Understanding characteristic electrochemical impedance spectral data of redox flow batteries with multiphysics modeling  

作　　者：Ayoob Alhammadi Abdulmonem Fetyan Rahmat Agung Susantyoko Ibrahim Mustafa Musbaudeen O.Bamgbopa 

机构地区：[1]Research&Development Centre,Dubai Electricity and Water Authority(DEWA),P.O.Box 564,Dubai,United Arab Emirates

出　　处：《Journal of Energy Chemistry》2025年第3期329-339,共11页能源化学(英文版)

基　　金：sponsored by the Dubai Electricity and Water Authority(DEWA)R&D centre,Dubai,United Arab Emirates。

摘　　要：Electrochemical impedance spectroscopy(EIS)is a robust characterization method to probe prevalent(electro)chemical processes in an electrochemical system.Despite its extensive utilization in fuel cell research,the application of EIS in redox flow battery systems particularly for simplified two-electrode full-cell configurations is more limited.Herein we attempt to strengthen the understa nding of cha racteristic EIS data of vanadium redox flow batteries by a combination of equivalent circuit modeling with a validated Multiphysics model analyzed under hydrodynamic conditions in frequency domain.Following a highlight of system linearity and stability concerns for EIS in redox flow batteries,we specifically use our combinatory approach to investigate the effects of different cell component properties on observed galva nostatic EIS spectra and accompanying fitted equivalent circuit element parameters.For the investigated two-electrode full-cell flow battery configuration with the same electrode material on both sides,the EIS spectral data is observed to be dominated by different mass or cha rge transport processes at different ends of the spectrum.Sensitivity analyses of both obtained EIS spectral data and fitted circuit elements parameters show that electrode morphological properties,membrane porosity,and electrolyte inflow conditions predominantly define the EIS spectral data.Insights from the type of analyses performed herein can facilitate flow battery cell/stack diagnostics and targeted performance improvement efforts.

关 键 词：Electrochemical impedance spectroscopy Redox Flow battery Multiphysics modeling Equivalent circuit Full cell 

分 类 号：TM911.1[电气工程—电力电子与电力传动]