Impact of electrochemical overoxidation on the performance metrics of PEDOT films: experimental and theoretical studies
Year: 2026
Type: article
Abstract: In this work, the electrochemical performance and surface characteristics of PEDOT and overoxidized PEDOT films were systematically investigated. Cyclic voltammetry (CV) results revealed that the PEDOT-modified electrode exhibited both the higher oxidation currents and the lower oxidation potentials compared to the overoxidized PEDOT-electrode, indicating enhanced electron transfer and catalytic efficiency. Whereas, overoxidation resulted in a significant reduction in current, reflecting a decrease in active area and diminished sensitivity. Scanning Electron Microscopy (SEM) confirmed these findings by showing loss of porosity and reduced surface area in the overoxidized PEDOT film. Overall, the combined CV and SEM analyses demonstrate that moderate PEDOT modification offers optimal electrochemical activity and structural integrity for sensing applications. The theoretical results indicated that the difference in current density between overoxidized and non-overoxidized PEDOT structures was consistent with the corresponding experimental data. In addition, the sheet resistance of the synthesized polymer films was evaluated using the four-point probe technique. Results revealed that PEDOT exhibited a lower sheet resistance than overoxidized PEDOT, indicating higher electrical conductivity and more efficient charge transport properties.
Source: Results in Chemistry
Institutions: Damghan University, University of Shahrood
Language: English
Subfield: Polymers and Plastics
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,870
OpenAlex ID: W7223041870