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

Authors: Minjung Lee; Nayoung You; Yunchan Shin; Honghyun Cho

Addresses: Graduate School of Chosun University, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju, 61452, South Korea ' Graduate School of Chosun University, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju, 61452, South Korea ' Green Energy Institute, Mokpo-Si, Jeollanam-do, 58656, South Korea ' Department of Mechanical Engineering, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju, 61452, South Korea

Abstract: 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.

Keywords: ionic liquid; thermal property; T-history; DSC; differential scanning calorimetry; TGA; thermogravimetric analysis; cation.

DOI: 10.1504/IJNT.2024.137411

International Journal of Nanotechnology, 2024 Vol.21 No.3, pp.131 - 139

Published online: 18 Mar 2024 *

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