Solid electrochemical energy storage for aqueous redox flow batteries: The case of copper hexacyanoferrate

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

  • Elena Zanzola
  • Solène Gentil
  • Grégoire Gschwend
  • Danick Reynard
  • Evgeny Smirnov
  • C. R. Dennison
  • Hubert H. Girault
  • Pekka Peljo

Organisaatiot

  • Ecole Polytechnique Federale de Lausanne
  • EPFL Valais Wallis

Kuvaus

All redox flow batteries suffer from low energy storage density in comparison with conventional Li-ion batteries. However, this issue can be mitigated by utilization of solid energy storage materials to enhance the energy storage capacity. In this paper we demonstrate the utilization of copper hexacyanoferrate (CuHCF) Prussian blue analogue for this purpose, coupled with N,N,N-2,2,6,6-heptamethylpiperidinyl oxy-4-ammonium chloride (TEMPTMA) as a soluble redox mediator to target the redox transitions of the solid material. In this case, indirect charging and discharging of CuHCF suspended in the electrolyte by electrochemically oxidized/reduced TEMPTMA was observed by chronoamperometry. Secondly, electrochemistry of different CuHCF composites with carbon black and multi-walled carbon nanotubes were investigated, highlighting that the high conductivity of the solid energy storage materials is crucial to access the maximal charge storage capacity. Finally, a CuHCF-TEMPTMA/Zn aqueous redox flow battery achieved stable cycling performances with high coulombic efficiency of 95% and volumetric capacity of 350 C mL−1.

Yksityiskohdat

AlkuperäiskieliEnglanti
Artikkeli134704
JulkaisuElectrochimica Acta
Vuosikerta321
TilaJulkaistu - 20 lokakuuta 2019
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 37155815