Template-free preparation of vertically-aligned Mn3O4 nanorods as high supercapacitive performance electrode material

Publication date: 31 July 2017
Source:Thin Solid Films, Volume 634
Author(s): Mustafa Aghazadeh, Maryam Asadi, Mohammad Reza Ganjali, Parviz Norouzi, Behrouz Sabour, Mehdi Emamalizadeh
Pulsed base (OH⁻) electrogeneration was applied to the cathodic electrodeposition of manganese oxide from chloride bath for the first time, and Mn3O4 nanorods were prepared. The deposition experiments were performed under a pulse current mode in a typical on-times and off-times (ton =10 ms and toff =50 ms) at a peak current density of 1mAcm⁻² (Ia =1mAcm⁻²). The structural characterizations with XRD and FTIR revealed that the prepared sample is composed of tetragonal crystal phase of Mn3O4. Morphological evaluations by SEM further proved that the prepared Mn3O4 is made up of large scale and vertically aligned one-dimensional (1D) nanorods with uniform shapes and an average diameter of 50nm. The electrochemical measurements through cyclic voltammetry (CV) and charge-discharge techniques revealed that the prepared Mn3O4 nanorods have an excellent capacitive behavior, with the specific capacitances as high as 321, 292, 264, 222, 187 and 132Fg⁻¹ at the scan rates of 2, 5, 10, 25, 50 and 100mVs⁻¹, respectively. The excellent long-term cycling stabilities of 91.7%, 83.4%, and 75.7% were also observed after 1000 charge–discharge cycles at the current densities of 1, 5 and 10Ag⁻¹, respectively.