Filter capacitors play an important role in altern-ating current(AC)-line filtering for stabilizing voltage,sup-pressing harmonics,and improving power quality.However,traditional aluminum electrolytic capacitors(AECs)...Filter capacitors play an important role in altern-ating current(AC)-line filtering for stabilizing voltage,sup-pressing harmonics,and improving power quality.However,traditional aluminum electrolytic capacitors(AECs)suffer from a large size,short lifespan,low power density,and poor reliability,which limits their use.In contrast,ultrafast supercapacitors(SCs)are ideal for replacing commercial AECs because of their extremely high power densities,fast charging and discharging,and excellent high-frequency re-sponse.We review the design principles and key parameters for ultrafast supercapacitors and summarize research pro-gress in recent years from the aspects of electrode materials,electrolytes,and device configurations.The preparation,structures,and frequency response performance of electrode materials mainly consisting of carbon materials such as graphene and carbon nanotubes,conductive polymers,and transition metal compounds,are focused on.Finally,future research directions for ultrafast SCs are suggested.展开更多
Surface enhanced raman spectrosscopy (SERS)has been used to studey the electrochemical coadsorption of TU at silver electrodes in solutions containing nitric acid ,sulphuric acid and perchloric acid respectively or an...Surface enhanced raman spectrosscopy (SERS)has been used to studey the electrochemical coadsorption of TU at silver electrodes in solutions containing nitric acid ,sulphuric acid and perchloric acid respectively or any two of them.It was found that these different anions can be induce-coadsorbed simultaneously on the silver surface through the protonated amino group of TU in the mixed acids ysstem.The coadsorption ability of the anions are in the order of So>NO?CLO at the potentials of at the potentials of The stability of TU on the surface of Agelectrode depends not only on the electrode potential but also on the nature of electrolyte anions coadsopbed.展开更多
为实现对于电导率的准确测量,研究Van Der Pauw原理及其应用于电导率绝对测量的理论依据,设计径轴二维可调的四电极结构.分析电极的对称性、电导池的封闭性对测量结果的影响,实验结果证明对称性好、结构封闭的Van Der Pauw法电导率计,...为实现对于电导率的准确测量,研究Van Der Pauw原理及其应用于电导率绝对测量的理论依据,设计径轴二维可调的四电极结构.分析电极的对称性、电导池的封闭性对测量结果的影响,实验结果证明对称性好、结构封闭的Van Der Pauw法电导率计,对溶液电导率具有较高的测量精度,并能够实现绝对测量.基于Van Der Pauw法的电导池常数κ仅与电极长度有关的原则,设计几种不同电极长度的电极,开展多种不同电导率溶液的测量实验,得出不同电导池常数κ的最佳测量范围.运用电导池常数为0.1cm-1的电极,对电导率为20~500μS/cm内的多个实际水样进行测量,相对误差小于1.0%.结果表明该新型电导率测量方法具有很好的应用前景和推广价值.展开更多
文摘Filter capacitors play an important role in altern-ating current(AC)-line filtering for stabilizing voltage,sup-pressing harmonics,and improving power quality.However,traditional aluminum electrolytic capacitors(AECs)suffer from a large size,short lifespan,low power density,and poor reliability,which limits their use.In contrast,ultrafast supercapacitors(SCs)are ideal for replacing commercial AECs because of their extremely high power densities,fast charging and discharging,and excellent high-frequency re-sponse.We review the design principles and key parameters for ultrafast supercapacitors and summarize research pro-gress in recent years from the aspects of electrode materials,electrolytes,and device configurations.The preparation,structures,and frequency response performance of electrode materials mainly consisting of carbon materials such as graphene and carbon nanotubes,conductive polymers,and transition metal compounds,are focused on.Finally,future research directions for ultrafast SCs are suggested.
文摘Surface enhanced raman spectrosscopy (SERS)has been used to studey the electrochemical coadsorption of TU at silver electrodes in solutions containing nitric acid ,sulphuric acid and perchloric acid respectively or any two of them.It was found that these different anions can be induce-coadsorbed simultaneously on the silver surface through the protonated amino group of TU in the mixed acids ysstem.The coadsorption ability of the anions are in the order of So>NO?CLO at the potentials of at the potentials of The stability of TU on the surface of Agelectrode depends not only on the electrode potential but also on the nature of electrolyte anions coadsopbed.
文摘为实现对于电导率的准确测量,研究Van Der Pauw原理及其应用于电导率绝对测量的理论依据,设计径轴二维可调的四电极结构.分析电极的对称性、电导池的封闭性对测量结果的影响,实验结果证明对称性好、结构封闭的Van Der Pauw法电导率计,对溶液电导率具有较高的测量精度,并能够实现绝对测量.基于Van Der Pauw法的电导池常数κ仅与电极长度有关的原则,设计几种不同电极长度的电极,开展多种不同电导率溶液的测量实验,得出不同电导池常数κ的最佳测量范围.运用电导池常数为0.1cm-1的电极,对电导率为20~500μS/cm内的多个实际水样进行测量,相对误差小于1.0%.结果表明该新型电导率测量方法具有很好的应用前景和推广价值.
