Abstract
Two-dimensional Mg-substituted cobalt hydroxides (CoxMgy(OH)z) with different crystal phases were synthesized via a facile reaction of magnesium (Mg) powder and cobalt aqueous solution. The phases of CoxMgy(OH)z (amorphous phase and β phase) were controlled by adjusting the cobalt salt precursors. The obtained hybrid amorphous CoxMgy(OH)z (a-CoxMgy(OH)z) showed excellent specific capacitance (662.2 F g−1, 1 A g−1) than β phase CoxMgy(OH)z (β-CoxMgy(OH)z) and pure Co(OH)2 (p-Co(OH)2). Additionally, the hybrid supercapacitor assembled with a-CoxMgy(OH)z and the activated carbon showed high specific capacitance (77.8 F g−1, 1 A g−1) and ultrahigh cycling stability with 99.7% retention of the first capacitance at 10 A g−1 after 5000 cycles.
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Funding
This work was supported by the National Natural Science Foundation of China (grant no. 51872109 and 21201072), China Postdoctoral Science Foundation (grant no. 2013 T60517), the Natural Science Foundation of Jiangsu Province (grant no. BK2012241), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (grant no. 18KJA150002), Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials (grant no. JSKC180011), and National Training Programs of Innovation and Entrepreneurship for Undergraduates (201910323025Z).
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Wang, J., Rui, J., Yin, J. et al. Phase-controlled synthesis of Co-Mg hydroxide for high-performance hybrid supercapacitors. Ionics 27, 351–360 (2021). https://doi.org/10.1007/s11581-020-03805-0
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DOI: https://doi.org/10.1007/s11581-020-03805-0