CAJ | 학술논문

添加不同系列的聚乙二醇(PEG)分散剂,采用化学混合法制备了MnO_2/AC(活性炭)复合材料.应用X射线衍射、恒流充放电、交流阻抗和循环伏安等方法研究了各分散剂对产物结构与电化学性能的影响.实验结果表明,分散剂聚乙二醇(PEG)的聚合度对MnO_2/AC复合材料的比电容和循环寿命有显著的影响,其中PEG400作为分散剂制备的复合材料具有最好的电化学电容行为.以PEG400制得的复合材料为正极,活性炭为负极组成超级电容器,在电流密度为100 mA/g条件下,MnO_2/AC复合材料的比电容达366 F/g,且经500次充放电循环后容量仍保持在94%以上,显示出该复合材料具有良好的超电容特性.
첨가불동계렬적취을이순(PEG)분산제,채용화학혼합법제비료MnO_2/AC(활성탄)복합재료.응용X사선연사、항류충방전、교류조항화순배복안등방법연구료각분산제대산물결구여전화학성능적영향.실험결과표명,분산제취을이순(PEG)적취합도대MnO_2/AC복합재료적비전용화순배수명유현저적영향,기중PEG400작위분산제제비적복합재료구유최호적전화학전용행위.이PEG400제득적복합재료위정겁,활성탄위부겁조성초급전용기,재전류밀도위100 mA/g조건하,MnO_2/AC복합재료적비전용체366 F/g,차경500차충방전순배후용량잉보지재94%이상,현시출해복합재료구유량호적초전용특성.
The amorphous manganese dioxide/activated carbon composites were synthesized with the addition of different series of PEG dispersants by a chem-mixed method. The influence of different dispersants on the performance of MnO_2/AC was studied using X-ray diffraction, constant current charge-discharge, alternate current impendence and cyclic voltammetry. The experimental results show that the polymerization degree of the PEG dispersants has an obvious effect on the electrochemical capacitance performance of MnO_2/AC materials. The electrochemical hybrid supercapacitor was assembled with the PEG400 composite material as the positive electrode and activated carbon as the negative electrode, with a maximum specific capacitance of the composites being 366 F/g in 100 mA/g current density. The capacitance of the capacitor was still kept more than 94% after 500 charge-discharge cycles in 6 mol/L KOH aqueous solutions. The composite materials exhibit good supercapacitance behaviors, such as high reversible characteristics and excellent cycle stability.