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Peer-reviewedCC BYACS measurement science au

Electrochemical Impedance Spectroscopy of (Photo)electrochemical Systems: A Practical Guide.

  • Thomas Moehl1
  • Erin Service1
  • Wooseok Yang2,3
  • S David Tilley1
  1. 1Department of Chemistry, University of Zurich, Winterthurerstrasse 190, Zurich 8057, Switzerland.
  2. 2School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea.
  3. 3SKKU Institute of Energy Science and Technology (SIEST), Sungkyunkwan University, Suwon 16419, Republic of Korea.
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Abstract

Electrochemical impedance spectroscopy (EIS) is a powerful technique for investigating (photo)-electrochemical systems. Although several comprehensive introductions to EIS are available, the selection of experimental parameters and the subsequent data processing, fitting, and interpretation remain challenging, particularly for newcomers. Here, we address these challenges by providing a practical, beginner-oriented introduction to EIS that emphasizes both conceptual understanding and in-depth analysis. We discuss measurements under direct current and alternating current conditions, the use of equivalent circuits (ECs), and best practices for acquiring reliable and physically meaningful EIS data. To develop understanding in a modular and systematic way, we start from two well-defined benchmark systemsa metal-electrolyte interface and a silicon p-n junction diodeand then extend the analysis to a buried-junction photoelectrochemical device. This stepwise approach enables the construction and justification of a realistic EC model for the complete photoelectrochemical system and demonstrates how robust parameters can be extracted from EIS measurements.

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Cite

BibTeXRIS
BibTeX
@article{moehl2026electrochemical,
  title = {{Electrochemical Impedance Spectroscopy of (Photo)electrochemical Systems: A Practical Guide.}},
  author = {Thomas Moehl and Erin Service and Wooseok Yang and S David Tilley},
  journal = {ACS measurement science au},
  year = {2026},
  month = aug,
  doi = {10.1021/acsmeasuresciau.6c00109},
  url = {https://europepmc.org/article/MED/42921136},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Electrochemical Impedance Spectroscopy of (Photo)electrochemical Systems: A Practical Guide.
AU  - Thomas Moehl
AU  - Erin Service
AU  - Wooseok Yang
AU  - S David Tilley
PY  - 2026
DA  - 2026/08/07
JO  - ACS measurement science au
DO  - 10.1021/acsmeasuresciau.6c00109
UR  - https://europepmc.org/article/MED/42921136
AB  - Electrochemical impedance spectroscopy (EIS) is a powerful technique for investigating (photo)-electrochemical systems. Although several comprehensive introductions to EIS are available, the selection of experimental parameters and the subsequent data processing, fitting, and interpretation remain challenging, particularly for newcomers. Here, we address these challenges by providing a practical, beginner-oriented introduction to EIS that emphasizes both conceptual understanding and in-depth analysis. We discuss measurements under direct current and alternating current conditions, the use of equivalent circuits (ECs), and best practices for acquiring reliable and physically meaningful EIS data. To develop understanding in a modular and systematic way, we start from two well-defined benchmark systemsa metal-electrolyte interface and a silicon p-n junction diodeand then extend the analysis to a buried-junction photoelectrochemical device. This stepwise approach enables the construction and justification of a realistic EC model for the complete photoelectrochemical system and demonstrates how robust parameters can be extracted from EIS measurements.
SN  - 2694-250X
ER  -