Thermophysical Enhancement of Graphene Oxide-Enhanced Quaternary Nitrate for Concentrated Solar Power Applications

Yingchun Wang, Haonan Zhang, Hantao Liu (), Hong Hou, Yonghong Guo and Wenrui Chang
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Yingchun Wang: School of Mechanical Engineering, North University of China, Taiyuan 030051, China
Haonan Zhang: Key Laboratory of Shanxi Province for Solar Thermal Technology, Taiyuan 030051, China
Hantao Liu: School of Mechanical Engineering, North University of China, Taiyuan 030051, China
Hong Hou: Department of Energy and Power Engineering, Shanxi Institute of Energy, Jinzhong 030600, China
Yonghong Guo: Department of Energy and Power Engineering, Shanxi Institute of Energy, Jinzhong 030600, China
Wenrui Chang: Shanxi Wojin New Materials Co., Ltd., Lvliang 030051, China

Energies, 2025, vol. 18, issue 10, 1-15

Abstract: With the continuous progress of global renewable energy, the reliability of the performance of heat storage materials is becoming increasingly important. In this study, graphene oxide (GO) was used as an additive to investigate its influence on the heat storage performance of quaternary nitrate molten salt. Quaternary nitrate molten salts doped in different proportions of 0.5, 1.0, 1.5, and 2.0 wt.% were prepared by the high-temperature hot melting method, and their properties were characterized in detail. The results show that the optimal concentration value of graphene oxide nanosheets is 1.0 wt.%, at which point the thermal parameters such as the specific heat capacity and thermal conductivity of the molten salt are optimal. Meanwhile, differential scanning calorimetry and thermogravimetric analysis tests verified the enhanced effect of the thermal performance. Furthermore, transmission electron microscopy and scanning electron microscopy analyses indicated that the insertion and encapsulation of nanosheets in the channel structure between nitrate crystals were effective. The modification methods used in this paper can enhance the thermophysical properties of nitrates. Meanwhile, the methods proposed in this paper can provide new ideas for the practice of heat-requiring systems.

Keywords: graphene oxide; quaternary nitrate; molten salt; thermal storage; specific heat capacity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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