Aqueous zinc-tellurium(Zn-Te) batteries have garnered much attention due to their inherent safety and high specific capacity.Unfortunately,the problem of low utilization and severe volume expansion represents a signif...Aqueous zinc-tellurium(Zn-Te) batteries have garnered much attention due to their inherent safety and high specific capacity.Unfortunately,the problem of low utilization and severe volume expansion represents a significant obstacle to the development of aqueous Zn-Te batteries.Herein,a synergistic defect engineering and gradient pore structure strategy is proposed to construct tellurium nanoclusters/carbon composite cathode materials(DP-C/Te) for high-performance aqueous Zn-Te batteries.The gradient pore structure supplies confinement spaces that restrict crystalline tellurium formation,facilitating high-activity tellurium nanoclusters and enhancing structural stability.A defect-rich structure can accelerate the migration and aggregation of tellurium,not only leading to the formation of tellurium nanoclusters but also boosting the redox reaction of aqueous Zn-Te batteries.Additionally,robust C-O bonds can further facilitate the interfacial electron transfer.Consequently,the DP-C/Te cathode for aqueous zinc-tellurium batteries demonstrates sufficient specific capacity(481.75 mAh g^(-1) at 0.1 A g^(-1)),superior rate performance(114 mAh g^(-1) even at 3 A g^(-1))and reliable cycling stability(81% capacity retention at 1 A g^(-1) after 1100 cycles).Furthermore,this work offers a promising perspective for high-performance aqueous ZnTe batteries.展开更多
Design and optimization of electrode material structures are critical steps in the development of supercapacitors.This work presented a design strategy based on SiC nanowires(NWs)as supercapacitor electrode with gradi...Design and optimization of electrode material structures are critical steps in the development of supercapacitors.This work presented a design strategy based on SiC nanowires(NWs)as supercapacitor electrode with gradient pore structure,superhydrophilicity,and enhanced conductivity.SiCNWs were in-situ fabricated on a carbon fabric substrate radially via chemical vapor deposition(CVD),constructing conical channels with gradient pore sizes that generate capillary forces and promote ion transport.An ultrathin pyrolytic carbon(PyC)shell(4.98 nm)was coated on the SiCNWs,to improve electrical conductivity without compromising pore structure or wettability.SiCNWs@PyC electrodes with a diameter of∼0.93μm exhibited excellent electrochemical performance from 0 to 60℃.At 25℃and a current density of 0.2 mA/cm^(2),the areal capacitance of SiCNWs@PyC electrode was 32.48 mF/cm^(2),representing 227.58%of the areal specific capacitance of pure SiCNWs.At 60℃,the capacitance remained high at 28.09 mF/cm^(2) under the same current density.The in-situ growth strategy and high mechanical stability of the material enabled the symmetric supercapacitor to maintain outstanding rate performance and cycling stability across a wide temperature range.The SiCNWs@PyC core-shell nanostructure is a promising supercapacitor electrode material,offering valuable insights for the development of next-generation energy storage devices.展开更多
Superwetting surfaces have the potential to address oil pollution in water,through their ability to separate the two.However,it remains a great challenge to fabricate stable and efficient separation structures using c...Superwetting surfaces have the potential to address oil pollution in water,through their ability to separate the two.However,it remains a great challenge to fabricate stable and efficient separation structures using conventional manufacturing techniques.Furthermore,the materials traditionally used for oil-water separation are not stable at high temperature.Therefore,there is a need to develop stable,customizable structures to improve the performance of oil-water separation devices.In recent years,3D printing technology has developed rapidly,and breakthroughs have been made in the fabrication of complicated ceramic structures using this technology.Here,a ceramic material with a gradient pore structure and superhydrophobic/superoleophilic properties was prepared using 3D printing for high-efficiency oil-water separation.The gradient pore structure developed here can support a flux of up to 25434 L/m^(2)h,which is nearly 40%higher than that an analogous structure with straight pores.At 200℃,the oil-water separation performance was maintained at 97.4%.Furthermore,samples of the material exhibited outstanding mechanical properties,and chemical stability in a variety of harsh environments.This study provides an efficient,simple,and reliable method for manufacturing oil-water separation materials using 3D printing,and may have broader implications for both fundamental research and industrial applications.展开更多
基金financially supported by the Natural Science Foundation of Fujian Province(No.2024J011210)the Technology Innovation Project of Xiamen University of Technology(No.YKJCX2023073)
文摘Aqueous zinc-tellurium(Zn-Te) batteries have garnered much attention due to their inherent safety and high specific capacity.Unfortunately,the problem of low utilization and severe volume expansion represents a significant obstacle to the development of aqueous Zn-Te batteries.Herein,a synergistic defect engineering and gradient pore structure strategy is proposed to construct tellurium nanoclusters/carbon composite cathode materials(DP-C/Te) for high-performance aqueous Zn-Te batteries.The gradient pore structure supplies confinement spaces that restrict crystalline tellurium formation,facilitating high-activity tellurium nanoclusters and enhancing structural stability.A defect-rich structure can accelerate the migration and aggregation of tellurium,not only leading to the formation of tellurium nanoclusters but also boosting the redox reaction of aqueous Zn-Te batteries.Additionally,robust C-O bonds can further facilitate the interfacial electron transfer.Consequently,the DP-C/Te cathode for aqueous zinc-tellurium batteries demonstrates sufficient specific capacity(481.75 mAh g^(-1) at 0.1 A g^(-1)),superior rate performance(114 mAh g^(-1) even at 3 A g^(-1))and reliable cycling stability(81% capacity retention at 1 A g^(-1) after 1100 cycles).Furthermore,this work offers a promising perspective for high-performance aqueous ZnTe batteries.
基金supported by National Natural Science Foundation of China(52202047,524B2015)China Postdoctoral Science Foundation(2023T160530)+3 种基金Young Talent Fund of Association for Science and Technology in Shaanxi,China(20220435)the Creative Research Foundation of Science and Technology on Thermo-structural Composite Materials Laboratory(2022-JCJQ-LB-073-03)Joint Fund for Science and Technology Research of Henan Province and Henan Academy of Sciences(225200810002)Practice and Innovation Funds for Graduate Students of Northwestern Polytechnical University(PF2024054).
文摘Design and optimization of electrode material structures are critical steps in the development of supercapacitors.This work presented a design strategy based on SiC nanowires(NWs)as supercapacitor electrode with gradient pore structure,superhydrophilicity,and enhanced conductivity.SiCNWs were in-situ fabricated on a carbon fabric substrate radially via chemical vapor deposition(CVD),constructing conical channels with gradient pore sizes that generate capillary forces and promote ion transport.An ultrathin pyrolytic carbon(PyC)shell(4.98 nm)was coated on the SiCNWs,to improve electrical conductivity without compromising pore structure or wettability.SiCNWs@PyC electrodes with a diameter of∼0.93μm exhibited excellent electrochemical performance from 0 to 60℃.At 25℃and a current density of 0.2 mA/cm^(2),the areal capacitance of SiCNWs@PyC electrode was 32.48 mF/cm^(2),representing 227.58%of the areal specific capacitance of pure SiCNWs.At 60℃,the capacitance remained high at 28.09 mF/cm^(2) under the same current density.The in-situ growth strategy and high mechanical stability of the material enabled the symmetric supercapacitor to maintain outstanding rate performance and cycling stability across a wide temperature range.The SiCNWs@PyC core-shell nanostructure is a promising supercapacitor electrode material,offering valuable insights for the development of next-generation energy storage devices.
基金supported by a National Science and Technology Major Project(2017-VI-0007-0077)the National Defense Basic Scientific Research Program of China(JCIKYS2019607001)+3 种基金the National Defense S&T Pre-Research Foundation of China(6142905192509)the National Natural Science Foundation of China(51772246,51272210,50902112,and U1737209)the National Key R&D Program of China(2017YFB1103500 and 2017YFB1103501)Fundamental Research Funds for the Central Universities(3102019PJ008 and 3102018jcc002)。
文摘Superwetting surfaces have the potential to address oil pollution in water,through their ability to separate the two.However,it remains a great challenge to fabricate stable and efficient separation structures using conventional manufacturing techniques.Furthermore,the materials traditionally used for oil-water separation are not stable at high temperature.Therefore,there is a need to develop stable,customizable structures to improve the performance of oil-water separation devices.In recent years,3D printing technology has developed rapidly,and breakthroughs have been made in the fabrication of complicated ceramic structures using this technology.Here,a ceramic material with a gradient pore structure and superhydrophobic/superoleophilic properties was prepared using 3D printing for high-efficiency oil-water separation.The gradient pore structure developed here can support a flux of up to 25434 L/m^(2)h,which is nearly 40%higher than that an analogous structure with straight pores.At 200℃,the oil-water separation performance was maintained at 97.4%.Furthermore,samples of the material exhibited outstanding mechanical properties,and chemical stability in a variety of harsh environments.This study provides an efficient,simple,and reliable method for manufacturing oil-water separation materials using 3D printing,and may have broader implications for both fundamental research and industrial applications.
