Nonlinear Electrochemical Impedance Spectroscopy (NLEIS) is an electrochemical analysis tool which is directly applicable to both solid oxide fuel cells (SOFC) and PEMFCs. NLEIS probes, extracts and quantifies the harmonic response of AC current and voltage measurements. These harmonics provide characteristic information about the chemical and electrical processes that govern fuel cell performance.
Many electrochemical processes are non-linear, such as kinetics, mass transfer and material properties. The existing analysis tools in the marketplace, called “EIS”, only probe the pure-tone portion of current and voltage measurements and cut off the higher-order harmonics. In doing so EIS gives only a linear approximation of non-linear behavior, leading to ambiguous results. NLEIS captures the valuable higher-order harmonics to fully diagnose the impedance of non-linear processes occurring in fuel cells.
NLEIS has been used to successfully distinguish SOFC cathode kinetics and identify SOFC fuel transport limitations.
Nonlinear Electrochemical Impedance Spectroscopy (NLEIS) is one of the many software programs and tools created at the University of Washington available through our Express Licensing Program. These agreements have standard terms and conditions that allow for rapid licensing by companies, organizations, or individuals.
An internal evaluation license is available to academic and nonprofit research institutions at no charge in exchange for feedback.License
Download the commercial fee-based NLEIS Site License.License