MgCo2O4超级电容器电极材料的制备及其电化学性能研究

Preparation of MgCo2O4 Electrode Material for Supercapacitor and Its Electrochemical Properties

尖晶石类型的纳米材料的电容性能主要取决于其颗粒尺寸、比表面积、微观形貌及其结构等。为了获得较好的超级电容器的电极材料,采用尿素水热法和低温煅烧处理工艺成功地制备出了由纳米片组合而成的三维MgCo2O4片层花状结构,该结构尺寸存在差异,较小的尺寸约为7.34μm,较大的约为15.38μm,其中纳米片的厚度较均匀,约为63.9 nm。利用X射线衍射、扫描电镜、电化学工作站对产物进行了表征和电化学性能测试。结果表明,在电流密度为1 A/g情况下,比电容可达315.6 F/g。另外,对该片层花状结构的MgCo2O4材料循环4000圈后,仅损失26.5%,表现出良好的循环稳定性。

The capacitive performance of spinel-type nanomaterials mainly depends on their particle size,specific surface area,microscopic morphology and structure.In order to obtain better electrode materials for supercapacitors,we prepared 3D MgCo2O4 with lamellar flower-like structures composed of nanosheets,using the urea-based hydrothermal method at a lower temperature(120℃)。The size of the nanosheet varied with a smaller size of approximately 7.34μm and a larger size of approximately 15.38μm.The thickness of the nanosheets was uniform,approximately 63.9 nm.The sample was characterized by X-ray diffraction,scanning electron microscopy and electrochemical workstation.The result indicated that the specific capacity could reach 315.6 F/g at the current density of 1 A/g.Additionally,after 4000 cycles of MgCo2O4 material with lamellar flower-like structure,the loss was only 26.5%,showing good cycling stability.