Mn4+掺杂Co3O4纳米纤维的静电纺丝法制备及其电化学性能

摘要

Mn4+ doped Co3O4 nanofibers with nCo∶nMn=20∶2 have large surface with 68 m2·g-1.Under the current density of 1 A·g-1,the 20∶2 sample has a maximum capacitance of 585 F·g-1,which is obviously higher than that of pure cobalt oxide nanofiber ～416 F·g-1.After 500 cycles of charging and discharging,the specific capacitance of 20∶2 sample is maintained about 82.6％,but that of the pure cobalt oxide nanofiber is only 76.4％.The mechanism of performance improvement of the composite fibers was analyzed concretely.%通过静电纺丝法制备Mn4+掺杂的Co3O4复合纳米纤维,利用XRD、XPS、BET、SEM和电化学工作站等对材料的结构、成分、形貌和电化学性能进行表征与测试.研究发现,通过Mn4+掺杂,Co3O4复合纳米纤维的电化学性能得到明显改善.当nCo∶nM20:2时,相应的复合纤维具有较大比表面积68 m2· g-1,而且该样品呈现出清晰的氧化还原峰,在1 A·g-1的电流密度下,放电比电容量为585 F·g-1,这比纯Co3O4纳米纤维的416 F·g-1,有显著提高;循环500圈电容保持率达到82.6％,而纯Co3O4纳米纤维则是76.4％.