As a promising flexible energy source for next-generation emerging electronic devices,the temperature adaptability and low-temperature performance retention of flexible zinc-air batteries(ZABs)remain a great challenge...As a promising flexible energy source for next-generation emerging electronic devices,the temperature adaptability and low-temperature performance retention of flexible zinc-air batteries(ZABs)remain a great challenge for their practical application.Herein,we report photothermal-promoted aqueous and flexible ZABs with enhanced performance under a wide temperature range via using Ni-doped Mn_(3)O_(4) /N-doped reduced graphene oxide(denoted as Ni-Mn_(3)O_(4) /N-rGO)nanohybrids as bifunctional electrocatalysts.Upon being exposed to near-infrared light,the Ni-Mn_(3)O_(4) /N-rGO exhibited a powerful photothermal effect,resulting in localized and immediate heating of the electrode.Such effects led to increased active sites,improved electrical conductivity,enhanced release of bubbles,and promoted surface reconstruction of the electrode catalyst as corroborated by simulation and operando Raman.Consequently,the catalytic performance was boosted,manifesting a superior activity indicatorΔE of 0.685 V with excellent durability.As expected,the corresponding photothermal-assisted rechargeable ZABs possessed an excellent maximum power density(e.g.,78.76 mW cm^(−2) at−10℃),superb cycling stability(e.g.,over 430 cycles at−10℃),and excellent flexibility from 25℃ to subzero temperature.Our work opens up new possibilities for the development of all-climate flexible electronic devices.展开更多
Bacterial infections are a major cause of chronic infections.Thus,antibacterial material is an urgent need in clinics.Antibacterial nanofibers,with expansive surface area,enable efficient incorporation of antibacteria...Bacterial infections are a major cause of chronic infections.Thus,antibacterial material is an urgent need in clinics.Antibacterial nanofibers,with expansive surface area,enable efficient incorporation of antibacterial agents.Meanwhile,structure similar to the extracellular matrix can accelerate cell growth.Electrospinning,the most widely used technique to fabricate nanofiber,is often used in many biomedical applications including drug delivery,regenerative medicine,wound healing and so on.Thus,this review provides an overview of all recently published studies on the development of electrospun antibacterial nanofibers in wound dressings and tissue me-dicinal fields.This reviewer begins with a brief introduction of electrospinning process and then discusses electrospun fibers by incorporating various types of antimicrobial agents used as in wound dressings and tissue.Finally,we finish with conclusions and further perspectives on electrospun antibacterial nanofibers as 2D biomedicine materials.展开更多
By combining the α/γ interface migration and the carbon diffusion at the interface in Fe-C alloys, a mathematical model is constructed to describe the mixed-control mechanism for proeutectoid ferrite formation from ...By combining the α/γ interface migration and the carbon diffusion at the interface in Fe-C alloys, a mathematical model is constructed to describe the mixed-control mechanism for proeutectoid ferrite formation from austenite. In this model, the α/γ interface is treated as non-equilibrium interface, i.e., the carbon concentration of austenite at γ/α interface is obtained through theoretical calculation, instead of that assumed as the local equilibrium concentration. For isothermal precipitation of ferrite in Fe-C alloys, the calculated results show that the rate of interface migration decreases monotonically during the whole process, while the rate of carbon diffusion from γ/α interface into austenite increases to a peak value and then decreases. The process of ferrite growth may be considered as composed of three stages: the period of rapid growth, slow growth and finishing stage. The results also show that the carbon concentration of austenite at γ/α interface could not reach the thermodynamic equilibrium value even at the last stage of ferrite growth.展开更多
Two-dimensional （2D） materials have attracted substantial attention in electronic and optoelectronic applications with the superior advantages of being flexible, transparent, and highly tunable. Gapless graphene exh...Two-dimensional （2D） materials have attracted substantial attention in electronic and optoelectronic applications with the superior advantages of being flexible, transparent, and highly tunable. Gapless graphene exhibits ultra-broadband and fast photoresponse while the 2D semiconducting MoS2 and GaTe exhibit high sensitivity and tunable responsivity to visible light. However, the device yield and repeatability call for further improvement to achieve large-scale uniformity. Here, we report a layer-by-layer growth of wafer-scale GaTe with a high hole mobility of 28.4 cm^2/（V.s） by molecular beam epitaxy. The arrayed p-n ）unctions were developed by growing few-layer GaTe directly on fhree-inch Si wafers. The resultant diodes reveal good rectifying characteristics and a high photovoltaic external quantum efficiency up to 62% at 4.8 μW under zero bias. The photocurrent reaches saturation fast enough to capture a time constant of 22 μs and shows no sign of device degradation after 1.37 million cycles of operation. Most strikingly, such high performance has been achieved across the entire wafer, making the volume production of devices accessible. Finally, several photoimages were acquired by the GaTe/Si photodiodes with reasonable contrast and spatial resolution, demonstrating the potential of integrating the 2D materials with silicon technology for novel optoelectronic devices.展开更多
基金The work was financially supported by the NationalNatural Science Foundation of China(Grant numbers:22109120,62104170, 52331009)the ZhejiangProvincial Natural Science Foundation of China(Grant numbers:LQ21B030002 , LY23F040001).
文摘As a promising flexible energy source for next-generation emerging electronic devices,the temperature adaptability and low-temperature performance retention of flexible zinc-air batteries(ZABs)remain a great challenge for their practical application.Herein,we report photothermal-promoted aqueous and flexible ZABs with enhanced performance under a wide temperature range via using Ni-doped Mn_(3)O_(4) /N-doped reduced graphene oxide(denoted as Ni-Mn_(3)O_(4) /N-rGO)nanohybrids as bifunctional electrocatalysts.Upon being exposed to near-infrared light,the Ni-Mn_(3)O_(4) /N-rGO exhibited a powerful photothermal effect,resulting in localized and immediate heating of the electrode.Such effects led to increased active sites,improved electrical conductivity,enhanced release of bubbles,and promoted surface reconstruction of the electrode catalyst as corroborated by simulation and operando Raman.Consequently,the catalytic performance was boosted,manifesting a superior activity indicatorΔE of 0.685 V with excellent durability.As expected,the corresponding photothermal-assisted rechargeable ZABs possessed an excellent maximum power density(e.g.,78.76 mW cm^(−2) at−10℃),superb cycling stability(e.g.,over 430 cycles at−10℃),and excellent flexibility from 25℃ to subzero temperature.Our work opens up new possibilities for the development of all-climate flexible electronic devices.
基金supported by the National Natural Science Foundation of China(Project No.51573103,No.21274094)2019 Foundation Research fostering project 21 and postdoctoral fund(2019SCU12007)from SiChuan University
文摘Bacterial infections are a major cause of chronic infections.Thus,antibacterial material is an urgent need in clinics.Antibacterial nanofibers,with expansive surface area,enable efficient incorporation of antibacterial agents.Meanwhile,structure similar to the extracellular matrix can accelerate cell growth.Electrospinning,the most widely used technique to fabricate nanofiber,is often used in many biomedical applications including drug delivery,regenerative medicine,wound healing and so on.Thus,this review provides an overview of all recently published studies on the development of electrospun antibacterial nanofibers in wound dressings and tissue me-dicinal fields.This reviewer begins with a brief introduction of electrospinning process and then discusses electrospun fibers by incorporating various types of antimicrobial agents used as in wound dressings and tissue.Finally,we finish with conclusions and further perspectives on electrospun antibacterial nanofibers as 2D biomedicine materials.
基金This work was supported by the National Natural Science Foundation of China under grant No.50075053the Emphasized Item of Development Funds of Science and Technology of Shanghai City,China(No.03H201).
文摘By combining the α/γ interface migration and the carbon diffusion at the interface in Fe-C alloys, a mathematical model is constructed to describe the mixed-control mechanism for proeutectoid ferrite formation from austenite. In this model, the α/γ interface is treated as non-equilibrium interface, i.e., the carbon concentration of austenite at γ/α interface is obtained through theoretical calculation, instead of that assumed as the local equilibrium concentration. For isothermal precipitation of ferrite in Fe-C alloys, the calculated results show that the rate of interface migration decreases monotonically during the whole process, while the rate of carbon diffusion from γ/α interface into austenite increases to a peak value and then decreases. The process of ferrite growth may be considered as composed of three stages: the period of rapid growth, slow growth and finishing stage. The results also show that the carbon concentration of austenite at γ/α interface could not reach the thermodynamic equilibrium value even at the last stage of ferrite growth.
基金This work was supported by the National Young 1000 Talent Plan, Pujiang Talent Plan in Shanghai, National Natural Science Foundation of China （Nos. 61322407, 11474058, and 11322441）, the Chinese Na- tional Science Fund for Talent Training in Basic Science （No. J1103204）, and Ten Thousand Talents Program for young talents. Part of the sample fabrication was performed at Fudan Nano-fabrication Laboratory. We acknowledge Yuanbo Zhang, Yizheng Wu, Zuimin Jiang, Likai Li, Boliang Chen for great assistance during the device fabrication and measurements.
文摘Two-dimensional （2D） materials have attracted substantial attention in electronic and optoelectronic applications with the superior advantages of being flexible, transparent, and highly tunable. Gapless graphene exhibits ultra-broadband and fast photoresponse while the 2D semiconducting MoS2 and GaTe exhibit high sensitivity and tunable responsivity to visible light. However, the device yield and repeatability call for further improvement to achieve large-scale uniformity. Here, we report a layer-by-layer growth of wafer-scale GaTe with a high hole mobility of 28.4 cm^2/（V.s） by molecular beam epitaxy. The arrayed p-n ）unctions were developed by growing few-layer GaTe directly on fhree-inch Si wafers. The resultant diodes reveal good rectifying characteristics and a high photovoltaic external quantum efficiency up to 62% at 4.8 μW under zero bias. The photocurrent reaches saturation fast enough to capture a time constant of 22 μs and shows no sign of device degradation after 1.37 million cycles of operation. Most strikingly, such high performance has been achieved across the entire wafer, making the volume production of devices accessible. Finally, several photoimages were acquired by the GaTe/Si photodiodes with reasonable contrast and spatial resolution, demonstrating the potential of integrating the 2D materials with silicon technology for novel optoelectronic devices.
