Abstract
Transition metal oxides have achieved tremendous attention in the field of supercapacitor devices due to their outstanding structural properties and capacitive behavior. Herein, a porous a-MoO_3 microspheres (A-SMO) were synthesized with the aid of CrCl_3.6H_2O via a facile hydrothermal reaction and subsequent annealing treatment. The results showed that CrCl_3.6H_2O plays a crucial role in manipulating morphology and increasing the specific surface area of the as-prepared products. Moreover, annealing treatment could transform the crystal structure from metastable hexagonal M0O_3 to stable orthogonal MoO_3, which is more beneficial for electron storage due to the layered crystal structure. Furthermore, the A-SMO displayed an excellent specific capacitance of 201.4 F g~(-1) compared with the pristine MoO_3 (MO) of 62.0 F g~(-1) and the annealed MO (A-MO) of 186.5 F g~(-1) at 0.2 A g~(-1), when they were directly served as supercapacitor electrodes. This research demonstrates that the as-obtained a-MoO_3 microspheres can serve as promising electrode materials for supercapacitors.
NSTL
Elsevier