Experimental investigation on the thermophysical properties and heat storage/retrieval studies of [HMIM]⁺ cation-based ionic liquids for energy storage application

This study aims to examine the thermophysical properties and heat storage/retrieval properties of [HMIM][Tf2N], [HMIM][BF4], and [HMIM][PF6] ionic liquids containing [HMIM]+ cation-based. The experiments involve the analysis of thermal conductivity, specific heat, heat storage/retrieval characteristics, and surface tension. Based on these findings, the molar volume and volatilisation enthalpy were calculated. Additionally, a numerical analysis was conducted on [HMIM][Tf2N], [HMIM][BF4], and [HMIM][PF6] ionic liquids, and the vapour-liquid equilibrium (VLE) of R-134a to confirm the feasibility of thermal energy storage through evaporation latent heat recovery.