Research progress of photoreductive graphene micro supercapacitors in Dalian Institute of Chemical Engineering

Recently, Wu Zhongshuai, a researcher of the two-dimensional materials and energy devices research group of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, used the technology of UV light reduction of graphene oxide to realize the reduction of graphene oxide and the construction of graphene patterned microelectrode in one step, and batch prepared micro super capacitors with different configurations Relevant research results were published on ACS Nano (DOI: 10.1021 / acsnano 7b01390) The rapid development of flexible, miniaturized and intelligent electronic products has promoted the progress of micro super capacitors and other energy storage devices Traditional micro nano processing technology, such as wet lithography, is not suitable for mass production because of its complicated operation, process and high cost In addition, the steps of chemical reduction or thermal reduction need to be added for the preparation of micro supercapacitors with graphene oxide as precursor Therefore, the technology of high efficiency, low cost and large-scale production of graphene micro super capacitor is still facing many challenges The research team realized the efficient reduction of graphene oxide and the patterning of graphene microelectrode in one step by using the technology of UV reduction of graphene oxide, and prepared different micro super capacitors in batches Different from the existing preparation technologies, such as wet lithography and spray printing, this technology has the advantages of simple operation process, low cost, mild conditions, etc., and can effectively build different configurations and integrated micro power sources The capacitors show high scanning rate (200V / s), energy density (7.7mwh / cm3) and power density (312w / cm3) in ionic liquids This work provides a new way to simplify the preparation of graphene micro supercapacitor in one step, and proves that the electrochemical performance of the device can be significantly improved by adjusting the wettability of the interface between the film electrode and the electrolyte The above work was supported by NSFC, national key R & D plan, National Youth thousand talents plan, Liaoning Natural Science Foundation and other projects.