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Издательство:
Дата издания
01.03.2023На каком языке издана
ISSN
0925-9635Область исследования
Тип исследования
Аннотация (краткое описание)
In this work, an amorphous silica powders (1-SiO2 and 2-SiO2) and activated carbon with few-layer graphene were derived from rice husk using simple and efficient process. Synthesized samples were characterized by means of TGA SEM, XRD, XRF, nitrogen low-temperature adsorption/desorption, Raman, and EDAX. Rice husk calcination yields in 18 and 14 wt% of 1-SiO2 and 2-SiO2, correspondingly. Carbonization of rice husk followed by activation yielded about 11 wt% of activated carbon with large specific surface area (SBET = 3292 m2 g−1). Feasibility of resulting materials as anode materials for Li-ion batteries grounded on a high theoretical capacity of silica and high charge/discharge stability of activated carbon. We present here a 2-SiO2 material with large specific surface area of 980 m2 g−1, of high purity above 99 %, and large pore volume (1.20 cm3 g−1), which results in a reversible capacity of about 841 and 442 mAh g−1 (1st and 50th cycle) with coulombic efficiency higher than 95 %. Activated carbon demonstrated the highest initial discharge specific capacity and stable reversible capacity after 50 cycles as 1462 and 477 mAh g−1 (1st and 50th cycle), and coulombic efficiency higher than 90 %. © 2023DOI
10.1016/j.diamond.2023.109759Тип публикаций
Практическое значение
The practical significance of this study lies in demonstrating a simple and efficient method for producing high-purity amorphous SiO₂ and high-surface-area activated carbon from rice husk waste for use in lithium-ion battery anodes. The obtained materials show high reversible capacity, good cycling stability, and high coulombic efficiency, indicating their potential to replace or complement conventional graphite anodes. These results support the development of low-cost, sustainable, and high-performance electrode materials for next-generation energy storage systems.Квартиль
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SCImago (Scopus)Impact Factor
6Количество цитирований
20Данный документ располагается в коллекциях
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