Aqueous zinc ion batteries show prospects for next-generation renewable energy storage devices.However,the practical applications have been limited by the issues derived from Zn anode.As one of serious problems,Zn den...Aqueous zinc ion batteries show prospects for next-generation renewable energy storage devices.However,the practical applications have been limited by the issues derived from Zn anode.As one of serious problems,Zn dendrite growth caused from the uncontrollable Zn deposition is unfavorable.Herein,with the aim to regulate Zn deposition,an artificial solid–electrolyte interface is subtly engineered with a perovskite type material,BaTiO3,which can be polarized,and its polarization could be switched under the external electric field.Resulting from the aligned dipole in BaTiO3 layer,zinc ions could move in order during cycling process.Regulated Zn migration at the anode/electrolyte interface contributes to the even Zn stripping/plating and confined Zn dendrite growth.As a result,the reversible Zn plating/stripping processes for over 2000 h have been achieved at 1 mA cm^(−2) with capacity of 1 mAh cm−2.Furthermore,this anode endowing the electric dipoles shows enhanced cycling stability for aqueous Zn-MnO2 batteries.The battery can deliver nearly 100%Coulombic efficiency at 2 Ag^(−1) after 300 cycles.展开更多
Interface states are widely applied in waveguide devices.However,previous studies failed to achieve photonic and phononic interface states independent of each other in the same crystal structure depending on the behav...Interface states are widely applied in waveguide devices.However,previous studies failed to achieve photonic and phononic interface states independent of each other in the same crystal structure depending on the behavior of the crystal structure,i.e.,photonic or phononic crystals,making the function of interface states single.In this study,straight-line and circular photonic and phononic interface states were realized independently in sunflower-type crystals.In addition,with a defect and a metal barrier,interface states could remain almost undamaged.The results have the potential to achieve multifunction devices and reduce the cost of engineering applications.展开更多
To solve the problem of inaccurate boundary identification and to eliminate the spurious pressure oscillation in the previously developed immersed smoothed point interpolation method(IS-PIM),a new sharp-interface IS-P...To solve the problem of inaccurate boundary identification and to eliminate the spurious pressure oscillation in the previously developed immersed smoothed point interpolation method(IS-PIM),a new sharp-interface IS-PIM combining mass conservation algorithm,called Sharp-ISPIM-Mass,is proposed in this work.Based on the so called sharp-interface method,the technique of quadratic local velocity reconstruction has been developed by combining with the mass conservation algorithm,which enables the present method improve the accuracy of the velocity field and satisfy the mass conservation condition near the boundary field.So the proposed method would not encounter the problem of spurious mass flux.In addition,a new form of FSI force evaluation considering pressure and viscous force to perform a whole function from the fluid domain to fictitious fluid domain is introduced,which makes the present method obtain more accurate results of FSI force than the original one.Through the numerical studies of a number of benchmark examples,the performance of the Sharp-ISPIM-Mass has been examined and illustrated.展开更多
基金the partial financial support from the National Natural Science Foundation of China(21935003 and 21805182)National Key Research and Development Plan(2016YFB0901503)+1 种基金Shanghai Pujiang Program(18PJ1403800)the support from the Hundreds of Talents program of Sun Yat-sen University。
文摘Aqueous zinc ion batteries show prospects for next-generation renewable energy storage devices.However,the practical applications have been limited by the issues derived from Zn anode.As one of serious problems,Zn dendrite growth caused from the uncontrollable Zn deposition is unfavorable.Herein,with the aim to regulate Zn deposition,an artificial solid–electrolyte interface is subtly engineered with a perovskite type material,BaTiO3,which can be polarized,and its polarization could be switched under the external electric field.Resulting from the aligned dipole in BaTiO3 layer,zinc ions could move in order during cycling process.Regulated Zn migration at the anode/electrolyte interface contributes to the even Zn stripping/plating and confined Zn dendrite growth.As a result,the reversible Zn plating/stripping processes for over 2000 h have been achieved at 1 mA cm^(−2) with capacity of 1 mAh cm−2.Furthermore,this anode endowing the electric dipoles shows enhanced cycling stability for aqueous Zn-MnO2 batteries.The battery can deliver nearly 100%Coulombic efficiency at 2 Ag^(−1) after 300 cycles.
基金supported by the National Natural Science Foundation of China(11974182,12374257)the Fundamental Research Funds for the Central Universities(NC2022008)+1 种基金the Funding for Outstanding Doctoral Dissertation of Nanjing University of Aeronautics and Astronautics(NUAA)(BCXJ22-14)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX22_0326)。
文摘高灵敏度的自驱动紫外探测器在许多应用中都大有可为.本研究提出了一种一维ZnO基同结光电探测器,它包括表面覆盖着Ag纳米线的锑掺杂ZnO微米线(AgNWs@ZnO:Sb MW)、MgO缓冲纳米层和ZnO薄膜.该探测器在0 V偏压下对紫外光非常敏感,其性能参数包括约7个量级的开关比、292.2 mA W^(-1)的响应度、6.9×10^(13)Jones的比探测率,以及微秒量级的快速响应速度(上升时间16.4μs,下降时间465.1μs).特别是10μW cm^(-2)的微弱紫外光时接近99.3%的外量子效率.此外,本文系统研究了MgO纳米薄膜和表面修饰AgNWs对探测器件性能增强的机理.作为自驱动光接收器,该光电二极管被进一步集成到能够实时传输信息的紫外通信系统中.此外,基于AgNWs@p-ZnO:Sb MW/i-MgO/n-ZnO的同质结9×9阵列显示出均匀的光响应分布,可用作具有良好空间分辨率的成像传感器.这项研究有望为设计高性能紫外光检测器提供一条具有低功耗和可大规模建造的途径.
基金supported by the National Natural Science Foundation of China(Nos.61405058 and 62075059)the Natural Science Foundation of Hunan Province(Nos.2017JJ2048 and 2020JJ4161)+1 种基金the Key Project of Scientific Research of Hunan Provincial Education Department(No.21A0013)the Fundamental Research Funds for the Central Universities(No.531118040112)。
文摘Interface states are widely applied in waveguide devices.However,previous studies failed to achieve photonic and phononic interface states independent of each other in the same crystal structure depending on the behavior of the crystal structure,i.e.,photonic or phononic crystals,making the function of interface states single.In this study,straight-line and circular photonic and phononic interface states were realized independently in sunflower-type crystals.In addition,with a defect and a metal barrier,interface states could remain almost undamaged.The results have the potential to achieve multifunction devices and reduce the cost of engineering applications.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51639003,51809035)This work was supported by the High-technology ship research project of Ministry of Industry and Information Technology of China(Grant No.2017-614)+3 种基金the Joint Found for Equipment Pre Research and China Shipbuilding Industry Corporation(Grant No.614B042802-28)the Fundamental Research Funds for the Central Universities(Grant No.DUT2017TB05),the China Postdoctoral Science Foundation(Grant No.2018M641693)the Liaoning Revitalization Talents Program(Grant No.XLYC1908027)the Science Foundation of Hunan Province(Grant No.2019JJ50790)and the computation support of the Supercomputing Center of Dalian University of Technology.
文摘To solve the problem of inaccurate boundary identification and to eliminate the spurious pressure oscillation in the previously developed immersed smoothed point interpolation method(IS-PIM),a new sharp-interface IS-PIM combining mass conservation algorithm,called Sharp-ISPIM-Mass,is proposed in this work.Based on the so called sharp-interface method,the technique of quadratic local velocity reconstruction has been developed by combining with the mass conservation algorithm,which enables the present method improve the accuracy of the velocity field and satisfy the mass conservation condition near the boundary field.So the proposed method would not encounter the problem of spurious mass flux.In addition,a new form of FSI force evaluation considering pressure and viscous force to perform a whole function from the fluid domain to fictitious fluid domain is introduced,which makes the present method obtain more accurate results of FSI force than the original one.Through the numerical studies of a number of benchmark examples,the performance of the Sharp-ISPIM-Mass has been examined and illustrated.
