Vertically-aligned Mn3O4 Nanorods: Electrochemical Preparation and Characterization

Since manganese oxides have unique electrical and chemical properties, it can be used as an electrode material for capacitors, electrochromic devices, ion-exchangers, and selectiveadsorption material of radio nuclides. Electrochemical supercapacitors are becoming attractive energy storage devices for applications involving high power requirements. There is an increasing interest in the development of advanced electrode materials based on manganeseoxides. Nanostructured manganese oxides have been reported to show a promising as electrodes for lithium secondary batteries and supercapacitors, as well as redox catalysts. The preparation of nanowires and nanorods of metal oxides is of considerable interest. Herein, we reportelectrochemical synthesis of Mn3O4 nanorods and their supercapacitive performance. Deposition experiments were performed in manganese chloride bath and direct current mode with applying 2 mA/cm2. XRD analysis (Fig. 1a) showed that the product is crystalline Mn3O4 phase (JCPDS no.42-1124). SEM observation showed a rod texture with regular arrangement, i.e. vertically-alignarrangement. Fig. 2 shows the supercapacitive performance of the prepared Mn3O4. The specific capacitances of Mn3O4 nanorods were calculated to be 302.1, 285.8, 237.5, 202.1, 168.5 and 118 F g–1 at the scan rates of 2, 5, 10, 25, 50 and 100 mV s−1, respectively (Fig. 2b). These values showed excellent supercapacitive performance of the prepared Mn3O4 nanorods

کلیدواژه ها:

Mn3O4 ، Electrosynthesis ، Nanorods ، Supercapacitors