One-dimensional(1D)hollow-structured nanomaterials with desirable compositions have aroused huge attention in the field of electrochemical energy storage.In the present study,1D hierarchical cobalt hexacyanoferrate(Co...One-dimensional(1D)hollow-structured nanomaterials with desirable compositions have aroused huge attention in the field of electrochemical energy storage.In the present study,1D hierarchical cobalt hexacyanoferrate(CoHCF)microtubes were initially fabricated using a facile self-templated method with the electrospun polyacrylonitrile(PAN)-cobalt acetate(Co(Ac)2)as templates.After the chemical reaction was performed between the templates and a potassium ferricyanide solution,the core-shell PANCo(Ac)2@CoHCF nanofibers were successfully fabricated.Subsequently,the CoHCF microtubes were finally obtained via the selective dissolution of the PAN-Co(Ac)2 cores.Benefiting from the unique structural characteristic,the CoHCF microtubes electrode exhibited prominent electrochemical characteristics in Na2SO4 aqueous electrolyte,including a high specific capacitance of 281.8 F g^-1(at 1 A g^-1),and good rate capability as well as long cycling stability(93%capacitance retention after 5000 cycles).The hybrid supercapacitor assembled with CoHCF microtubes and activated carbon(AC)as the positive and negative electrodes,respectively,exhibited a high energy density of 43.89 W h kg^-1,a power density of 27.78 k W kg^-1,as well as a long cycle life.Note that this versatile self-templated synthetic strategy could be extended to fabricate other 1D hollow Prussian blue(PB)or its analogues(PBA)with controllable composition,which have a potential application in a range of fields.展开更多
基金supported by the National Natural Science Foundation of China(51821091 and 51872233)the Natural Science Foundation of Shaanxi Province(2018JM5044)。
文摘One-dimensional(1D)hollow-structured nanomaterials with desirable compositions have aroused huge attention in the field of electrochemical energy storage.In the present study,1D hierarchical cobalt hexacyanoferrate(CoHCF)microtubes were initially fabricated using a facile self-templated method with the electrospun polyacrylonitrile(PAN)-cobalt acetate(Co(Ac)2)as templates.After the chemical reaction was performed between the templates and a potassium ferricyanide solution,the core-shell PANCo(Ac)2@CoHCF nanofibers were successfully fabricated.Subsequently,the CoHCF microtubes were finally obtained via the selective dissolution of the PAN-Co(Ac)2 cores.Benefiting from the unique structural characteristic,the CoHCF microtubes electrode exhibited prominent electrochemical characteristics in Na2SO4 aqueous electrolyte,including a high specific capacitance of 281.8 F g^-1(at 1 A g^-1),and good rate capability as well as long cycling stability(93%capacitance retention after 5000 cycles).The hybrid supercapacitor assembled with CoHCF microtubes and activated carbon(AC)as the positive and negative electrodes,respectively,exhibited a high energy density of 43.89 W h kg^-1,a power density of 27.78 k W kg^-1,as well as a long cycle life.Note that this versatile self-templated synthetic strategy could be extended to fabricate other 1D hollow Prussian blue(PB)or its analogues(PBA)with controllable composition,which have a potential application in a range of fields.
