In situ growth of manganese oxide nanosheets over titanium dioxide nanofibers and their performance as active material for supercapacitor.

In recent years, electrochemical energy devices, i.e. batteries, fuel cells, solar cells, and supercapacitors, have attracted considerable attention of scientific community. The architecture of active materials plays a crucial role for improving supercapacitors performance. Herein, titanium dioxide (TiO) nanofibers (1D) have been synthesized by electrospinning process and used as a backbone to manganese dioxide (MnO) nanosheets (2D) growth through hydrothermal method. This strategy allows the obtaining of 1D/2D heterostructure architecture, which has demonstrated superior electrochemical performance in relation to pristine MnO. The highest electrochemical performance is due to the synergic effect between the metal oxides, where TiO nanofibers provide electrochemical stability for active MnO phase. Thus, the designed TiO@MnO structure can reach maximum specific capacitance of 525 F·g at a current density of 0.25 A·g, and it demonstrates an excellent stability by retaining 81% of the initial capacitance with coulombic efficiency of 91%. Therefore, the novel architecture of TiO@MnO based on nanofibers and nanosheets exhibits superior electrochemical properties to be used in supercapacitor applications.