▎ 摘　　要

The phase change enthalpy, thermal conductivity, thermal stability and thermal reliability of a novel reduced graphene oxide (r-GO) containing phase change material (PCM) r-GO/CaCl2 center dot 6H(2)O were investigated. The material was made by the aqueous dispersion of r-GO and calcium chloride dihydrate (CaCl2 center dot 2H(2)O) according to the mass ratio of CaCl2 and crystal water in CaCl2 center dot 6H(2)O. The thermal conductivity of the phase change material increased by similar to 80% when using similar to 0.018% (by weight) of r-GO with a similar to 2.7% decrease of enthalpy (i.e., storage capacity), while using similar to 0.018% of graphite led to an increase of thermal conductivity by similar to 14% and a decrease of enthalpy by similar to 5.6%. Additionally, the surface active agent for dispersing r-GO had the extra function of enhancing the system stability and reliability. The decomposing temperatures of r-GO/CaCl2 center dot H2O were higher than those of CaCl2 center dot 6H(2)O. After 100 cycles, the melting and crystallizing enthalpies of r-GO/CaCl2 center dot 6H(2)O decreased to 178.4 J g(-1) and 150.7 J g(-1) from 180.6 J g(-1) and 153.7 J g(-1), dropping by 1.2% and 2.0%, respectively, while for CaCl2 center dot 6H(2)O they decreased to 178.9 J g(-1) and 147.8 J g(-1) from 185.6 J g(-1) and 161.8 J g(-1), dropping by 3.7% and 8.7%, respectively. The thermal conductivity enhancement of CaCl2 center dot 6H(2)O with r-GO was markedly superior compared to that with graphite and other thermal conductive additives reported in previous literature, and the provided method (i.e., preparing aqueous dispersions of additives firstly and synthesizing hydrated salt PCMs with corresponding salts subsequently) was also applicable for other functional additives that cannot be directly dispersed well to modify the thermal properties of hydrated salt PCM systems.