexible electrode has outstanding electrochemical performance. Furthermore, after 5,000 repetitions of CV tests, the overall specific capacitance could retain ~101.2% compared with the initial value meant a long cycling life. These outstanding properties could be ascribed to the effective conductive transport path between Ni substrate and MnO(2) nanorods, and owing to the stalagmite like structure of MnO(2) nanorods, the exposed sufficient active sites are beneficial to the electrolyte infiltration.