Parasitic Effects in Impedance Spectrum of PEM Water Electrolysis Cells: Case Study of High-Frequency Inductive Effects
- Fraunhofer Institute for Solar Energy System (ISE ), Freiburg (Germany)
- Fraunhofer Institute for Solar Energy System (ISE ), Freiburg (Germany); North-West University (South Africa)
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
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 (mΩ) 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.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE National Renewable Energy Laboratory (NREL); Fraunhofer Cluster of Excellence; Department of Science and Innovation (DSI), South Africa
- Grant/Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1992308
- Report Number(s):
- NREL/JA--5900-86964; MainId:87739; UUID:0cc239e3-9f86-40da-a325-c44608cef223; MainAdminID:70006
- Journal Information:
- Energy Technology, Journal Name: Energy Technology Journal Issue: 12 Vol. 11; ISSN 2194-4288
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
A mathematical approach to survey electrochemical impedance spectroscopy for aging in lithium-ion batteries
Investigation of the suppression effect of polyethylene glycol on copper electroplating by electrochemical impedance spectroscopy