Aqueous hybrid supercapacitors are promising due to their low cost and high safety. Herein, a freestanding battery-type electrode of Bi2O3 nanoflake@C on carbon cloth is designed for aqueous sodium ion hybrid supercap...Aqueous hybrid supercapacitors are promising due to their low cost and high safety. Herein, a freestanding battery-type electrode of Bi2O3 nanoflake@C on carbon cloth is designed for aqueous sodium ion hybrid supercapacitors. Due to the integration of nanoarray architecture and the conductive carbon,the Bi2O3@C electrode exhibits a high specific capacity of 207 mAh/g at 2 A/g（6C）, good rate capability and cycling stability（133 m Ah/g after 1000 cycles）. With the activated carbon as the capacitive electrode and neutral sodium salts as the electrolyte, a 1.9 V hybrid supercapacitor is assembled,delivering a high energy density of 18.94 Wh/kg. The device can still maintain 72.3% of initial capacity after 650 cycles. The present work holds great promise for developing next-generation hybrid supercapacitors.展开更多
采用乙炔等离子体浸没离子注入与沉积技术(P III-D)在医用涤纶缝合环材料表面沉积了一层类金刚石(DLC)薄膜。细菌黏附实验的结果证明沉积了类金刚石薄膜后的表面对五种细菌——金黄色葡萄球菌(S taphy lococcus aureus,SA)、表皮葡萄球...采用乙炔等离子体浸没离子注入与沉积技术(P III-D)在医用涤纶缝合环材料表面沉积了一层类金刚石(DLC)薄膜。细菌黏附实验的结果证明沉积了类金刚石薄膜后的表面对五种细菌——金黄色葡萄球菌(S taphy lococcus aureus,SA)、表皮葡萄球菌(S taphy lococcus ep iderm id is,SE)、大肠杆菌(E scherich ia co li,EC)、绿浓杆菌(P seudom onas aerug inosa,PA)和白色念珠菌(C and ida a lb icans,CA)的黏附均有明显的减少(P<0.05)。计算细菌与材料之间的黏附自由能ΔFadh表明:细菌对PET表面的黏附自由能为负值,而细菌对DLC表面的ΔFadh>0,因此细菌对DLC表面黏附过程难于发生,即使黏附也是可逆的。展开更多
The binder-free composite films of reduced graphene oxide （rGO） and activated carbon derived from cotton （aCFC） have been fabricated and used as electrodes for electrochemical capacitors （ECs） to avoid the decre...The binder-free composite films of reduced graphene oxide （rGO） and activated carbon derived from cotton （aCFC） have been fabricated and used as electrodes for electrochemical capacitors （ECs） to avoid the decrease of capacitive performance in traditional process caused by the additional binder. The optimal aCFC is prepared at 850 ℃ when the mass ratio of carbon and potassium hydroxide is 1 to 4. The optimal composite film prepared from the mass ratio of aCFC/GO = 2/1 exhibits porous structure, and has a specific surface area of 849.6 m^2·g^-1 and a total pore volume of 0.61 mL·g^-1. Based on the two-electrode system testing in 6.0 mol/L KOH electrolyte, the optimal composite has specific capacitance of about 202 Fog-1, 374 mF·cm^-2 and 116 F·cm^-3 in terms of mass, area and volume, and shows excellent rate capability and good cyclic stability （91.7% retention of the initial capacitance after 5000 cycles）. Furthermore, the assembled solid-state ECs by using KOH/polyvinyl alcohol as electrolyte show good mechanical stability and capacitive performances after repeated bending cycles. It is proved that this method is effective to fabricate binder-free electrodes for ECs and will open up a novel route for the reuse of waste cotton.展开更多
基金supported by grants from the National Natural Science Foundation of China(Nos.51672205 and 21673169)the National Key R&D Program of China(No.2016YFA0202602)+1 种基金the Research Start-Up Fund from Wuhan University of Technologythe Fundamental Research Funds for the Central Universities(Nos.2016IVA083,2017IB005)
文摘Aqueous hybrid supercapacitors are promising due to their low cost and high safety. Herein, a freestanding battery-type electrode of Bi2O3 nanoflake@C on carbon cloth is designed for aqueous sodium ion hybrid supercapacitors. Due to the integration of nanoarray architecture and the conductive carbon,the Bi2O3@C electrode exhibits a high specific capacity of 207 mAh/g at 2 A/g（6C）, good rate capability and cycling stability（133 m Ah/g after 1000 cycles）. With the activated carbon as the capacitive electrode and neutral sodium salts as the electrolyte, a 1.9 V hybrid supercapacitor is assembled,delivering a high energy density of 18.94 Wh/kg. The device can still maintain 72.3% of initial capacity after 650 cycles. The present work holds great promise for developing next-generation hybrid supercapacitors.
文摘采用乙炔等离子体浸没离子注入与沉积技术(P III-D)在医用涤纶缝合环材料表面沉积了一层类金刚石(DLC)薄膜。细菌黏附实验的结果证明沉积了类金刚石薄膜后的表面对五种细菌——金黄色葡萄球菌(S taphy lococcus aureus,SA)、表皮葡萄球菌(S taphy lococcus ep iderm id is,SE)、大肠杆菌(E scherich ia co li,EC)、绿浓杆菌(P seudom onas aerug inosa,PA)和白色念珠菌(C and ida a lb icans,CA)的黏附均有明显的减少(P<0.05)。计算细菌与材料之间的黏附自由能ΔFadh表明:细菌对PET表面的黏附自由能为负值,而细菌对DLC表面的ΔFadh>0,因此细菌对DLC表面黏附过程难于发生,即使黏附也是可逆的。
基金Supporting information for this article is available on the WWW under http：//dx.doi.org/10.1002/cjoc.201700398 or from the author.Acknowledgement This work was supported by the National Natural Science Foundation of China （Nos. U1510121, 21574076, 21501113, 61504076 and 21407100） and Shanxi Province （No. 2015021129）, the Program for the Top Young and Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi （No. 020352901014）, and Graduate Student Education Innovation Project in Shanxi Province （No. 2016BY009）.
文摘The binder-free composite films of reduced graphene oxide （rGO） and activated carbon derived from cotton （aCFC） have been fabricated and used as electrodes for electrochemical capacitors （ECs） to avoid the decrease of capacitive performance in traditional process caused by the additional binder. The optimal aCFC is prepared at 850 ℃ when the mass ratio of carbon and potassium hydroxide is 1 to 4. The optimal composite film prepared from the mass ratio of aCFC/GO = 2/1 exhibits porous structure, and has a specific surface area of 849.6 m^2·g^-1 and a total pore volume of 0.61 mL·g^-1. Based on the two-electrode system testing in 6.0 mol/L KOH electrolyte, the optimal composite has specific capacitance of about 202 Fog-1, 374 mF·cm^-2 and 116 F·cm^-3 in terms of mass, area and volume, and shows excellent rate capability and good cyclic stability （91.7% retention of the initial capacitance after 5000 cycles）. Furthermore, the assembled solid-state ECs by using KOH/polyvinyl alcohol as electrolyte show good mechanical stability and capacitive performances after repeated bending cycles. It is proved that this method is effective to fabricate binder-free electrodes for ECs and will open up a novel route for the reuse of waste cotton.
