Impact of plasma-induced surface chemistry on electrochemical properties of microfabricated pyrolytic carbon electrodes

Galina Pankratova*, Jesper Yue Pan, Stephan Sylvest Keller

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

94 Downloads (Pure)

Abstract

Plasma technology is a widely used approach for carbon activation and enhancing the surface energy by generating various functional groups. Gas selection is an important factor determining the type of functional groups to be formed on carbon surfaces. In this study, we investigate the impact of plasma-induced chemical surface alterations on performance of pyrolytic carbon as electrode material. Pyrolytic carbon electrodes were microfabricated by pyrolysis of SU-8 structures defined using UV lithography and treated using Ar, O2, N2 and air plasma gases. The resulting surface chemistry and geometry were characterized by X-ray photoelectron spectroscopy and atomic force microscopy. Close inspection of electrochemical properties was done by using both outer (Ru(NH3)63+/2+) and inner (Fe(CN)63-/4− and dopamine) redox systems. The electrochemical performances of the carbon electrodes treated with various plasma gases were compared based on information on heterogeneous electron transfer rates determined by cyclic voltammetry and electrochemical impedance spectroscopy. This work provides a fundamental insight into electrochemistry of plasma-modified pyrolytic carbon surfaces and strategies on how to enhance surface properties overcoming possible electron transfer limitations for future enhancement in carbon-based electrochemical applications.

Original languageEnglish
Article number139987
JournalElectrochimica Acta
Volume410
Number of pages14
ISSN0013-4686
DOIs
Publication statusPublished - 2022

Keywords

  • Heterogeneous electron transfer
  • Plasma treatment
  • Pyrolytic carbon
  • Surface chemistry

Fingerprint

Dive into the research topics of 'Impact of plasma-induced surface chemistry on electrochemical properties of microfabricated pyrolytic carbon electrodes'. Together they form a unique fingerprint.

Cite this