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Recently, Wu Zhongshuai, a researcher at the 2D Materials and Energy Devices Research Group of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, used the UV-light reduction of graphene oxide technology to achieve the reduction of graphene oxide and the graphene patterned microelectrode in a one-step process. Preparation of different configurations of micro-capacitors. Relevant research results published in ACS Nano (DOI: 10.1021 / acsnano.7b01390) on.
The rapid development of flexible, miniaturized and intelligent electronic products has promoted the progress of energy storage devices such as micro supercapacitors. Traditional micro-nano processing technology, such as wet lithography, cumbersome operation, complicated process, high cost, not suitable for mass production. In addition, the micro-scale supercapacitor prepared by using graphene oxide as a precursor also needs to increase the steps of chemical reduction or thermal reduction. Therefore, high-efficiency, low-cost, large-scale production of graphene micro-capacitor technology still faces many challenges.
The research team used UV-light reduction of graphene oxide technology to achieve efficient reduction of graphene oxide and patterning of graphene microelectrodes in one step, and batch preparation of miniature supercapacitors with different configurations. Different from the existing preparation technologies, such as wet lithography and spray printing, the technology has the advantages of simple operation flow, low cost, mild conditions and the like, and can efficiently construct micro-power sources of different configurations and integrated types. The prepared capacitor showed higher scan rate (200V / s), energy density (7.7mWh / cm3) and power density (312W / cm3) in ionic liquids. This work provided a new idea for simplifying the preparation of graphene micro-capacitors and demonstrated that the electrochemical performance of the device can be significantly improved by controlling the wettability of the interface between the thin film electrode and the electrolyte.
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