We report a hybrid structure of graphene/porous nitrogen-doped carbon nanofibers(G-PCNFs)with pronounced potassium-storage performances in terms of specific capacity,long-term cycling stability,and rate capability.In ...We report a hybrid structure of graphene/porous nitrogen-doped carbon nanofibers(G-PCNFs)with pronounced potassium-storage performances in terms of specific capacity,long-term cycling stability,and rate capability.In this structure,graphene(G)favors the transfer of electrons to enhance the conductivity,ensuring good rate capability for PIBs.Moreover,the porous structure has ample exposed N-doped active sites to adsorb K^(+)to improve the capacitive contribution beyond the intercalation mechanism.As a result,the resulting G-PCNFs exhibit a highly reversible capacity of 358 mA h g^(-1)at 0.1 A g^(-1)after 200 cycles,outstanding rate performance(101 mA h g^(-1)at 5 A g^(-1))and ultralong cycling stability(276 mA h g^(-1)at 2 A g^(-1)after 2000 cycles).This work provides a new strategy for constructing carbonaceous anodes to achieve superior potassium-storage performances.展开更多
基金supported by the National Natural Science Foundation of China(21601003 and 21972145)。
文摘We report a hybrid structure of graphene/porous nitrogen-doped carbon nanofibers(G-PCNFs)with pronounced potassium-storage performances in terms of specific capacity,long-term cycling stability,and rate capability.In this structure,graphene(G)favors the transfer of electrons to enhance the conductivity,ensuring good rate capability for PIBs.Moreover,the porous structure has ample exposed N-doped active sites to adsorb K^(+)to improve the capacitive contribution beyond the intercalation mechanism.As a result,the resulting G-PCNFs exhibit a highly reversible capacity of 358 mA h g^(-1)at 0.1 A g^(-1)after 200 cycles,outstanding rate performance(101 mA h g^(-1)at 5 A g^(-1))and ultralong cycling stability(276 mA h g^(-1)at 2 A g^(-1)after 2000 cycles).This work provides a new strategy for constructing carbonaceous anodes to achieve superior potassium-storage performances.
