Capacitive humidity sensors were made of nanometer barium titanate.The pellets were prepared under different pressures between 3920N to 7850N force.The capacitance changes in three orders of magnitude in the relative ...Capacitive humidity sensors were made of nanometer barium titanate.The pellets were prepared under different pressures between 3920N to 7850N force.The capacitance changes in three orders of magnitude in the relative humidity range of 10%～98%,indicating high humidity sensitivity of the sensors.At a certain measuring frequency,the capacitance of the sensors increases as increasing of the preparation pressure,while the sensitivity of the sensors basically remains the same.The frequencies corresponding to the peaks of the dielectric loss of the sensors move to the higher frequency direction as increasing of the relative humidity.At a certain humidity,the frequencies corresponding to the peaks of the dielectric loss move to the higher frequency direction as increasing of the preparation pressure.展开更多
Zinc-ion hybrid capacitors(ZHCs),integrating the high power density of supercapacitors and high energy density of batteries,are an emerging and sustainable electrochemical energy storage device.However,the poor rate p...Zinc-ion hybrid capacitors(ZHCs),integrating the high power density of supercapacitors and high energy density of batteries,are an emerging and sustainable electrochemical energy storage device.However,the poor rate performance,low utilization of active sites and unsatisfactory cycling life of capacitive-type cathode are still current technical challenges,while the uneven deposition of zinc anode generates a large number of dendrites,which can easily penetrate the separator to cause device failure,greatly limiting the commercialization prospects of ZHCs.Here,this review systematically elaborates on the current research progress of cathode materials for ZHCs,including preparation methods and structural design of porous carbon and heteroatom-doped porous carbon,deeply analyzing and discussing the energy storage mechanism and electrochemical behavior.Moreover,this review analyzes the causes and inhibition mechanisms of zinc dendrites,including electrolyte modification,induced uniform deposition of zinc and zinc anode modification,systematically elaborating on the three directions of current modification strategies for zinc anode.Finally,the current challenges and future development of cathode materials and dendrite suppression were prospected,developing a high-performance ZHCs.展开更多
Poly（3-alkyl）pyrroles containing phosphonic acid groups with different alkyl segment lengths were chemical synthesized and the properties were measured by FTIR and UV-Vis spectroscopy. FTIR and UV-Vis results showed...Poly（3-alkyl）pyrroles containing phosphonic acid groups with different alkyl segment lengths were chemical synthesized and the properties were measured by FTIR and UV-Vis spectroscopy. FTIR and UV-Vis results showed that the synthesized polymers were in a low doping level through chemical polymerization. By spin-coating on the surface of substrates, the polymer can be used as a humidity sensor. The change of DC electric current of the polypyrroles varies with the chain length of the alkyl substituents. The capacitance increases with the increase of the humidity and resistance decreases with the increase of humidity. This result is different from that ofpolypyrrole without alkyl substituents due to the influence of the phosphonic acid group. The sensor showed the resistive-type at high relative humidity, and the capacitive- type at the low relative humidity. The sensor exhibited very fast response to the change of environment humidity.展开更多
Development of biomaterial based flexible electronics has got intensive attention owing to the potential applications in the wearable and epidermal devices.Silk fibroin,as a natural textile material with excellent per...Development of biomaterial based flexible electronics has got intensive attention owing to the potential applications in the wearable and epidermal devices.Silk fibroin,as a natural textile material with excellent performance,has been widely concerned by industry and academy.However,the property of electrical insulation limits his development in the field of flexible electronics.In this paper,a regenerated silk fibroin/carbon nanotube(RSF/CNT)conductive film has been successfully fabricated and applied in flexible capacitive-type pressure sensor and wearable triboelectric nanogenerator by a facile method.The electrical conductivity and mechanical property of RSF/CNT film was optimized by investigating with different composite ratio from 10 to 90%(W_(RSF)/W_(CNT)).The RSF/CNT film has a good photothermal response and electric heating performance.We furtherly demonstrated that the RSF/CNT based sensor can be used as epidermal self-powered sensor for multifunction human motion monitoring and Morse code compilation.The observed research results have shown that the RSF/CNT film has a wide range of potential application prospects in the wearable electronics field.展开更多
基金The project is supported by the National Natural Science Foundation of China （60074031, 60474052）.
文摘Capacitive humidity sensors were made of nanometer barium titanate.The pellets were prepared under different pressures between 3920N to 7850N force.The capacitance changes in three orders of magnitude in the relative humidity range of 10%～98%,indicating high humidity sensitivity of the sensors.At a certain measuring frequency,the capacitance of the sensors increases as increasing of the preparation pressure,while the sensitivity of the sensors basically remains the same.The frequencies corresponding to the peaks of the dielectric loss of the sensors move to the higher frequency direction as increasing of the relative humidity.At a certain humidity,the frequencies corresponding to the peaks of the dielectric loss move to the higher frequency direction as increasing of the preparation pressure.
基金financially supported by the National Natural Science Foundation of China(No.52372228)Sichuan Science and Technology Program(No.2018RZ0074)。
文摘Zinc-ion hybrid capacitors(ZHCs),integrating the high power density of supercapacitors and high energy density of batteries,are an emerging and sustainable electrochemical energy storage device.However,the poor rate performance,low utilization of active sites and unsatisfactory cycling life of capacitive-type cathode are still current technical challenges,while the uneven deposition of zinc anode generates a large number of dendrites,which can easily penetrate the separator to cause device failure,greatly limiting the commercialization prospects of ZHCs.Here,this review systematically elaborates on the current research progress of cathode materials for ZHCs,including preparation methods and structural design of porous carbon and heteroatom-doped porous carbon,deeply analyzing and discussing the energy storage mechanism and electrochemical behavior.Moreover,this review analyzes the causes and inhibition mechanisms of zinc dendrites,including electrolyte modification,induced uniform deposition of zinc and zinc anode modification,systematically elaborating on the three directions of current modification strategies for zinc anode.Finally,the current challenges and future development of cathode materials and dendrite suppression were prospected,developing a high-performance ZHCs.
基金supported by the Fundamental Research Funds for the Central Universities,China(No.GK 200902008)
文摘Poly（3-alkyl）pyrroles containing phosphonic acid groups with different alkyl segment lengths were chemical synthesized and the properties were measured by FTIR and UV-Vis spectroscopy. FTIR and UV-Vis results showed that the synthesized polymers were in a low doping level through chemical polymerization. By spin-coating on the surface of substrates, the polymer can be used as a humidity sensor. The change of DC electric current of the polypyrroles varies with the chain length of the alkyl substituents. The capacitance increases with the increase of the humidity and resistance decreases with the increase of humidity. This result is different from that ofpolypyrrole without alkyl substituents due to the influence of the phosphonic acid group. The sensor showed the resistive-type at high relative humidity, and the capacitive- type at the low relative humidity. The sensor exhibited very fast response to the change of environment humidity.
基金This work was supported by Open Project Funding of the Key Laboratory of High Performance Fibers and Products,Science Foundation of Zhejiang Sci-Tech University(20202090-Y).
文摘Development of biomaterial based flexible electronics has got intensive attention owing to the potential applications in the wearable and epidermal devices.Silk fibroin,as a natural textile material with excellent performance,has been widely concerned by industry and academy.However,the property of electrical insulation limits his development in the field of flexible electronics.In this paper,a regenerated silk fibroin/carbon nanotube(RSF/CNT)conductive film has been successfully fabricated and applied in flexible capacitive-type pressure sensor and wearable triboelectric nanogenerator by a facile method.The electrical conductivity and mechanical property of RSF/CNT film was optimized by investigating with different composite ratio from 10 to 90%(W_(RSF)/W_(CNT)).The RSF/CNT film has a good photothermal response and electric heating performance.We furtherly demonstrated that the RSF/CNT based sensor can be used as epidermal self-powered sensor for multifunction human motion monitoring and Morse code compilation.The observed research results have shown that the RSF/CNT film has a wide range of potential application prospects in the wearable electronics field.
