Shanghai Jiaotong University Successfully Develops New Solar Thermal Storage Materials and Technologies

[Editor's note] Over the past one hundred years, the Jiaotong University people have used their knowledge and wisdom to create numerous achievements and compose many "firsts" in modern and contemporary history. This is the wisdom of talent cultivation, the wisdom of scientific research, the wisdom of serving the society, and the wisdom of glory for the country. News Network has specially launched the column of “The University of Jiaotong University’s Wisdom” to focus on the wisdom of Jiaotong University and demonstrate the significant contribution made by the Jiaotong University to the national development and social progress.

Recently, the world-famous academic journal Nature Communications published the latest research results of Deng Tao's team in the field of solar thermal storage online by the Shanghai Jiaotong University's School of Materials Science and Engineering. This is another innovative breakthrough in the field of new thermal energy materials by the team following the achievements of Nature Energy, Advanced Materials, and Journal of the American Chemical Society (JACS). Shanghai Jiaotong University is the author of this article and the only communication author.

Through the development of a new type of solid-liquid phase change thermal storage composite material, the team dynamically regulated the distribution of nano-photothermal materials in phase change thermal storage substrates, and proposed a new fast-heating solar thermal storage solution. The method not only realizes the direct photothermal conversion of solar energy, but also greatly enhances the heat storage rate, ensures the high energy density of the heat storage system, and provides new research for the development of high-performance solar thermal storage technology and photothermal utilization technology. Ideas. Prof. Tao Tao, Associate Professor of Materials, and Prof. Deng Tao, Associate Professor of Jiaotong University, Michigan University, were the co-authors of the paper. The authors were Wang Zhongyong and Ye Qinxian, master students of Jiaotong University, and Dr. Tong Zhen, Ph.D., Michigan University Michigan University.

Heat storage is the core technology to solve the shortcomings of intermittent solar light, low energy density, and is the key to the development of solar thermal energy utilization technology. However, the thermal conductivity of current thermal storage materials is generally low, which severely limits the storage rate of thermal energy. It has always been one of the important factors restricting the development of solar energy storage technologies and the promotion of solar thermal utilization. Unlike traditional methods that rely on improving the thermal conductivity of heat storage materials to improve heat storage rates, the project team proposed a new method based on the rapid spread of solar photons in heat storage materials to directly convert solar energy into heat energy and store it in phase change materials. A corresponding physical model was established to reveal the new thermal storage mechanism. In order to solve the problem of the slow decline in transmission speed caused by the absorption of solar photons by the photothermal material, the team proposed the use of magnetic fields to dynamically regulate the distribution of photothermal materials in the phase change heat storage materials to enhance photon transmission and photothermal conversion, thereby realizing solar energy. Thermal long-term, efficient, uniform storage of phase change materials. In addition, the program also greatly reduces the amount of nano-materials in the composite materials, thus ensuring the high heat capacity and high stability of the heat storage system.

The research was funded by the National Key Research Program (No. 2017YFB0406100), the National Natural Science Foundation of China (51403127, 51521004, 51420105009, 21401129) and the Shanghai Chenguang Talent Plan (15CG06).

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