Приводятся результаты исследования электрохимического диспергирования чешуйчатого графита в серной кислоте. Показано, что наибольшая эффективность диспергирования достигается при использовании крупных фракций графита с размером частиц свыше 200 мкм. Установлено образование при анодном окислении графита структур многослойного оксида графена (ОГ) с толщиной 0.1-1.0 мкм и латеральными размерами до 100 мкм. Идентификация графеновых структур проводилась рентгенофазовым анализом и ИК-Фурье спектроскопией. Показана возможность получения свободных от основы пленок из частиц многослойного ОГ без участия связующего с перспективой применения их для создания гибких электродов суперконденсаторов и ХИТ. Ключевые слова: многослойный оксид графена, электрод, суперконденсатор. Статья опубликована на условиях лицензии Creative Commons Attribution License (CC-BY 4.0)
The results of the studies of the electrochemical synthesis of multilayer graphene oxide were presented, and the possibility of using it as an electrode material of the supercapacitor was shown. In an alcohol suspension the thickness of the particles of multilayer graphene oxide was less than 0.1 µm with an area of more than 100 µm2. The graphene oxide-based electrode has a high specific capacity of 107 F·g−1 and a high charge retention rate of 97% after 5000 cycles. It was shown that the graphene oxide electrode had a maximum specific energy of 8.7 W·h·kg−1 at the current density of 0.1 A·g−1 and had a maximum power of 2291.1 W·kg−1 at the current density of 4 A·g−1. The application of a lithium-thionyl chloride cell with a multilayer graphene oxide cathode on a nickel grid was tested. It was found that graphene oxide synthesized using the electrochemical method is a promising electrode material for creating a symmetric supercapacitor.
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