Aqueous Zn ion batteries(ZIBs)are promising in energy storage due to the low cost,high safety,and material abundance.The development of metal oxides as the cathode for ZIBs is limited by the strong electrostatic force...Aqueous Zn ion batteries(ZIBs)are promising in energy storage due to the low cost,high safety,and material abundance.The development of metal oxides as the cathode for ZIBs is limited by the strong electrostatic forces between O2−and Zn2+which leads to poor cyclic stability.Herein,Bi2S3 is proposed as a promising cathode material for rechargeable aqueous ZIBs.Improved cyclic stability and fast diffusion of Zn2+is observed.Also,the layered structure of Bi2S3 with the weak van der Waals interaction between layers offers paths for diffusion and occupancy of Zn2+.As a result,the Zn/Bi2S3 battery delivers high capacity of 161 mAh g−1 at 0.2 A g−1 and good cycling stability up to 100 cycles with ca.100%retention.The battery also demonstrates good cyclic performance of ca.80.3%over 2000 cycles at 1 A g−1.The storage mechanism in the Bi2S3 cathode is related to the reversible Zn ion intercalation/extraction reactions and the capacitive contribution.This work indicates that Bi2S3 shows great potential as the cathode of ZIBs with good performance and stability.展开更多
Bismuth sulfide(Bi_(2)S_(3))has attracted particular interest as a potential anode material for sodium-ion batteries(SIBs).However,the low electrical conductivity and dramatic volumetric change greatly restrict its pr...Bismuth sulfide(Bi_(2)S_(3))has attracted particular interest as a potential anode material for sodium-ion batteries(SIBs).However,the low electrical conductivity and dramatic volumetric change greatly restrict its practical applications.In view of the apparent structural and compositional advantages of metal-organic frameworks(MOFs)derived carbon-based composite,herein,as a proof of concept,Bi_(2)S_(3) spheres coated with the MOF-derived Co_(9)S_(8) and N-doped carbon composite layer(Bi_(2)S_(3)@Co_(9)S_(8)/NC composite spheres)have been rational designed and synthesized.As expected,the core-shell Bi_(2)S_(3)@Co_(9)S_(8)/NC composite spheres exhibit remarkable electrochemical performance in terms of high reversible capacity(597 m Ah g^(-1) after 100 cycles at 0.1 A g^(-1)),good rate capability(341 m Ah g^(-1) at 8 A g^(-1))and long-term cycling stability(458 m Ah g^(-1) after 1000 cycles at 1 A g^(-1))when investigated as anode materials for SIBs.Electrochemical analyses further reveal the favorable reaction kinetics in the Bi_(2)S_(3)@Co_(9)S_(8)/NC composite spheres.In addition,the possible sodium storage mechanism has been studied by ex-situ X-ray diffraction technique.More importantly,a sodium-ion full cell based on Na_(3) V_(2)(PO_(4))_(3)/r GO as cathode and Bi_(2)S_(3)@Co_(9)S_(8)/NC as anode is also fabricated,suggesting their potential for practical applications.It is anticipated that the present work could be extended to construct other advanced electrode materials using MOFs-derived carbon-based composites as surface coating materials for various energy storagerelated applications.展开更多
文摘Aqueous Zn ion batteries(ZIBs)are promising in energy storage due to the low cost,high safety,and material abundance.The development of metal oxides as the cathode for ZIBs is limited by the strong electrostatic forces between O2−and Zn2+which leads to poor cyclic stability.Herein,Bi2S3 is proposed as a promising cathode material for rechargeable aqueous ZIBs.Improved cyclic stability and fast diffusion of Zn2+is observed.Also,the layered structure of Bi2S3 with the weak van der Waals interaction between layers offers paths for diffusion and occupancy of Zn2+.As a result,the Zn/Bi2S3 battery delivers high capacity of 161 mAh g−1 at 0.2 A g−1 and good cycling stability up to 100 cycles with ca.100%retention.The battery also demonstrates good cyclic performance of ca.80.3%over 2000 cycles at 1 A g−1.The storage mechanism in the Bi2S3 cathode is related to the reversible Zn ion intercalation/extraction reactions and the capacitive contribution.This work indicates that Bi2S3 shows great potential as the cathode of ZIBs with good performance and stability.
基金the financial support from the Central Government Research Programs to Guide the Local Scientific and Technological Development(Grant no.2018L3001)the National Natural Science Foundation of China(Grant nos.51872048 and U1732155)the Natural Science Foundation of Fujian Province,China(Grant no.2018J01677)。
文摘Bismuth sulfide(Bi_(2)S_(3))has attracted particular interest as a potential anode material for sodium-ion batteries(SIBs).However,the low electrical conductivity and dramatic volumetric change greatly restrict its practical applications.In view of the apparent structural and compositional advantages of metal-organic frameworks(MOFs)derived carbon-based composite,herein,as a proof of concept,Bi_(2)S_(3) spheres coated with the MOF-derived Co_(9)S_(8) and N-doped carbon composite layer(Bi_(2)S_(3)@Co_(9)S_(8)/NC composite spheres)have been rational designed and synthesized.As expected,the core-shell Bi_(2)S_(3)@Co_(9)S_(8)/NC composite spheres exhibit remarkable electrochemical performance in terms of high reversible capacity(597 m Ah g^(-1) after 100 cycles at 0.1 A g^(-1)),good rate capability(341 m Ah g^(-1) at 8 A g^(-1))and long-term cycling stability(458 m Ah g^(-1) after 1000 cycles at 1 A g^(-1))when investigated as anode materials for SIBs.Electrochemical analyses further reveal the favorable reaction kinetics in the Bi_(2)S_(3)@Co_(9)S_(8)/NC composite spheres.In addition,the possible sodium storage mechanism has been studied by ex-situ X-ray diffraction technique.More importantly,a sodium-ion full cell based on Na_(3) V_(2)(PO_(4))_(3)/r GO as cathode and Bi_(2)S_(3)@Co_(9)S_(8)/NC as anode is also fabricated,suggesting their potential for practical applications.It is anticipated that the present work could be extended to construct other advanced electrode materials using MOFs-derived carbon-based composites as surface coating materials for various energy storagerelated applications.
