Enhanced heat storage performance of CaCl₂?6H₂O using BN nanosheet as an additive

Inorganic hydrated salt calcium chloride hexahydrate (CaCl2 center dot 6H(2)O) has a broad application prospect in the field of phase change energy storage due to its own characteristics. However, it has some problems such as large supercooling and serious phase separation, which limit its practical application. In this paper, boron nitride nanosheets (BNNSs) were applied in the CaCl2 center dot 6H(2)O system. It was found that the heterogeneous nucleation of CaCl2 center dot 6H(2)O can take place on the surface of BNNS. BNNS can solve the supercooling and heat transfer problems of CaCl2 center dot 6H(2)O effectively. At the same time, the addition of an appropriate amount of BNNSs can improve the stability of phase change composites. Compared with pure CaCl2 center dot 6H(2)O (supercooling was 22.06 degrees C and thermal conductivity was 0.382 W center dot m(-1)center dot K-1), the supercooling of CaCl2 center dot 6H(2)O/1 wt% BNNS composite was only 3.89 degrees C and the thermal conductivity was 3.918 W center dot m(-1)center dot K-1. CaCl2 center dot 6H(2)O/0.5 wt% BNNS composite has good cycling stability. This study has scientific significance for the development and application of BNNSs in the field of phase change energy storage.