Mustafa Ghulam, Mehboob Gohar, Khisro Said Nasir, Javed Muhammad, Chen Xinman, Ahmed M Shafiq, Ashfaq J M, Asghar G, Hussain Shahnwaz, Rashid Amin Ur, Mehboob Ghazanfar
Department of Physics, University of Kotli, Kotli, Pakistan.
School of Materials Science and Engineering, South China University of Technology, Guangzhou, China.
Front Chem. 2021 Aug 18;9:717074. doi: 10.3389/fchem.2021.717074. eCollection 2021.
A simplified sol-gel method that can be scaled up for large-scale production was adopted for the preparation of manganese oxide nanocrystals. Prepared MnO exhibited micron-sized particles with a nanoporous structure. In the present study, a simple and low-cost strategy has been employed to fabricate nanoporous MnO with an increased surface area for an electrode/electrolyte interface that improved the conduction of MnO material. The crystal phase and morphology of the prepared material was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The prepared electrode materials were deposited on a nickel foam substrate to investigate the electrochemical properties. The galvanostatic charge/discharge (GCD), cyclic voltammetry (CV), and complex impedance studies confirmed excellent specific capacitance and capacitive behavior of the prepared material. The synthesized MnO/graphene composites exhibited an excellent specific capacitance of 391 F/g at a scan rate of 5 mV/S. Moreover, a specific capacitance of 369 F/g was recorded at a current density of 0.5 A/g using the galvanostatic charge/discharge test. The high porosity of the materials provided a better electrolyte-electrode interface with a larger specific area, thus suggesting its suitability for energy storage applications.
采用一种可扩大规模用于大规模生产的简化溶胶-凝胶法制备氧化锰纳米晶体。制备的MnO呈现出具有纳米多孔结构的微米级颗粒。在本研究中，采用了一种简单且低成本的策略来制备具有更大表面积的纳米多孔MnO，用于电极/电解质界面，从而改善了MnO材料的导电性。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）对制备材料的晶相和形貌进行了研究。将制备的电极材料沉积在泡沫镍基板上以研究其电化学性能。恒电流充放电（GCD）、循环伏安法（CV）和复阻抗研究证实了制备材料具有优异的比电容和电容行为。合成的MnO/石墨烯复合材料在扫描速率为5 mV/S时表现出391 F/g的优异比电容。此外，使用恒电流充放电测试在电流密度为0.5 A/g时记录到比电容为369 F/g。材料的高孔隙率提供了具有更大比表面积的更好的电解质-电极界面，因此表明其适用于储能应用。
