期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 246, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2020.122830
关键词
Alfalfa flowers; Porous carbons; Acidic washing; KOH activation; Supercapacitor
资金
- National Natural Science Foundation of China [51262027]
- Fundamental Scientific Research Funds for the Central Universities [31920130063]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201754]
Alfalfa flowers derived oxygen-rich porous carbons are fabricated via carbonization, acidic washing and KOH activation processes. Supercapacitor electrodes designed from these porous carbons are characterized in both three- and two-electrode measurement systems with 6 M KOH as electrolyte at room temperature by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The experimental results show that the acidic washing for carbonized carbons and activation temperature perform profound effects on the capacitance performance of the porous carbons. Acidic washing treatment removes most of residues, which do not contribute capacitance for porous carbons. High temperature activation leads to large specific surface area and thus increases the capacitance of porous carbons. In three-electrode system, the electrode designed from carbons activated at 800 degrees C after acidic washing shows the highest specific capacitance of 350.1 F g(-1) at current density of 0.5 A g(-1) and 297 F g(-1) is kept at current density of 50 A g(-1). The specific capacitance of the symmetrical supercapacitor is 201.4 F g(-1) at 0.1 A g(-1) with 82.7% capacitance retention (166.6 F g(-1)) at 10 A g(-1). The energy density of the symmetrical supercapacitor increases from 23.2 Wh kg(-1) to 28 Wh kg(-1) with decreasing power density from 10.3 kW kg(-1) to 100 W kg(-1).
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