Ce掺杂Mn3O4及其电化学电容行为

用溶胶-凝胶方法合成了Mn₃O₄和Ce掺杂Mn₃O₄. 采用X射线衍射(XRD)、傅里叶变换红外(FT-IR)光谱、场发射扫描电镜(FESEM)和透射电子显微镜(TEM)对其结构和形貌进行了表征. 采用循环伏安、电化学交流阻抗和恒流充放电技术对其电化学性能进行了测试. 研究结果表明, Ce掺杂对Mn₃O₄的形貌和电化学性能均有显著影响. 当Ce离子占金属离子总量的3%时, 掺杂Mn₃O₄的单电极比电容高达477 F·g^-1, 比未掺杂的提高了43.7%, 并且表现出更好的循环稳定性.

Ce-Doped Mn3O4 and Its Electrochemical Capacitive Behavior

Mn₃O₄ and Ce doped Mn₃O₄ were synthesized via a sol-gel route using metal nitrates as raw materials and citric acid as the chelating agent.The gel precursors were calcined at 300℃for 12 h in a muffle furnace.Their morphology and structure were characterized using powder X-ray diffraction（XRD）, Fourier transform infrared（FT-IR） spectroscopy,field emission scanning electron microscopy（FESEM）, and transmission electron microscopy（TEM）.Their electrochemical performance as a supercapacitor electrode material was investigated comparatively by cyclic voltammetry（CV）,electrochemical impedance spectroscopy（EIS）,and galvanostatic charge-discharge.The experimental results indicated that Ce-doping did not change the structure of Mn₃O₄ but greatly affected the morphology and considerably enhanced the electrochemical performance of Mn₃O₄.A specific capacitance of 477 F·g^-1 was obtained when the mole ratio of Ce ion to total metal ions was 3%,which was 43.7%higher than that of the undoped material.Moreover,Ce-doping significantly improved the capacitance retention ability.