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Дата издания
01.10.2023На каком языке издана
ISSN
2504-477XОбласть исследования
Тип исследования
Аннотация (краткое описание)
In this study, we systematically study the efficient production method and electrochemical characteristics of activated carbons (AC) derived from rice husk (RH) and walnut shell (WS). In particular, the effectiveness of physical activation using carbon dioxide (CO2) was investigated and compared with the more common chemical activation method using potassium hydroxide (KOH). The results show that the KOH–activated samples have remarkable specific capacities, reaching 157.8 F g−1 for RH and 152 F g−1 for WS at 1 A g−1. However, the rate capability of AC obtained via KOH decreases significantly as the scanning rate increases, retaining only 51.5% and 68% of their original capacities for RH–KOH and WS–KOH, respectively, at 20 A g–1. In contrast, CO2–activated samples show a superior rate performance with a capacity retention of 75.6% for WS and 80% for RH at the same current density. In addition, electrochemical impedance spectroscopy (EIS) analysis shows that AC obtained via CO2 has a lower charge transfer resistance compared to its KOH counterparts. CO2–activated RH and WS electrodes show Rct values of 0.1 Ω and 0.24 Ω, respectively, indicating improved ion transport kinetics and surface area utilization. These results highlight the importance of activation techniques in tailoring the electrochemical behavior of biomass–derived carbon. This study not only expands the understanding of the interaction between activation, morphology, and performance but also indicates the potential of CO2 activation as an environmentally friendly and efficient alternative. As the field of sustainable energy storage advances, this work provides valuable guidance for the development of high–performance supercapacitor electrodes with less environmental impact. © 2023 by the authors.DOI
10.3390/jcs7100444Тип публикаций
Практическое значение
The practical significance of this study lies in demonstrating that carbon dioxide activation is an effective and environmentally friendly method for producing high-performance activated carbon electrodes from agricultural waste such as rice husk and walnut shell. The results provide valuable guidance for developing sustainable supercapacitor materials with improved rate capability, lower charge transfer resistance, and enhanced ion transport, supporting the creation of cost-effective and eco-friendly energy storage devices for renewable energy systems and portable electronics.Квартиль
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SCImago (Scopus)Impact Factor
5Количество цитирований
39Данный документ располагается в коллекциях
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