六角形Co3O4薄片的制备表征与赝电容性能研究

Preparation and Characterization of Hexagonal Co3O4 Flakes and Study on Their Pseudocapacitive Performance

采用溶液法制备的前驱体经热分解得到了六角形Co3O4薄片。用SEM、TEM、XPS、XRD、FT-IR和氮气吸附-脱附分析等手段对样品进行表征,结果表明,该六角形薄片由大量的尖晶石型Co3O4微球组成,比表面积达58.6 m2·g-1。利用电化学方法研究了六角形Co3O4薄片在6.0 mol·L-1 KOH溶液中的赝电容行为,结果显示,在1 A·g-1的电流密度下六角形Co3O4薄片修饰的泡沫镍电极的比电容高达447.86 F·g-1。在6 A·g-1的电流密度为下经2000次循环测试后,其电容保持率高达95.46%。

Hexagonal Co3O4 flakes were obtained via pyrolyzing precursor prepared by solution method.The samples were characterized by SEM,TEM,XPS,XRD,FT-IR and nitrogen adsorption-desorption.The results showed that these hexagonal flakes consist of numerous spinel-type Co3O4 microspheres and have a large specific surface area of 58.6 m2·g-1.The capacitive performance of hexagonal Co3O4 flakes were investigated by using electro-chemical methods in 6.0 M KOH solution.The results revealed that the hexagonal Co3O4 flakes present a large specific capacitance of as high as 447.86 F·g-1 at discharge current density of 1 A·g-1,Furthermore,it exhibits an outstanding stability reflected by a high capacitive retention of 95.46%after a 2000-cycles test at current density of 6 A·g-1.