掺CeO_2纳米MnO_2非对称超级电容器的研究

Study on CeO_2 Doped Nano-MnO_2 Asymmetric Supercapacitor

采用化学共沉淀法制备出超级电容器用掺CeO2的MnO2电极材料,通过XRD、SEM对样品进行了表征,研究了掺杂量对MnO2电极稳定性能的影响。结果表明,产物主相为α-MnO2,粒度分布较均匀,在50～100nm;在6mol/L的KOH电解液中,该掺杂MnO2电极材料具有优良的电容行为和循环稳定性能。当掺CeO2量为10%(与MnO2的质量比)时,在电流密度为250mA/g时,比电容量达257.68F/g;循环500次,容量仅衰减1.18%。

CeO2 doped MnO2 used as electrode materials for supercapacitor were prepared by chemical co-precipitation, The material was characterized by using XRD, SEM. The effect of the mass ratio of CeO2 and MnO2 on the stability was studied. The results show that the material has crystal structure with particle diameter range from 50 to 100 nm. The CeO2 doped nano-MnO2 exhibits excellent capacitance and stability in 6 mol/L KOH electrolyte when the working voltage is 0.9 V. When the mass ratio of CeO2 and MnO2 is 10 %, a maximum specific capacitance of 257.68 Fig is obtained under 250 mA/g current density and the capacity only loses 1.18 % after 500 cycles.