中断
电流(流体)
材料科学
计算机科学
工程物理
核工程
光电子学
电气工程
物理
工程类
嵌入式系统
微控制器
作者
Tobias Krenz,Torben Gottschalk,Lennard Helmers,Patrick Trinke,Boris Bensmann,Richard Hanke‐Rauschenbach
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2024-03-05
被引量:1
标识
DOI:10.1149/1945-7111/ad3057
摘要
Abstract It is common practice to characterize cells in polymer electrolyte membrane water electrolysis (PEMWE) using electrochemical impedance spectroscopy (EIS) and Tafel analysis, which require special equipment and operation procedures. Additionally, these techniques are not suitable for large industrial size cells with very low impedances. We present a simpler approach based on a novel evaluation of the current interrupt (CI) technique. The CI technique utilizes the voltage response after an instantaneous drop of electric current to identify the ohmic resistance R Ω , charge transfer resistance R ct and double-layer capacity C dl in a simplified equivalent circuit (EC) of the cell. A direct link to results of typical EIS and Tafel analysis can be defined by using the improved CI method which considers a non-linear activation resistance instead of a constant charge transfer resistance. Thereby, access to equivalent information as the established standard method is granted, while being applicable to all cell and stack sizes without requiring special equipment (e.g., impedance spectrometer). The agreement with experimental data is significantly improved over the assumption of a constant charge transfer coefficient. Consistency of the proposed interpretation with explicit EIS and Tafel analysis is demonstrated and options for industrial application of the evaluation scheme are discussed.
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