铈
兴奋剂
介电谱
循环伏安法
阴极
材料科学
电化学
杂原子
无机化学
扫描电子显微镜
分析化学(期刊)
化学
电极
物理化学
冶金
光电子学
有机化学
复合材料
色谱法
戒指(化学)
作者
Jianwei Wang,Xiaolei Sun,Hongyang Zhao,Lingling Xu,Jiale Xia,Meng Luo,Yaodong Yang,Yaping Du
标识
DOI:10.1021/acs.jpcc.9b05535
摘要
Doping with heteroatoms is being used as an effective way to change electronic structure of electrode materials for advanced storage systems. Herein, β-MnO2 and rare earth (cerium) doped MnO2 cathode materials have been successfully prepared for aqueous zinc ion batteries. Cerium doping induced structural transformation of MnO2 from β- to α-phase, along with the evident improvement of conductivity, stability, and reversibility. Compared to the undoped β-MnO2, the doping cathode possessed excellent cycling stability at a high rate of 5 C and higher rate capability. Cyclic voltammetry curves, electrochemical impedance spectroscopy, galvanostatic intermittent titration technique, scanning electron microscopy, and transmission electron microscopy measurements demonstrated that cerium doping caused fast Zn2+ diffusion and excellent electrochemical stability.
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