Recently, Chen Wei, a researcher at the Suzhou Institute of Nanotechnology, Chinese Academy of Sciences, and a team of academicians Li Yuliang from the Institute of Chemistry of the Chinese Academy of Sciences and Professor Tao Xiaoming from the Hong Kong Polytechnic University have designed and fabricated an electrochemical driver based on a new material of graphene and a micromolecule driven from a graphite alkyne material. The discovery of the mechanism, to the high-energy conversion efficiency driving characteristics of macro-driven devices, carried out a comprehensive systematic study.
Among them, ionic polymer-metal composite (IPMC), also known as electrochemical drive. It is a sandwich structure composed of two layers of electrodes and ionic polymer. Under the action of electric field, it relies on the reversible deintercalation process of ions at the electrode interface to realize the conversion of electrical energy and mechanical energy. Due to its low voltage drive, flexible deformation and other characteristics, it has broad application prospects in software robots, smart wear and medical devices.
At present, the accepted mechanism of IPMC material driving mechanism in the academic world is the capacitive actuation mechanism. Under the driving voltage stimulation, a certain amount of ions are pre-expanded, embedded, and embedded in the electrode layer, causing reversible expansion and contraction effects of the electrode material. The effect causes the macro strain of the drive. In other words, the larger the energy storage of the electrode material, the stronger the driving effect.
Based on this mechanism, various high-energy storage nanomaterials have been tried as IPMC electrodes, and the driving performance has been greatly improved compared with the traditional IPMC materials, but there is still a big gap compared with practical applications, which once became difficult to understand. confused. The reason is that energy storage and drive performance are not always positively correlated, and there is a problem of energy conversion efficiency between them.
After a lot of research and exploration, the research team found that the energy conversion efficiency of the electrode is mainly determined by the complex characteristics of the electrical properties, pore configuration, molecular structure and mechanical properties of the material. Therefore, in order to achieve breakthroughs in drive performance and applications, it is necessary to develop new nanostructured active materials and explore new energy storage-conversion mechanisms.
The research team proposed and experimentally verified a new molecular driving mechanism-graphene alkyne alkyne interconversion effect, which is completely different from the traditional capacitive driving mechanism, which is based on the material structure change caused by the reversible coordination conversion effect. “Because conventional detection methods (such as Raman, infrared, etc.) are difficult to capture the coordination effect of this molecular scale, we have experimentally verified this molecule experimentally using highly sensitive in situ and frequency resonance spectroscopy techniques. Drive mechanism."
Chen Wei explained that it is because of the action of this active functional unit that the graphite alkyne IPMC flexible electrode not only exhibits excellent electrochemical energy storage characteristics, but also exhibits electro-mechanical energy conversion capability. Graphene propane driver has higher specific capacitance, good rate characteristics, and higher conversion efficiency than similar electrochemical transducing devices. The energy density is comparable to that of mammalian bio-muscle energy, which raises the performance of electrochemical actuators to a new level.
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