【摘要】 以硫酸锰（MnSO₄）和高锰酸钾（KMnO₄）为反应物,以碳纳米管（CNTs）为载体,通过液相合成法制备纳米MnO₂/CNTs复合材料,将其按一定比例与活性炭均匀复合制备AC/MnO₂/CNTs三元复合电极并组装成电容器。采用X射线衍射（XRD）和透射电镜（TEM）对复合材料成分、晶型、形貌进行表征,并通过恒流充放电、循环伏安和交流阻抗测试研究AC/MnO₂/CNTs复合电容器电化学性能。结果表明:复合电容器在1mol/L（NH₄）₂SO₄电解液中具有良好的充放电可逆性,其比电容随MnO₂含量增加呈现先增大后减小的趋势,当MnO₂/CNTs含量为30%时,电容值达到最高,为528F/g。更多还原

【Abstract】 MnO₂/CNTs composite material was synthesized via liquid method using MnSO₄ and KMnO₄ as reactants and CNTs as support,then mixed with activated carbon according to a certain proportion to produce AC/MnO₂/CNTs ternary electrodes and assembled into composite capacitor.Composition,crystal shape and morphology of the as-prepared samples were characterized by X-ray diffraction（XRD）and transmission electron microscopy（TEM）techniques.Its electrochemical performances were investigated in 1mol/L（NH₄）₂SO₄ electrolyte by galvanostatic charge/discharge cyclic voltammetry and alternate current impedance methods.Electrochemical experimental results demonstrate that AC/MnO₂/CNTs ternary capacitor had good performance.It was found that specific capacitance showed a trend of first increase and then decrease with the increasing of the MnO₂ content.The maximal specific capacitance occured when the MnO₂ content was 30%,reached 528F/g.The cyclic voltammetry test showed that the composite had a good electrochemical reversibility.更多还原