Thermally Conductive Molten Salt for Thermal Energy Storage: Synergistic Effect of a Hybrid Graphite-Graphene Nanoplatelet Filler

Adi Lavi, Avia Ohayon-Lavi, Yelena Leibovitch, Shmuel Hayun, Efrat Ruse, Oren Regev

Research output: Contribution to journalArticlepeer-review

Abstract

Renewable energy technologies depend, to a large extent, on the efficiency of thermal energy storage (TES) devices. In such storage applications, molten salts constitute an attractive platform due to their thermal and environmentally friendly properties. However, the low thermal conductivity (TC) of these salts (<1 W m−1 K−1) downgrades the storage kinetics. A commonly used method to enhance TC is the addition of highly conductive carbon-based fillers that form a composite material with molten salt. However, even that enhancement is rather limited (<9 W m−1 K−1). In this study, the partial exfoliation of graphite to graphene nanoplatelets (GnP) in a molten salt matrix is explored as a means to address this problem. A novel approach of hybrid filler formation directly in the molten salt is used to produce graphite–GnP–salt hybrid composite material. The good dispersion quality of the fillers in the salt matrix facilitates bridging between large graphite particles by the smaller GnP particles, resulting in the formation of a thermally conductive network. The thermal conductivity of the hybrid composite (up to 44 W m−1 K−1) is thus enhanced by two orders of magnitude versus that of the pristine salt (0.64 W m−1 K−1).

Original languageEnglish
Article number2300053
JournalGlobal Challenges
Volume7
Issue number9
DOIs
StatePublished - 1 Sep 2023

Keywords

  • Raman mapping
  • exfoliation
  • graphene
  • molten salt
  • thermal conductivity

ASJC Scopus subject areas

  • General

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