Publication detail

Comparative Analysis of Thermal Activation on Felts and Continuous Carbon Filament Electrodes for Vanadium Redox Flow Batteries

NOEMÍ AGUILÓ AGUAYO, N. EBERT, T. AMADE, R. BERTRAN, E. OSPINA, R. RODRIGUEZ PEREIRA, J. DE LEON, C. BECHTOLD, T. PHAM, T.

Original Title

Comparative Analysis of Thermal Activation on Felts and Continuous Carbon Filament Electrodes for Vanadium Redox Flow Batteries

Type

journal article in Web of Science

Language

English

Original Abstract

Thermal treatments are commonly used to improve electrode kinetics in vanadium redox flow batteries (VRFB). The impact of the widely adopted thermal treatment-400 degrees C for least 24 hours-was investigated on polyacrylonitrile (PAN)-based continuous carbon filaments (tows) and compared to PAN-based graphite felts. Surface properties were assessed with scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and wettability measurements. The electrode activity was investigated via electrochemical impedance spectroscopy (EIS). Charge-transfer resistances and the constant phase element parameters related to the electric double layer were determined, revealing a correlation between enhanced electrode activity and increased double layer across all electrodes. An 8-hour 400 degrees C thermal treatment was sufficient to improve electrode activity for tows, whereas felts required longer durations, up to 24 hours, attributed to differences in the carbonization process employed for each material, with the tows undergoing continuous processing and the felts following a batch process. Three-electrode half-cell EIS measurements were conducted to elucidate positive and negative electrode contributions. Activated continuous carbon filament electrodes exhibited consistent electrode activities in both the catholyte (VO2+/VO2+) and anolyte (V3+/V2+), whereas the electrochemical activity of felts was limited by the electrode deactivation in the anolyte.

Keywords

Carbon fibers; Carbon felts; Carbon tows; EIS; Raman; Thermal treatment; Vanadium redox flow batteries; XPS

Authors

NOEMÍ AGUILÓ AGUAYO, N.; EBERT, T.; AMADE, R.; BERTRAN, E.; OSPINA, R.; RODRIGUEZ PEREIRA, J.; DE LEON, C.; BECHTOLD, T.; PHAM, T.

Released

4. 11. 2024

Publisher

WILEY-V C H VERLAG GMBH

Location

WEINHEIM

ISBN

2196-0216

Periodical

ChemElectroChem

Year of study

11

Number

21

State

Federal Republic of Germany

Pages from

1

Pages to

13

Pages count

13

URL

https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/celc.202400417

Full text in the Digital Library

http://hdl.handle.net/11012/250840

BibTex

@article{BUT191236,
  author="Noemí {Noemí Aguiló Aguayo} and Toni Alena {Ebert} and Roger {Amade} and Enric {Bertran} and Rogelio {Ospina} and Jhonatan {Rodriguez Pereira} and Carlos Ponce {de Leon} and Thomas {Bechtold} and Tung {Pham}",
  title="Comparative Analysis of Thermal Activation on Felts and Continuous Carbon Filament Electrodes for Vanadium Redox Flow Batteries",
  journal="ChemElectroChem",
  year="2024",
  volume="11",
  number="21",
  pages="13",
  doi="10.1002/celc.202400417",
  issn="2196-0216",
  url="https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/celc.202400417"
}