Pyrazolium Phase-Change Materials for Solar-Thermal Energy Storage

Karolina Matuszek, R. Vijayaraghavan, Craig M. Forsyth, Surianarayanan Mahadevan, Mega Kar, Douglas R. MacFarlane

Research output: Contribution to journalArticleResearchpeer-review

27 Citations (Scopus)


Thermal energy storage technology utilizing phase-change materials (PCMs) can be a promising solution for the intermittency of renewable energy sources. This work describes a novel family of PCMs based on the pyrazolium cation, that operate in the 100–200 °C temperature range, offering safe, inexpensive capacity and low supercooling. Thermal stability and extensive cycling tests of the most promising PCM candidate, pyrazolium mesylate (Tm=168±1 °C, ΔHf=160 J g−1±5 %, ΔHtotal v=495 MJ m−3±5 %) show potential for its use in thermal storage applications. Additionally, this work discusses the molecular origins of the high thermal energy storage capacity of these ionic materials based on their crystal structures, revealing the importance of hydrogen bonds in PCM performance.

Original languageEnglish
Pages (from-to)159-164
Number of pages6
Issue number1
Publication statusPublished - 9 Jan 2020


  • energy storage
  • ionic liquids
  • phase-change materials
  • pyrazole
  • renewable energy

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