Тип публикации: статья из журнала
Год издания: 2015
Идентификатор DOI: 10.1134/S1023193515080091
Ключевые слова: electrochemical capacitor, mesostructure, activation, template-assisted synthesis, electric double layer, Activated carbon, Capacitance, Capacitors, Chemical activation, Electrochemical impedance spectroscopy, Electrodes, Electrolytes, Electrolytic capacitors, Gas adsorption, Mesoporous materials, Microporosity, Specific surface area, X ray diffraction, Capacitance characteristics, Electrochemical characteristics, Mesoporous carbon materials, Mesostructures, Non-aqueous electrolytes, Electrochemical electrodes
Аннотация: Mesostructured carbon materials for electrodes of electrochemical capacitors are synthesized by the method of template-assisted synthesis. To enhance their capacitance characteristics, their surface is chemically activated by etching in fused KOH and NaOH. The structure of materials is studied by the meth-ods of X-ray diffraction aПоказать полностьюnd gas adsorption. Their electrochemical characteristics are studied within the composition of electrodes for electrochemical capacitors with aqueous and nonaqueous electrolytes by impedance spectroscopy. It is found that the chemical activation approximately doubles the carbon specific surface area (up to 1700 m(2)/g), decreases the amount of the mesostructured phase, and leads to spatial disorientation of carbon rods. Moreover, the specific capacitance of mesoporous carbon materials increases from 90 to 160 F/g. An increase in the alkali concentration increases both the specific surface area of samples and their specific capacitance in aqueous and nonaqueous electrolytes, which correlates with the shift of the micropore-to-mesopore ratio of the carbon matrix to micropores. It is shown that the nature of metal hydroxide affects the structural parameters of activated carbon materials which determine the relationship between the specific capacitance and the polarization current.
Журнал: RUSSIAN JOURNAL OF ELECTROCHEMISTRY
Выпуск журнала: Vol. 51, Is. 8
Номера страниц: 764-772
ISSN журнала: 10231935
Место издания: NEW YORK
Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER