Research Of Planar Micro-Supercapacitors Based On Self-Assembled Reduced Graphene Oxide At A Liquid-Air Interface

At present,the development of electronic products is developing towards the direction of micron level and nanoscale,resulting in the higher demand for energy storage system and the increasing demand for new energy storage system.The planar micro-supercapacitor as a new type of energy has emerged as the times require.The planar micro supercapacitor has a micro structure,so the ion transmission path is shorter and has a larger specific capacitance.Graphene has become a very ideal electrode material for the planar supercapacitor,because it has high conductivity,high electron mobility and unique two-dimensional structure.In this paper,graphene oxide(GO)thin films were prepared based on liquid-air interfacial self-assembly method,and the films were reduced by HI acid.After that,micro supercapacitors was prepared by using reduced graphene oxide(r-GO)films.In this paper,the GO thin films were prepared by gas liquid interface self-assembly method and HI acid reduction with different concentrations of r-GO aqueous solution as raw materials.After that,these films were characterized by AFM,XRD and XPS,and the four point probe test.The carbon and oxygen atom ratio of the prepared r-GO film is 7.7.In this paper,the r-GO film with different conductivity was obtained by adjusting the concentration of GO solution.Finally,the conductivity of r-GO film reached 620.29 Scm-1 when the concentration was2mg/ml.In this paper,all-solid-state supercapacitors and planar on-chip micro-supercapacitors with a interdigital type were fabricated by r-GO thin film electrode,and the electrochemical performance of the devices was tested.The results show that the electrochemical characteristics of the device are better with smaller scanning rate.At the low scan speed of 0.001 Vs-1,the area specific capacitance and stack specific capacitance of the device are 69.565 ?Fcm-2and2.334 Fcm-3,respectively.At the same time,its energy density of the device are324.224 ?Whcm-3,respectively.The conclusion about a planar on-chipmicro-supercapacitor with a Interdigital type indicate that at the low speed of 0.01Vs-1,the area of the device is 20.889 ?Fcm-2 and 6.528 Fcm-3,respectively.Its energy density is 0.91 m Whcm-3.At the high speed of 1000 Vs-1,the device has a high power density of 2.160 Wcm-3,and its cyclic stability is up to 98% after 2000 cycles.It is proved that the liquid-air interfacial self-assembly method and HI acid reduction method are very suitable for the preparation of electrode materials for preparing planar supercapacitors,and have great prospects in the preparation of electrode materials for planar supercapacitors.