Supercapacitors,with the merits of both capacitors for safe and fast charge and batteries for high energy storage have drawn tremendous attention.Recently,laser scribed graphene has been increasingly studied for super...Supercapacitors,with the merits of both capacitors for safe and fast charge and batteries for high energy storage have drawn tremendous attention.Recently,laser scribed graphene has been increasingly studied for supercapacitor applications due to its unique properties,such as flexible fabrication,large surface area and high electrical conductivity.With the laser direct writing process,graphene can be directly fabricated and patterned as the supercapacitor electrodes.In this review,facile laser direct writing methods for graphene were firstly summarized.Various precursors,mainly graphene oxide and polyimide were employed for laser scribed graphene and the modifications of graphene properties were also discussed.This laser scribed graphene was applied for electrochemical double-layer capacitors,pseudo-capacitors and hybrid supercapacitors.Diverse strategies including doping,composite materials and pattern design were utilized to enhance the electrochemical performances of supercapacitors.Featured supercapacitors with excellent flexible,ultrafinestructured and integrated functions were also reviewed.展开更多
For effective use of graphene and conducting polymer,the composite films of laser scribed gra-phene(LSG)combined with poly(3,4-ethylenedioxythiophene)(PEDOT)are prepared with a facile laser scri-bing technology.Each c...For effective use of graphene and conducting polymer,the composite films of laser scribed gra-phene(LSG)combined with poly(3,4-ethylenedioxythiophene)(PEDOT)are prepared with a facile laser scri-bing technology.Each component in the hybrid films provides unique and crucial function to achieve optimizedelectrochemical properties.In the presence of PEDOT nanoparticles,the LSG/PEDOT hybrid films are foundto possess the better energy storage ability.The electrochemical performances of the films are evaluated withcyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS),and galvanostatic charging-dischar-ging(GCD)techniques.Volumetric capacity of composite film(64.33 F/cm3)is much higher than that of purelaser-scribed graphene film(3.89 F/cm3).The hybrid film exhibits excellent charge/discharge rate and goodcycling stability,retaining 94.6%of its initial charge after 1000 cycles.The electrochemical performance im-provement is primarily due to the effect of PEDOT nanoparticles in prevention of agglomeration of LSG layersand the increased surface areas accessible to electrolyte ions.It is anticipated that the PEDOT nanoparticles in-serted into graphene oxide layers following laser scribing reduction procedure could be a promising large scalefabrication method for supercapacitor electrodes.展开更多
Humidity sensors have been widely applied to detect environment humidity in various fields. However, most of humidity sensors cannot provide performance needed for high sensitivity and fast response. We report one typ...Humidity sensors have been widely applied to detect environment humidity in various fields. However, most of humidity sensors cannot provide performance needed for high sensitivity and fast response. We report one type of capacitive-type humidity sensors composed of laser-scribed graphene(LSG) as sensing electrodes and graphene oxide/tin dioxide(GO/SnO2) as a sensing layer. The LSG is reduced graphene oxide(rGO) electrodes resulted from selective reducing of GO within a GO/SnO2 composite layer by laser scribing method, and the sensing layer is the un-scribed GO/SnO2 composite. The sensor fabrication is a one-step process which is facile and cost-efficient. When a mass ratio of GO:SnO2 in the composite reaches 1:1, the humidity sensor(named as LSG-GS1) has the best properties than other ratios, which exhibits high sensitivity in the range of 11%~97% relative humidity(RH). In addition, the LSG-GS1 also has very quick response/recovery time(20 s for adsorption and 18 s for desorption) when RH changes from 23% to 84%, and very good stability after monitoring for 41 days. Such excellent performances of the humidity sensor can be attributed to synergistic effect of SnO2 and GO within the composite layer.展开更多
基金the funding support of Zhangjiang National Innovation Demonstration Zone(ZJ2019-ZD-005)the support from National Natural Science Foundation of China(Grant No.11974247)the support of Shanghai Super Postdoctoral Incentive Programand and China Postdoctoral Science Foundation(No.2021M692137)。
文摘Supercapacitors,with the merits of both capacitors for safe and fast charge and batteries for high energy storage have drawn tremendous attention.Recently,laser scribed graphene has been increasingly studied for supercapacitor applications due to its unique properties,such as flexible fabrication,large surface area and high electrical conductivity.With the laser direct writing process,graphene can be directly fabricated and patterned as the supercapacitor electrodes.In this review,facile laser direct writing methods for graphene were firstly summarized.Various precursors,mainly graphene oxide and polyimide were employed for laser scribed graphene and the modifications of graphene properties were also discussed.This laser scribed graphene was applied for electrochemical double-layer capacitors,pseudo-capacitors and hybrid supercapacitors.Diverse strategies including doping,composite materials and pattern design were utilized to enhance the electrochemical performances of supercapacitors.Featured supercapacitors with excellent flexible,ultrafinestructured and integrated functions were also reviewed.
基金supported by National Natural Science Foundation of China(51477026,61471085)
文摘For effective use of graphene and conducting polymer,the composite films of laser scribed gra-phene(LSG)combined with poly(3,4-ethylenedioxythiophene)(PEDOT)are prepared with a facile laser scri-bing technology.Each component in the hybrid films provides unique and crucial function to achieve optimizedelectrochemical properties.In the presence of PEDOT nanoparticles,the LSG/PEDOT hybrid films are foundto possess the better energy storage ability.The electrochemical performances of the films are evaluated withcyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS),and galvanostatic charging-dischar-ging(GCD)techniques.Volumetric capacity of composite film(64.33 F/cm3)is much higher than that of purelaser-scribed graphene film(3.89 F/cm3).The hybrid film exhibits excellent charge/discharge rate and goodcycling stability,retaining 94.6%of its initial charge after 1000 cycles.The electrochemical performance im-provement is primarily due to the effect of PEDOT nanoparticles in prevention of agglomeration of LSG layersand the increased surface areas accessible to electrolyte ions.It is anticipated that the PEDOT nanoparticles in-serted into graphene oxide layers following laser scribing reduction procedure could be a promising large scalefabrication method for supercapacitor electrodes.
基金supported by the Fujian Provincial Department of Science and Technology (No. 2018H0041,2018H0042,2018T3010,2019T3017 and 2019T3024)。
文摘Humidity sensors have been widely applied to detect environment humidity in various fields. However, most of humidity sensors cannot provide performance needed for high sensitivity and fast response. We report one type of capacitive-type humidity sensors composed of laser-scribed graphene(LSG) as sensing electrodes and graphene oxide/tin dioxide(GO/SnO2) as a sensing layer. The LSG is reduced graphene oxide(rGO) electrodes resulted from selective reducing of GO within a GO/SnO2 composite layer by laser scribing method, and the sensing layer is the un-scribed GO/SnO2 composite. The sensor fabrication is a one-step process which is facile and cost-efficient. When a mass ratio of GO:SnO2 in the composite reaches 1:1, the humidity sensor(named as LSG-GS1) has the best properties than other ratios, which exhibits high sensitivity in the range of 11%~97% relative humidity(RH). In addition, the LSG-GS1 also has very quick response/recovery time(20 s for adsorption and 18 s for desorption) when RH changes from 23% to 84%, and very good stability after monitoring for 41 days. Such excellent performances of the humidity sensor can be attributed to synergistic effect of SnO2 and GO within the composite layer.
