Abstract
We present a simple and quick procedure for the one-pot synthesis of manganese oxides under a basic solvothermal condition in the presence of cationic surfactants acting as the template in a 2-butanol/water solution. Three-dimensional spinel-type MnO2 microspheres composed of small nanoparticles have been fabricated for the first time using our method. Their corresponding electrochemical performances in the applications of supercapacitor electrodes exhibit a good specific capacitance (SC) value of ∼190 F/g at 0.5 A/g and excellent SC retention and Coulombic efficiency of ∼100% and ∼95% after 1000 charge/discharge cycles at 1 A/g, respectively. This suggests its potential applications in energy storage devices. Further, we demonstrate that this solvothermal technique enables the morphological tuning of manganese oxides in various forms such as schists, rods, fibers, and nanoparticles. This work describes a rapid and low-cost technique to fabricate novel architectures of manganese oxides having the desired crystal phase, which will highly benefit various supercapacitor applications.
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Acknowledgments
We gratefully acknowledge the financial support from National Science Council of Taiwan (Grant Nos. NSC-101-2113-M-005-014-MY3 and NSC 101-2628-M-007-006). We also appreciate Dr. Lih J. Chen at National Tsing Hua University, Taiwan, for providing technical assistance in HRTEM measurements.
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Ko, WY., Chen, LJ., Chen, YH. et al. Solvothermal synthesis of shape-controlled manganese oxide materials and their electrochemical capacitive performances. Journal of Materials Research 29, 107–114 (2014). https://doi.org/10.1557/jmr.2013.238
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DOI: https://doi.org/10.1557/jmr.2013.238