Investigation on electrochemical performance of Hausmannite Mn3O4 nanoparticles by ultrasonic irradiation assisted co-precipitation method for supercapacitor electrodes

Publication date: Available online 24 July 2017 Source:Journal of Taibah University for Science Author(s): R. Tholkappiyan, A.Nirmalesh Naveen, K. Vishista, Fathalla Hamed Spinel type-manganese oxide (Mn3O4) nanoparticles were synthesized by ultrasonic irradiation assisted co-precipitation method using PEG and NaOH. The formation of tetragonal hausmannite phase (Mn3O4) with spinel structure was confirmed from XRD and FTIR studies. The average crystallite size of Mn3O4 nanoparticles was determined from Scherrer formula (39.9nm) and Williamson-Hall relation (36.5nm). The presence of elements, overall oxidation state of manganese (Mn2+, Mn3+ and Mn4+) and chemical composition of these nanoparticles were determined from Mn 2p, Mn 3s and O 1s spectra using XPS. The spherical shaped morphology of these nanoparticles was analyzed by SEM. The expected chemical composition of Mn3O4 nanoparticles was analyzed by EDS. The electrochemical performance of these Mn3O4 nanoparticles was studied by CV, CP and AC impedance analysis. The maximum specific capacitance of Mn3O4 nanoparticles was found to be 296F/g at a current density of 1A/g2. Nyquist plot shows lower value of resistance that indicates the good electrical conductivity of the Mn3O4 electrode, which accounts for the improved electrochemical performance of the supercapacitors. Hence, the use of surfactant and presence of ultrasonic irradiation in the synthesis process plays a dominant role in the electrochemical performance of...
Source: Journal of Taibah University for Science - Category: Science Source Type: research