Design and fabrication of functional porous air cathode materials with superior catalytic activity is still the key point for non-aqueous lithium-oxygen(Li-O2) batteries. Herein, inspired by the self-standing three-di...Design and fabrication of functional porous air cathode materials with superior catalytic activity is still the key point for non-aqueous lithium-oxygen(Li-O2) batteries. Herein, inspired by the self-standing three-dimensional(3D) structure of the natural spinach leaves, a unique binder-free and self-standing porous Au/spinach cathode for high-performance Li-O2 batteries has been developed. The carbonized spinach leaves serve as a superconductive current collector and an ideal porous host for accommodating catalysts. The Au/spinach cathode could offer enough spaces for accommodating the discharge products, shorten the distance of the oxygen and electrolyte diffusion, and promote the oxygen reduction reaction(ORR) and oxygen evolution reaction (OER) processes. This optimized Au/spinach cathode achieved a high specific area capacity of 7.23 mA‧h/cm2 at a current density of 0.05 mA/cm2 and exhibited excellent stability(280 cycles at 0.05 mA/cm2 with a fixed capacity of 0.2 mA‧h/cm2). The superior performance encourages the construction of more advanced cathode architectures by the use of bio-composites for Li-O2 batteries.展开更多
A photocatalyst of Au/ZnO(s-Au/ZnO)has been prepared via an approach,which uses spinach leaves with in terconnected hierarchical structure as sacrificial biological template.The resultant s-Au/ZnO has well maintained ...A photocatalyst of Au/ZnO(s-Au/ZnO)has been prepared via an approach,which uses spinach leaves with in terconnected hierarchical structure as sacrificial biological template.The resultant s-Au/ZnO has well maintained the physical characteristics of the spinach leaf and demonstrated superior photocatalytic performance as well as enhanced photocurrent generation capability.Moreover,functional sacrificial agents(AgNO3,ammonium oxalate(AO)and tert-butyl alcohol(TBA))have been employed to quench electrons,holes and hydroxyl radicals respectively to identify the active species of photocatalytic reaction and to investigate the mechanism of photocatalytic degradation.The facile method herein presented provides a convenient option for the preparation ofbio-inspired leaMike photocatalysts of ZnO-based nano-materials,holding potential applications in not only environmental purification but also solar-to-electric energy conversion.展开更多
本文以脱脂干菠菜叶为原料,用胰蛋白酶水解制备菠菜叶蛋白多肽.研究了酶解温度、时间、p H值及酶-底物浓度比(E/S%)对菠菜叶蛋白多肽制备率的影响,结果表明,温度37℃,时间14 h,p H 8.5,酶-底物浓度比2.2%为胰蛋白酶的最佳水解条件.在此...本文以脱脂干菠菜叶为原料,用胰蛋白酶水解制备菠菜叶蛋白多肽.研究了酶解温度、时间、p H值及酶-底物浓度比(E/S%)对菠菜叶蛋白多肽制备率的影响,结果表明,温度37℃,时间14 h,p H 8.5,酶-底物浓度比2.2%为胰蛋白酶的最佳水解条件.在此条件下,菠菜叶蛋白多肽的制备率可达86%.展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.51771177,51972141,21835002,21621001)the"111"Project of China(No.B17020)+6 种基金the Project of the Education Department of Jilin Province,China(No.JJKH20190113KJ)the Jilin Province Science and Technology Development Program,China(No.20190303104SF)the Jilin Province/Jilin University Co-construction Project-Funds for New Materials,China(No.SXGJSF2017-3)the Science and Technology Breakthrough Plan of Henan Province,China(Nos.202102210242,212102210186)the Key Scientific Research Project of Higher Education of Henan Province,China(No.21A150055)the Post Doctoral Innovative Talent Support Program,China(No.BX20180122)the China Postdoctoral Science Foundation,China(No.2019M651195).
文摘Design and fabrication of functional porous air cathode materials with superior catalytic activity is still the key point for non-aqueous lithium-oxygen(Li-O2) batteries. Herein, inspired by the self-standing three-dimensional(3D) structure of the natural spinach leaves, a unique binder-free and self-standing porous Au/spinach cathode for high-performance Li-O2 batteries has been developed. The carbonized spinach leaves serve as a superconductive current collector and an ideal porous host for accommodating catalysts. The Au/spinach cathode could offer enough spaces for accommodating the discharge products, shorten the distance of the oxygen and electrolyte diffusion, and promote the oxygen reduction reaction(ORR) and oxygen evolution reaction (OER) processes. This optimized Au/spinach cathode achieved a high specific area capacity of 7.23 mA‧h/cm2 at a current density of 0.05 mA/cm2 and exhibited excellent stability(280 cycles at 0.05 mA/cm2 with a fixed capacity of 0.2 mA‧h/cm2). The superior performance encourages the construction of more advanced cathode architectures by the use of bio-composites for Li-O2 batteries.
文摘A photocatalyst of Au/ZnO(s-Au/ZnO)has been prepared via an approach,which uses spinach leaves with in terconnected hierarchical structure as sacrificial biological template.The resultant s-Au/ZnO has well maintained the physical characteristics of the spinach leaf and demonstrated superior photocatalytic performance as well as enhanced photocurrent generation capability.Moreover,functional sacrificial agents(AgNO3,ammonium oxalate(AO)and tert-butyl alcohol(TBA))have been employed to quench electrons,holes and hydroxyl radicals respectively to identify the active species of photocatalytic reaction and to investigate the mechanism of photocatalytic degradation.The facile method herein presented provides a convenient option for the preparation ofbio-inspired leaMike photocatalysts of ZnO-based nano-materials,holding potential applications in not only environmental purification but also solar-to-electric energy conversion.
