期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 15, 页码 -出版社
MDPI
DOI: 10.3390/ijms23158537
关键词
supercapacitor; electric double-layer capacitor (EDLC); activated carbon (AC); power density
资金
- Technology Innovation Program - Ministry of Trade, Industry and Energy (MOTIE, Korea) [20016795]
- Nano.Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2019M3A7B9071501]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20016795] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019M3A7B9071501] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, a kenaf-derived activated carbon was developed for high-power density supercapacitors through phosphoric acid activation. The activated carbon exhibited a mesoporous structure and had a larger specific surface area and total pore volume compared to commercial activated carbon. Moreover, the reduction rate of specific capacitance at high charge-discharge rates was lower for the kenaf-derived activated carbon.
A kenaf-derived activated carbon (KAC) for a high-power density supercapacitor was developed in this study through phosphoric acid activation. The N-2/77K isothermal adsorption-desorption curve was used to estimate the textural properties of KAC based on BET and BJH and the pore size distribution based on NLDFT. The electrochemical properties of KAC were analyzed by using the coin-type cell applying 1 M SPBBF4/PC electrolyte, and the specific surface area and total pore volume were 1490-1942 m(2)/g and 1.18-3.18 cm(3)/g, respectively. The pore characteristics of KAC varied according to the activation temperature, and most KAC showed a mesoporous structure. As the activation temperature increased, the mesopore volume increased up to 700 degrees C, then decreased. The mesoporous structure of KAC resulted in a substantial decrease in the Warburg impedance as the ion diffusion resistance decreased. Hence, the specific capacitance of KAC decreased from 82.9 F/g to 59.48 F/g as the charge-discharge rate increased from 1 mA/g to 10 mA/g, with the rate of reduction at approximately 30%. The rate of reduction of KAC's specific capacitance was 50% lower compared with commercial activated carbon; hence, KAC is a more suitable electrode-active material for high power density supercapacitors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据