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Effect and design of Mn2+ doped ZnO nanostructures for photodegradation and energy storage devices
Sivakumar S.,Robinson Yengkokpam 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.12
This paper studies the synthesis of Zn1-xMnxO (x=0.00, 0.03, 0.06) nanoparticles using the co-precipitation method. The structural, morphological and optical properties were characterized by XRD, FTIR, SEM, HR-TEM and UV–Visible DRS analysis. The structural analysis indicated a hexagonal shape with good crystallinity of the samples. The FTIR absorption peaks confrmed the formation of Zn–O bonding. The surface morphology and particle size were observed by SEM and HRTEM analysis. The EDS spectra determined the presence of elements Zn, Mn, and O in the samples. The optical band-gap of Mn-doped nanoparticles decreased with increasing concentration from 3.27 eV to 3.09 eV. The photocatalytic activity has been observed with methylene blue (MB) dye under solar irradiation. The Zn0.94Mn0.06O (Mn=0.06) nanoparticles photocatalyst has the highest degradation efciency at 94.08% within 180 min. This result shows that the Mn-doped ZnO enhanced the performance of the photocatalytic activity. In electrochemical performance analysis, undoped and Mn-doped electrodes have been studied 10 mV/s to 100 mV/s scan rate. Mn-doped electrodes decrease the specifc capacitance due to low surface area. However, all the undoped and Mn-doped electrodes possess reduction and oxidation peaks, which is considerable for suitable electrode materials for energy storage devices.