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选用过硫酸钾(K_2S_2O_8)和一水合硫酸锰(MnSO_4·H_2O)为原材料,通过液相共沉淀法制得MnO_2,用X射线衍射和扫描电镜对制得的MnO_2进行结构形貌表征。结果表明,在控制溶液p H值为l,反应温度为60℃,反应时间为22 h的条件下,制得的四方晶系α-MnO_2微球的表面具有明显的纳米刺结构特征。将所制得的四方晶系α-MnO_2用于超级电容器的电极材料,以6 mol/L的KOH作为电解质溶液,研究其恒电流充放电、循环伏安及交流阻抗等电化学性能,当扫描速度为5 m V/s时,其比容量为156.0 F/g。
MnO2 was prepared by liquid coprecipitation using potassium persulfate (K 2 S 2 O 8) and manganese sulfate monohydrate (MnSO 4 · H 2 O) as raw materials. The morphology of MnO 2 was characterized by X-ray diffraction and scanning electron microscopy. The results show that the surface of the tetragonal α-MnO 2 microspheres has obvious nano-thorium structure under the conditions of pH = 1, reaction temperature 60 ℃ and reaction time 22 h. The prepared tetragonal α-MnO 2 was used as the electrode material of the supercapacitor and the electrochemical performance of constant current charge and discharge, cyclic voltammetry and AC impedance was studied by using 6 mol / L KOH as electrolyte solution. When scanning The specific capacity was 156.0 F / g at 5 mV / s.