Investigation on structural, morphological, and optical properties of copper molybdate nanorods for supercapacitor applications
摘要
Transition metal molybdates are good choice for electrochemical applications because of their desirable chemical and physical characteristics. In this study, copper molybdate (CuMoO4) nanorods were effectively prepared by hydrothermal technique and explored for supercapacitor applications. The influence of hydrothermal reaction times on the structural, morphological, and optical properties of the CuMoO4 nanorods were studied. The anorthic crystal structure of CuMoO4 nanorods along better crystallinity was confirmed by XRD analysis. The FESEM and HRTEM images showed that the synthesized sample exhibited nanorod structure. EDAX analysis showed the presence of elements related to CuMoO4. FTIR spectroscopy proved that the characteristic bonds of Cu–O and Mo–O were observed below 1000 cm−1. BET studies showed a calculated surface area of 45.4 m2/g related to the CuMoO4 nanorods. The oxidation state of Cu was +2 identified by XPS analysis. The optical bandgap values decreased from 2.25 to 2.07 eV with increasing reaction times. Cyclic voltammetry measurement revealed that charge storage in CuMoO4 exhibited pseudocapacitive behavior and nanorod structures achieved an excellent specific capacitance value of 156 Fg−1 at a low scan rate. Based on this study, the obtained CuMoO4 nanorod electrodes could be a promising electrode material for energy storage devices.