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Recently, Yu Xuefeng, a researcher at the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, developed a new type of photothermal phase change energy storage microcapsules. Related work was published on Advanced Science under the title of Phase-Changing Microcapsules Incorporated with Black Phosphorus for Efficient Solar Energy Storage.
Converting sunlight into heat is an important way of solar energy utilization at present, and it has great application potential in the fields of seawater desalination, heating, construction, and solar energy storage systems. Phase change materials can efficiently store or release heat energy in the process of solid-liquid phase change, which provides feasibility for solving the imbalance of solar radiation in time, and can also solve the problem of temperature difference between day and night. However, traditional organic phase change materials are prone to leakage during phase change and cannot effectively absorb sunlight. In recent years, the phase change energy storage microcapsule technology that combines photothermal materials and phase change materials has gradually entered people’s field of vision. The introduction of photothermal materials can directly and efficiently absorb sunlight energy and convert it into heat energy, which is then stored and controlled by phase change materials. release. However, the current technology can only combine the photothermal material with the shell material, or wrap it in the shell layer or modify the surface of the shell material. This causes most of the heat generated by the photothermal material to be directly dissipated in the convection between the shell material and the outside world. Effectively store solar energy.
The Materials and Interface Research Center of Shenzhen Advanced Institute has established a microcapsule pilot and industrial platform with an annual output of 300 tons. The team has mastered the industrialized preparation technology of a variety of new aldehyde-free microcapsules, and developed a variety of microcapsule products such as thermochromic, photochromic, phase change energy storage, photoluminescence, and intelligent slow-release, which can be widely used in smart applications. Apparel, wearables, embedded devices, and medical implant devices.
In this work, the team designed an efficient solar storage phase change microcapsule. First, PMMA-modified two-dimensional black phosphorus nanosheets were prepared by a one-step method, which improved its dispersibility in dichloromethane and eicosan. Then, through the emulsification and volatilization method, a phase change microcapsule material with a high light-transmitting polymer PMMA as a shell material, a photothermal conversion material two-dimensional black phosphorus nanosheet and a phase change material eicosane as a core material was constructed. The phase change microcapsules have a high latent heat value (180 kJ/kg), show good thermal stability and excellent light-to-heat conversion and solar energy storage capabilities. Under light conditions, the well-dispersed two-dimensional black phosphorus in the microcapsules directly transfers the heat energy converted from solar energy to eicosane for storage, which is 3 times that of the sample with two-dimensional black phosphorus outside the capsule wall. The storage rate. This kind of photothermal phase change energy storage microcapsule material has application prospects in the field of solar energy storage, and also provides a new method for designing multifunctional phase change composite materials.
The research work was supported by the National Natural Science Foundation of China, the Key Frontier Science Project of the Chinese Academy of Sciences, and the Special Support Program of Guangdong Province.
Left: a schematic diagram of photothermal phase change microcapsule solar storage; right: a and b are the characterization of black phosphorus on the surface of the microcapsule and the internal scanning electron microscope; c: the photothermal conversion and storage temperature-time curve of the microcapsule material; d The picture shows the actual application effect diagram of the simulated photothermal phase change microcapsule; the e and f diagrams are the energy storage mechanism diagrams of two photothermal phase change microcapsules.
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