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As a new type of bendable and deformable electronic device, flexible electronic devices have attracted more and more attention.
Scientific research in recent years has also promoted the rapid development of flexible electronic devices in the fields of information, energy, medical care, and national defense. However, existing flexible electronic devices still have deficiencies such as high quality and difficult to recover from deformation.
Therefore, it is urgent to prepare flexible electronic devices with high mechanical stability and low quality. Sponge is a porous material with reversible deformation, which has been widely used in energy storage, sensors, photocatalysis and other fields.
The currently studied sponges are mainly divided into two categories: one is graphene and metal foam sponges based on three-dimensional interconnection structure; the other is elastic polymers such as polydimethylsiloxane (PDMS) and polyurethane (PU )sponge. Among the above sponges, PDMS-based sponges have the advantages of good fatigue resistance, long life, easy modification, and low cost. They have great application potential in the manufacture of sensors and other flexible electronic products.
Recently, the research group of Li Zhou, a researcher of the Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences, and the group of associate professor Zhou Xuechang, School of Chemistry and Environmental Engineering, Shenzhen University, used polypyrrole-copper metal sponge for the first time Integrated flexible electronic device.
According to the existing non-electrodeposition method, Yang Mengyan, a master student of Shenzhen University, prepared a copper metal sponge that is easy to deform and has a low density.
Li Zhe, PhD student of Beijing Institute of Nano Energy and assistant researcher Hu Kuan prepared flexible and stable polypyrrole-copper metal sponge by attaching polypyrrole, which makes this composite sponge have more stable and high electrical conductivity. Supercapacitors also provide a better choice of flexible electrodes.
They used polypyrrole-copper metal sponge on the capacitor and assembled it with polyvinyl alcohol-potassium hydroxide gel to form a sandwich structure, and obtained an all-solid two-electrode supercapacitor. On the one hand, the use of double-layer capacitors derived from the higher inner surface of the copper metal sponge, and on the other hand, the pseudo-capacitors generated from polypyrrole, optimize the structure and performance of the capacitor, and effectively improve the stability and cycle life of the capacitor. The induced current at the interface is also increased.
Ph.D. student Zou Yang used polypyrrole-copper metal sponge as the friction layer of the nano-generator and the electrode layer to prepare a porous, lightweight single-electrode friction nano-generator, and through the treatment of the material itself, effectively improved the nano-generator's Electrical output.
The researchers assembled the above friction nano-generator and supercapacitor into a device to produce a flexible electronic device that integrates energy conversion and energy storage functions.
The device can be compressed by 50% or bent by 180 ° without changing the performance. It is suitable for wearable devices. The energy of the 2.4V voltage generated by the friction nano-generator can be stored in multiple supercapacitors connected in series with it, and can drive the LED lamp to work. This research work provides a new direction for the application of polypyrrole-copper metal sponges, as well as new ideas for the development of wearable electronic devices and elastic multifunctional energy storage composite systems.
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