Short thermal treatment of carbon felts for copper-based redox flow batteries

Luigi Faggiano, Gianluca Lacarbonara, Wouter Badenhorst, Lasse Murtomäki, Laura Sanz Rubio, Catia Arbizzani*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


Carbon felts are often used as electrode materials for various redox flow batteries (RFBs), and for optimal performance it is often required for them to be subjected to extended thermal treatment processes (25–30 h). However, the Cu(II)/Cu(I) redox couple employed in the copper RFB, at the positive electrode is significantly different when compared to the vanadium alternative. For this reason, the effect and duration of thermal treatment of the carbon felt on the performance of the copper-based RFB has to be determined. Both polyacrylonitrile and rayon carbon felts were subjected to thermal treatment for 6 and 25 h at 400 °C. The treated carbon felts were subsequently analysed using thermogravimetric analysis, resistivity determination, scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Additionally, the effect of the thermal treatment was also determined using electrochemical testing and in a redox flow cell.
Original languageEnglish
Article number230846
Number of pages10
JournalJournal of Power Sources
Early online date8 Dec 2021
Publication statusE-pub ahead of print - 8 Dec 2021
MoE publication typeA1 Journal article-refereed


  • carbon felt
  • copper redox flow batteries
  • CuRFB
  • RFB


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