PVP辅助Co3O4纳米雪花合成及在超级电容器中的应用

PVP-directed Synthesis of Co3O4 Nanosnowfl ake and Its Application in Supercapacitor

本文以氯化钴为原料,聚乙烯吡咯烷酮(PVP)作为形貌控制剂,采用水热法与后续高温煅烧相结合,制备了雪花状四氧化三钴多孔纳米片(Co3O4PMS)。利用XRD和SEM方法对Co3O4PMS的物相和表面形貌进行了鉴定和表征。结果表明,Co3O4PMS具有比较均匀的多孔雪花片状结构,这为增大与溶液的接触面积提供了便利。该材料在电流密度为1?A·g-1时,比电容达到566.87?F·g-1,并在2?A·g-1电流密度下进行了循环稳定性测试,经过2000次循环充放电后,比电容为285?F·g-1,电容保留率为66.31%,预期将在超级电容器领域具有一定的潜在价值。

In this paper,sponge like cobalt oxide porous nanosheets(Co3O4 PMS)were prepared by using Cobalt(Ⅱ)chloride as raw material,polyvinylpyrrolidone(PVP)as the morphology control agent through hydrothermal method and subsequent high-temperature calcination.The phase and surface morphology of the synthesized Co3O4 PMS were identified and characterized using XRD and SEM methods.The Co3O4 PMS displayed a relatively uniform hollow snowflake sheet structure,which provides convenience for increasing the contact area with the solution.At a current density of 1 A·g-1,the specific capacitance of this material reached 566.87 F·g-1.Cyclic stability test was then conducted at a current density of 2 A·g-1.After 2000 cycles of charging and discharging,the specific capacitance of the electrode material was 285 F·g-1,with a retention rate of 66.31%.It is expected to have certain potential value in supercapacitor.