Key Devices for Flexible Electronic Devices: China Developed New Graphene Capacitors
Hefei University of Technology released the news on the 12th: The school’s research team successfully prepared a graphene film and successfully assembled it into an all-solid-state flexible supercapacitor. This kind of flexible super capacitor can provide efficient and safe power supply for wearable devices. It is the key equipment for a new generation of flexible electronic devices. Relevant achievements were published on the 12th in the internationally renowned academic journal "Chemistry".
According to reports, graphene has become an ideal material for new types of energy storage devices because of its excellent optical, electrical, thermal and mechanical properties. However, due to the weak interface between graphene nanosheets and the lack of an effective assembly method, the development of ultra-thin, transparent, self-supporting graphene thin films, and the use of all-solid-state flexible supercapacitors still face enormous challenges.
The school's research team and its collaborators have used macro-scale nano-assembly techniques to successfully prepare a high-strength, self-supporting, ultra-thin transparent graphene film.
According to reports, the film consists of only two layers of graphene oxide monolayer film, the thickness of only 22 nm, without the need for auxiliary materials to achieve self-support, and can be achieved by increasing or decreasing the number of single-layer film thickness and performance controllable adjustment . At the same time, the film has a horizontal dimension of centimeters, with cutability and excellent stretchability.
The experimental results show that the new thin film can not only maintain excellent mechanical properties and optical properties, but also the all-solid-state flexible supercapacitor assembled from it has high volume capacitance value, good electromechanical stability, and exhibits excellent super Capacitor performance. After 7500 cycles of charge and discharge, the film capacitance value remains as high as 91.4%.
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