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  • Open Access


    Preparation of Eco-Friendly High-Performance Manganese Dioxide Supercapacitors by Linear Sweep Voltammetry

    Junshan Zhao1,#, Yihan Shi1,#, Ming Zhang1, Liu Zhang1, Xumei Cui1, Xinghua Zhu2, Jitong Su1, Dandan Jing1, Dingyu Yang1,*

    Journal of Renewable Materials, Vol.11, No.1, pp. 79-91, 2023, DOI:10.32604/jrm.2023.022030

    Abstract In this paper, the non-polluting, non-toxic, and eco-friendly material-MnO2 electrodes were deposited on three-dimensional porous nickel (Ni) foam by linear sweep voltammetry, and the entire electrodeposition process did not require sintering of the material, which was fast and convenient while avoiding unnecessary energy consumption and thus was environmentally friendly. Scanning electron microscopy (SEM) and transmission electron microscopy were used to examine the surface and microscopic characteristics of each sample (TEM). Chronoamperometry (CA), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) were then used to determine the electrochemical characteristics of the manufactured samples. The More >

  • Open Access


    Effect of Doped Alkali Metal Ions on the SO2 Capture Performance of MnO2 Desulfurization Materials at Low Temperature

    Xing Li1,3, Yugo Osaka2,*, Hongyu Huang1, Takuya Tsujiguchi2, Akio Kodama2

    Journal of Renewable Materials, Vol.9, No.9, pp. 1541-1553, 2021, DOI:10.32604/jrm.2021.015514

    Abstract Sulfur dioxide (SO2) emissions from diesel exhaust pose a serious threat to the environment and human health. Thus, desulfurization technology and the performance of desulfurization materials must be improved. In this study, MnO2 was modified with various alkali metal ions using the impregnation method to enhance its SO2 capture performance. The composites were characterized intensively by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction spectroscopy, and Brunauer-Emmett-Teller theory. The SO2 capture performance of these composites were measured via thermogravimetry, and the effect of doping with alkali metal ions on the SO2 capture performance of MnO2 was investigated. Results… More >

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