Influence of the content on properties of microwave-exfoliated graphite oxide and Ni(OH) sub(2) composites

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2016-04, Vol.122 (4), p.1-8
• Main Authors: Shulga, Y M, Baskakov, SA, Baskakova, Y V, Shulga, N Y, Skryleva, E A, Parkhomenko, Y N, Krivenko, A G, Belay, K G, Gutsev, G L
• Format: Article
• Language: English
• Subjects: Capacitance; Cycles; Electrodes; Graphite; Infrared spectroscopy; Oxides; Stability; X-rays
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-016-9824-1

Composites of Ni(OH) sub(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 NiSO sub(4) 7H sub(2)O 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) sub(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) sub(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) sub(2) after 100 cycles.