Abstract
Composites of Ni(OH)2 and microwave-exfoliated graphite oxide (MEGO) with component ratios of 20:80, 35:65, and 50:50 have been synthesized by treating a water mixture of MEGO with NiSO4 × 7H2O in a KOH solution. The structure and properties of the composites obtained have been studied using IR spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. MEGO is known to possess high stability during the charge–discharge process and relatively low specific capacitance. On the contrary, Ni(OH)2 possesses a high specific capacitance and a low stability during the charge–discharge process. Our experimental results show that the addition of MEGO to Ni(OH)2 increases the stability of the composite electrode under a charge–discharge process. Some increase in the specific capacitance during the cycling have been observed for the composites with the 35:65 and 50:50 ratios. Moreover, the specific capacitance of the 35:65 composite matches the specific capacitance of pure Ni(OH)2 after 100 cycles.
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Acknowledgments
This work has been partially supported by the RF Ministry of Education and Science (State Assignment No. 11.1797.2014/K). The work was and performed by using the equipment of the Joint Research Center “Material Science and Metallurgy” at the National University of Science and Technology “MISIS” (project ID: RFMEFI59414X0007).
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Shulga, Y.M., Baskakov, S.A., Baskakova, Y.V. et al. Influence of the content on properties of microwave-exfoliated graphite oxide and Ni(OH)2 composites. Appl. Phys. A 122, 393 (2016). https://doi.org/10.1007/s00339-016-9824-1
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DOI: https://doi.org/10.1007/s00339-016-9824-1