Park Han Yul, Huang Minhu, Yoon Tae-Ho, Song Kyung Hun
Department of Clothing and Textiles, Pai Chai University 155-40 Baejae-ro (Doma-Dong), Seo-gu Daejeon 35345 South Korea
School of Materials Science and Engineering, Gwangju Institute of Sci. and Tech. (GIST) 123 Cheomdangwagi-ro, Buk-gu Gwangju 61005 South Korea
RSC Adv. 2021 Nov 30;11(61):38515-38522. doi: 10.1039/d1ra07815a. eCollection 2021 Nov 29.
Activated carbon monoliths of kenaf (ACMKs) were prepared by moulding kenaf fibers into a column-shape monolith and then carrying out pyrolysis at 500, 600, 700 or 800 °C, followed by activation with KOH at 700 °C. Then, the sample was characterized using thermogravimetric analyzer (TGA), field-emission scanning electron microscopy (FE-SEM), field-emission transmission electron microscopy (FE-TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, X-ray diffraction (XRD) and N sorption instruments. The prepared ACMK was subjected to electrochemical property evaluation cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The GCD study using a three-electrode system showed that the specific capacitance decreased with higher pyrolysis temperature (PYT) with the ACMK pyrolyzed at 500 °C (ACMK-500) exhibiting the highest specific capacitance of 217 F g. A two-electrode system provided 95.9% retention upon a 5000 cycle test as well as the specific capacitance of 212 F g, being converted to an energy density of 6 W h kg at a power density of 215 W kg.
通过将红麻纤维模塑成柱状整体材料，然后在500、600、700或800℃下进行热解，接着在700℃下用氢氧化钾活化，制备了红麻活性炭整体材料（ACMKs）。然后，使用热重分析仪（TGA）、场发射扫描电子显微镜（FE-SEM）、场发射透射电子显微镜（FE-TEM）、X射线光电子能谱（XPS）、拉曼光谱、X射线衍射（XRD）和氮吸附仪器对样品进行表征。将制备的ACMK进行电化学性能评估，包括循环伏安法（CV）、恒电流充放电（GCD）和电化学阻抗谱（EIS）。使用三电极系统的GCD研究表明，随着热解温度（PYT）升高，比电容降低，在500℃下热解的ACMK（ACMK-500）表现出最高比电容217 F/g。两电极系统在5000次循环测试后保留率为95.9%，比电容为212 F/g，在功率密度为215 W/kg时转换为能量密度6 W h/kg。
