Membraneless energy conversion and storage using immiscible electrolyte solutions

Andrés F. Molina-Osorio, Alonso Gamero-Quijano, Pekka Peljo, Micheál D. Scanlon*

*Corresponding author for this work

Research output: Contribution to journalReview ArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Breakthrough alternative technologies are urgently required to alleviate the critical need to decarbonise our energy supply. We showcase non-conventional approaches to battery and solar energy conversion and storage (ECS) system designs that harness key attributes of immiscible electrolyte solutions, especially the membraneless separation of redox active species and ability to electrify certain liquid–liquid interfaces. We critically evaluate the recent development of membraneless redox flow batteries based on biphasic systems, where one redox couple is confined to an immiscible ionic liquid or organic solvent phase, and the other couple to an aqueous phase. Common to all solar ECS devices are the abilities to harvest light, leading to photo-induced charge carrier separation, and separate the products of the photo-reaction, minimising recombination. We summarise recent progress towards achieving this accepted solar ECS design using immiscible electrolyte solutions in photo-ionic cells, to generate redox fuels, and biphasic “batch” water splitting, to generate solar fuels.

Original languageEnglish
Pages (from-to)100-108
Number of pages9
JournalCurrent Opinion in Electrochemistry
Volume21
DOIs
Publication statusPublished - Jun 2020
MoE publication typeA2 Review article in a scientific journal

Keywords

  • Energy storage
  • Immiscible electrolyte solutions
  • Liquid–liquid interfaces
  • Membraneless redox flow battery
  • Redox fuel
  • Solar energy conversion
  • Solar fuel

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