Rational design of electrode meterials with unique core-shell nanostructures is of great significance for improving the electrochemical performance of supercapacitors. In this work, we prepare several CuCo_(2)O_(4)@Ni...Rational design of electrode meterials with unique core-shell nanostructures is of great significance for improving the electrochemical performance of supercapacitors. In this work, we prepare several CuCo_(2)O_(4)@Ni-Co-S composite electrodes by a controllable hydrothermal and electrodeposition route. Onedimensional nanowires can shorten the ions transport path, while two-dimensional nanosheets expose many active sites. This enables three-dimensional structured composite with high electrochemical activity. The as-prepared heterostructured materials show a specific of 1048 C/g at 1 A/g. It still maintains 75.6% of initial capacity after 20000 cycles at 10 A/g. The device delivers an energy density of 79.2 Wh/kg when the power density reaches to 2280 W/kg. Moreover, it possesses an excellent mechanical stability after repeated folding at different angles.展开更多
Supercapacitors as one of the most promising energy storage systems have been extensively studied due to the unique merits such as long-term cycling stability,fast charge rate,and low maintenance cost.It is widely kno...Supercapacitors as one of the most promising energy storage systems have been extensively studied due to the unique merits such as long-term cycling stability,fast charge rate,and low maintenance cost.It is widely known that the electrochemical performances of supercapacitors are closely related to the structure and specific surface area of the electrode materials.Therefore,many researches are focused on the design and synthesis of the electrode materials with novel shapes and large surface area.CuCo_(2)O_(4)has recently attracted enormous research interests as the electrode materials for supercapacitors owing to its inherent advantages including high theoretical capacity,environmental friendliness,natural abundance,and low cost.In the practical applications the CuCo_(2)O_(4)still suffers from some drawbacks,for instance,poor conductivity,relatively low specific capacity,and poor cycling durability.Hence,a comprehensive summary about the recent progress of CuCo_(2)O_(4)-based materials is necessary and significant to better understand the opportunity and challenge that such material faces.In this work,the progress of preparation methods and electrochemical performances of CuCo_(2)O_(4)-based materials is comprehensively reviewed.The aim of this review is to highlight some of the advances made by CuCo_(2)O_(4)-based electrode materials for supercapacitors and guide future research toward closing the gap between achieved and theoretical capacity,without limiting the loading mass.展开更多
Hollow nanostructures of transition metal oxides(TMOs)with hollow interior,low density,large surface area and surface permeability have drawn significant interest as electrode materials for supercapacitors.However,it ...Hollow nanostructures of transition metal oxides(TMOs)with hollow interior,low density,large surface area and surface permeability have drawn significant interest as electrode materials for supercapacitors.However,it is still challenging to controllably prepare hollow nanostructures by a facile method.Herein,we report for the first time that CuCo_(2)O_(4 )microrod precursor obtained from a solvothermal method in ethanol media can be converted into porous CuCo_(2)O_(4 )microtubes(CuCo_(2)O_(4 )MTs)in the post annealing treatment.The results of electrochemical tests demonstrate that these MTs are categorized as the typical battery-grade electrode materials.They can deliver a high capacity up to 393.66 C g^(-1) at ^(-1) A g^(-1) and still hold 305.99 C g^(-1) at 10 A g^(-1).Additionally,an assembled hybrid supercapacitor(CuCo_(2)O_(4 )MTs//AC HSC)exhibits 78.23 F g^(-1),good cycling durability and high energy density(32.49 W h kg^(-1) at 912.10 W kg^(-1)).The present synthetic methodology may be further applicable to the preparation of other hollow structural TMOs with applications in high-performance energy storage and conversion devices.展开更多
基金supported by National Natural Science Foundation of China(No.52172218)Key Laboratory of Engineering Dielectrics and Its Application(Harbin University of Science and Technology),Ministry of Education(No.KFZ202002)。
文摘Rational design of electrode meterials with unique core-shell nanostructures is of great significance for improving the electrochemical performance of supercapacitors. In this work, we prepare several CuCo_(2)O_(4)@Ni-Co-S composite electrodes by a controllable hydrothermal and electrodeposition route. Onedimensional nanowires can shorten the ions transport path, while two-dimensional nanosheets expose many active sites. This enables three-dimensional structured composite with high electrochemical activity. The as-prepared heterostructured materials show a specific of 1048 C/g at 1 A/g. It still maintains 75.6% of initial capacity after 20000 cycles at 10 A/g. The device delivers an energy density of 79.2 Wh/kg when the power density reaches to 2280 W/kg. Moreover, it possesses an excellent mechanical stability after repeated folding at different angles.
文摘Supercapacitors as one of the most promising energy storage systems have been extensively studied due to the unique merits such as long-term cycling stability,fast charge rate,and low maintenance cost.It is widely known that the electrochemical performances of supercapacitors are closely related to the structure and specific surface area of the electrode materials.Therefore,many researches are focused on the design and synthesis of the electrode materials with novel shapes and large surface area.CuCo_(2)O_(4)has recently attracted enormous research interests as the electrode materials for supercapacitors owing to its inherent advantages including high theoretical capacity,environmental friendliness,natural abundance,and low cost.In the practical applications the CuCo_(2)O_(4)still suffers from some drawbacks,for instance,poor conductivity,relatively low specific capacity,and poor cycling durability.Hence,a comprehensive summary about the recent progress of CuCo_(2)O_(4)-based materials is necessary and significant to better understand the opportunity and challenge that such material faces.In this work,the progress of preparation methods and electrochemical performances of CuCo_(2)O_(4)-based materials is comprehensively reviewed.The aim of this review is to highlight some of the advances made by CuCo_(2)O_(4)-based electrode materials for supercapacitors and guide future research toward closing the gap between achieved and theoretical capacity,without limiting the loading mass.
基金This research was financially supported by the Natural Science Foundation of Shanxi Province(201801D221371).
文摘Hollow nanostructures of transition metal oxides(TMOs)with hollow interior,low density,large surface area and surface permeability have drawn significant interest as electrode materials for supercapacitors.However,it is still challenging to controllably prepare hollow nanostructures by a facile method.Herein,we report for the first time that CuCo_(2)O_(4 )microrod precursor obtained from a solvothermal method in ethanol media can be converted into porous CuCo_(2)O_(4 )microtubes(CuCo_(2)O_(4 )MTs)in the post annealing treatment.The results of electrochemical tests demonstrate that these MTs are categorized as the typical battery-grade electrode materials.They can deliver a high capacity up to 393.66 C g^(-1) at ^(-1) A g^(-1) and still hold 305.99 C g^(-1) at 10 A g^(-1).Additionally,an assembled hybrid supercapacitor(CuCo_(2)O_(4 )MTs//AC HSC)exhibits 78.23 F g^(-1),good cycling durability and high energy density(32.49 W h kg^(-1) at 912.10 W kg^(-1)).The present synthetic methodology may be further applicable to the preparation of other hollow structural TMOs with applications in high-performance energy storage and conversion devices.
