(CoFe)Se2@NC超级电容器电极材料的制备及其电化学性能

金属-有机框架(MOF)衍生的过渡金属硒化物和多孔碳纳米复合材料具有巨大的储能优势,是应用于电化学储能的优良电极材料。采用共沉淀法制备CoFe类普鲁士蓝(CoFe-PBA)纳米立方,并通过静电组装在CoFe-PBA上包覆聚吡咯(PPy)得到CoFe-PBA@PPy;通过在400℃氮气中退火并硒化成功制备了氮掺杂的碳(NC)包覆(CoFe)Se₂的(CoFe)Se₂@NC纳米复合材料,并对其结构和形貌进行了表征。以(CoFe)Se₂@NC为电极制备了超级电容器,测试了其电化学性能,结果表明,在电流密度1 A/g时超级电容器的比电容达到1047.9 F/g,在电流密度5 A/g下1000次循环后具有良好的循环稳定性和96.55%的比电容保持率。由于其性能优越、无毒、成本低和易于制备,未来(CoFe)Se₂@NC纳米复合材料在超级电容器中具有非常大的应用潜力。

Preparation of(CoFe)Se2@NC Electrode Material and Its Electrochemical Properties in Supercapacitors

Metal-organic framework(MOF)derived transition metal selenides and porous carbon nanocomposites have great energy storage advantages,and are the superb electrode materials for electrochemical energy storage applications.CoFe-prussian blue analogue(CoFe-PBA)nanocube was prepared by the coprecipitation method,and CoFe-PBA@PPy was obtained with polypyrrole(PPy)coated on CoFe-PBA by electrostatic assembly.(CoFe)Se₂@NC nanocomposites with nitrogen doped carbon(NC)coated on(CoFe)Se₂were successfully prepared by annealing and selenidation in nitrogen at 400℃.The structure and morphology of(CoFe)Se₂@NC nanocompo-sites were characterized.By using(CoFe)Se₂@NC as electrode,the supercapacitors were prepared,and their electrochemical properties were tested.The results show that the specific capacitance of the supercapacitor reaches 1047.9 F/g at 1 A/g current density,and the supercapacitors have good cycle stability and 96.55%specific capacitance retention rate after 1000 cycles at 5 A/g current density.Due to their superior performance,non-toxic,low cost and easy preparation,(CoFe)Se₂@NC nanocomposites have great application potential in supercapacitor in the future.