Parasitic Effects in Impedance Spectrum of PEM Water Electrolysis Cells: Case Study of High-Frequency Inductive Effects: Article No. 2300375

Irene Franzetti, Artem Pushkarev, Ai-Lin Chan, Tom Smolinka

Research output: Contribution to journalArticlepeer-review

3 Scopus Citations

Abstract

Electrochemical impedance spectroscopy (EIS) is a powerful tool to characterize and distinguish electrochemical, electrical, and diffusive processes in an electrolysis cell. The EIS response with small impedance (mO) depends on components and materials of the cell, but often also on the electrical setup, cables, and connectors, leading to incorrect conclusions about the performance of the electrolysis cells. These parasitic effects are assessed via a short-circuit measurement and confirmed to be external from the membrane electrode assembly (MEA). In the setup, the inductive characteristic is described by a modified inductive reactance and must be included in the equivalent circuit model (ECM) which is fitting the cell EIS spectra in operation (in situ). If points of the spectra showing inductive characteristic (below x-axis in Nyquist plot) are excluded from the ECM evaluation, an artificially increased ohmic resistance at high frequencies is obtained. In addition, considerations on other components of the ECM can be misleading and significantly incorrect. The only way to avoid that inductive behavior caused by the external setup is incorrectly assigned to the ECM describing properties of the MEA is to include the inductive effects in the ECM analysis of in situ EIS measurements.
Original languageAmerican English
Number of pages10
JournalEnergy Technology
Volume11
Issue number12
DOIs
StatePublished - 2023

NREL Publication Number

  • NREL/JA-5900-86964

Keywords

  • electrochemical impedance spectroscopy
  • equivalent circuit model
  • high-frequency resistance
  • inductance
  • parasitic effects
  • proton exchange membrane water electrolysis

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