Developing an Automated Tool for Quantitative Analysis of the Deconvoluted Electrochemical Impedance Response of a Solid Oxide Fuel Cell

Energies

Domenico Borello¹  Andrea Monforti Ferrario²  Mohammad Alboghobeish²  Massimiliano Della Pietra²  Davide Pumiglia²  Stephen J. McPhail²  Sergii Pylypko³ 

[1] Dipartimento di Ingegneria Meccanica e Aerospaziale (DIMA), Sapienza University of Rome, Via Eudossiana, 18, 00184 Roma, Italy;ENEA Department of Energy Technologies and Renewable Sources, Energy Storage, Batteries and Hydrogen Production & Use (TERIN-PSU-ABI), Via Anguillarese, 00123 Rome, Italy;Elcogen AS, Valukoja 23, 11415 Tallinn, Estonia;

关键词: solid oxide fuel cell;    physicochemical processes;    electrochemical impedance spectroscopy;    distribution of relaxation times;    MATLAB tool;    electrochemical characterization;   

DOI  :  10.3390/en15103702

来源: DOAJ

【 摘 要 】

Despite being commercially available, solid oxide fuel cell (SOFC) technology requires further study to understand its physicochemical processes for diagnostics, prognostics, and quality assurance purposes. Electrochemical impedance spectroscopy (EIS), a widely used characterization technique for SOFCs, is often accompanied by the distribution of relaxation times (DRT) as a method for deconvoluting the contribution of each physicochemical process from the aggregated impedance response spectra. While EIS yields valuable information for the operation of SOFCs, the quantitative analysis of the DRT and its shifts remains cumbersome. To address this issue, and to create a replicable benchmark for the assessment of DRT results, a custom tool was developed in MATLAB to numerically analyze the DRT spectra, identify the DRT peaks, and assess their deviation in terms of peak frequency and DRT amplitude from nominal operating conditions. The preliminary validation of the tool was carried out by applying the tool to an extensive experimental campaign on 23 SOFC button-sized samples from three production batches in which EIS measurements were performed in parametric operating conditions. It was concluded that the results of the automated analysis via the developed tool were in accordance with the qualitative analysis of previous studies. It is capable of providing adequate additional quantitative results in terms of DRT shifts for further analysis and provides the basis for better interoperability of DRT analyses between laboratories.

【 授权许可】

Unknown