Abstract
Spherical manganese carbonate (MnCO3) nanoparticles were prepared from manganese acetate by means of supercritical carbon dioxide (scCO2). The variation of morphology according to temperature, pressure, and solvent composition was studied. Quite uniformly sized MnCO3 nanoparticles were effectively produced in a short period of time with the aid of supercritical fluid. Furthermore, porous manganese oxide (MnOx) nanoparticles with high surface area were obtained via calcination process of MnCO3 nanoparticles, and its performance as a supercapacitor was investigated. The porous manganese oxide nanoparticles showed a high specific capacitance of 322 Fg−1 at 1 Ag−1 with excellent rate capability and cyclic stability. This study provides a new approach for the facile and eco-friendly fabrication of MnCO3 nanoparticles using scCO2 and their conversion to porous MnOx for supercapacitor application.
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Acknowledgements
This study was supported by the Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 20142010102690), and by the Basic Science Research Program through the National Research Foundation of Korea Grant funded by the Ministry of Science, ICT & Future Planning (2009-0083540). This study was also supported by the Industrial Strategic Technology Development program (10047780, Development of high power VSS for extreme temperature) funded by the Ministry of Trade, Industry and Energy of Korea.
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Sang Ha Lee and Youngtak Kwon have contributed equally to this work.
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Lee, S.H., Kwon, Y., Park, S. et al. Facile synthesis of MnCO3 nanoparticles by supercritical CO2 and their conversion to manganese oxide for supercapacitor electrode materials. J Mater Sci 50, 5952–5959 (2015). https://doi.org/10.1007/s10853-015-9133-7
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DOI: https://doi.org/10.1007/s10853-015-9133-7