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Recently, the team of researcher Wang Zhenyang of the Institute of Intelligent Micro-nano Devices of the Institute of Intelligent Machinery of the Chinese Academy of Sciences’ Hefei Institute of Material Science has made new progress in solar thermal conversion and thermal energy storage and utilization.
Solar photothermal application is one of the simplest, most direct, and most effective ways to use solar energy. However, due to its small and discontinuous energy density after reaching the Earth, it is difficult to carry out large-scale development and utilization. For a long time, how to convert low-grade solar energy into high-grade thermal energy and enrich solar energy in order to maximize the use of solar energy has become a concern of researchers and has always been a topic of international concern. Recently, Wang Zhenyang's team can quickly and efficiently realize the characteristics of light-to-heat conversion according to the nanoparticles with plasma effect. By utilizing the characteristics of heat absorption and heat release of phase change materials, combined with the plasma effect of metal particles, they are organically combined to produce highly transparent light. Rate of thin film material. The thin film material not only has high-efficiency light-to-heat conversion capability, but also has constant temperature, heat storage and release capabilities. Related research results are published in "Solar Energy Materials and Solar Cells" (DOI: 10.1016/j.solmat.2017.02.017). The excellent photo-thermal conversion performance of the material can be widely applied in the related fields of solar thermal power generation devices, agricultural greenhouses and other related fields. At present, the relevant national patents have been applied for.
In recent years, Wang Zhenyang’s team has been devoted to the research of solar thermal conversion and thermal energy storage and utilization. For example, in the research of controllable heat storage and heat release, in order to ensure the realization of heat storage and heat release function, Wang Zhenyang’s team proposed a nano-interface confinement strategy to limit the hydrated salt confinement to a nanometer space where the scale is smaller than the diffusion of water molecules. Solved the problem of phase separation. At the same time, the huge silica interface also provides sufficient nucleation sites for the inorganic salt, which promotes the crystallization and solidification in the cooling process and overcomes the overcooling. This nano-constrained composite system has good cycle performance, and does not exhibit attenuation of heat storage performance even if it is recycled more than 100 times (J. Phys. Chem. C, 2011, 115: 20061). On the basis of realizing the heat storage and heat release function, it is also necessary to control when it will store heat and when it will release heat. Therefore, Wang Zhenyang's team designed a nanocomposite phase change system for the core-shell structure. By adjusting the interfacial interactions, a substantial adjustment of the phase transition temperature of palmitic acid was achieved, with a maximum reduction temperature of up to 50oC, which is the lowest reported so far. Range (Sol. Energ. Mat. Sol. C., 2012, 98:66; RSC Adv., 2013, 3:22326). Wang Zhenyang’s team also limited the phase change material polyethylene glycol (PEG) to the layer of graphene oxide, and achieved continuous adjustment of the solidification temperature by changing the layer spacing. For phase change heat storage, the solidification corresponds to an exotherm, which makes it possible to achieve controlled exotherm (J. Mater. Chem., 2012, 22:20166). In response to the problem of heat storage capacity in practical application of controlled heat storage, Wang Zhenyang's team designed a composite phase change system for nanometer core-shell structures. By introducing a hydrogen bonding network at the interface, hydrogen bonds were formed and fractured in the phase transition process, which in turn improved the Phase change enthalpy, compared with pure phase change materials, effective hot enthalpy increased from 273J/g to 374J/g, an increase of 36.9%, effectively improving the heat storage capacity (J. Phys. Chem. C, 2013 117:23412).
In addition, Wang Zhenyang's team has focused on waste heat enrichment and high-efficiency conversion and utilization. Through system integration of the devices, a thermoelectric conversion device based on waste heat power generation has been developed. Researchers have synthesized a novel composite of graphene and phase change materials by high-temperature evaporation and drying in air at room temperature, in which graphene is assembled in a three-dimensional network structure in phase change material polyethylene glycol (PEG). In the matrix, it provides a good path for rapid thermal conduction of the material. In addition, the team demonstrated for the first time the heat collection and storage of G-PEGs and their ability to provide heat sources for thermoelectric devices. G-PEGs provide heat flow for the rapid generation of overheated electrical devices that can light LED beads (Nanoscale, 2015, 7:10950; RSC Adv., 2017, 7:10683). The work was also reported by Atlas of Science on the subject of "Lighting up a flashlight without batteries", which attracted the attention of colleagues.
The above research work was supported by the National Natural Science Foundation of China and the Hefei Material Science and Technology Center's important project incubation fund.
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