Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (1): 79-85.doi: 10.19799/j.cnki.2095-4239.2022.0451

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Preparation and thermal performance of nitrogen-doped porous carbon sponge-type mirabilite-based composite phase-change material

Liang WANG1(), Xin LIU1, Changan WANG1,2, Shengnian TIE1()   

  1. 1.New Energy Photovoltaic Industry Research Institute, Qinghai University, Xining 810016, Qinghai, China
    2.School of Materials Science and Engineering, Qinghua University, Beijing 100084, China
  • Received:2022-08-16 Revised:2022-09-05 Online:2023-01-05 Published:2023-02-08
  • Contact: Shengnian TIE E-mail:18369885733@163.com;tieshengnian@163.com

Abstract:

Given its issues with phase stratification and supercooling degree, mirabilite phase-change energy storage material, a type of inorganic hydrated salt with a high latent heat value and abundant source, has been restricted in its wide application in the field of energy storage. In this study, nitrogen-doped porous carbon is used as the carrier, and the mirabilite phase-change energy storage material is compounded with nitrogen-doped porous carbon to solve the problems in the practical application of mirabilite phase-change energy storage material. Through a hydrothermal reaction, nitrogen atoms were loaded on the polyurethane foam, and then the nitrogen-doped porous carbon sponge (NPCS-M) was obtained by high-temperature carbonization. The NPCS-M was used as the carrier of Na2SO4·10H2O/Na2HPO4·12H2O eutectic salt, and finally, the mirabilite-based composite phase-change material (NPCS-M) encapsulated by nitrogen-doped porous carbon sponge was prepared. The results showed that the nitrogen-doped porous carbon sponge was a honeycomb structure, with an N content of 4.3% and a specific surface area of 42.52 m2/g. The adsorption capacity of the material for the eutectic salt reached 120 times its weight. Simultaneously, the composite phase-change material's solid-liquid phase transformation properties after 1000, 3000, and 5000 cycles at 5—60 ℃ were studied. After 5000 cycles, the latent heat of the composite phase-change material was still above 130 J/g, and it can reduce the supercooling degree of eutectic salt after multiple cycles. The nitrogen-doped porous carbon sponge, a composite phase-change material, has a wide range of applications in the field of energy storage.

Key words: N doping, porous carbon sponge, stereotypy, eutectic salt, thermal performance

CLC Number: