Objective – This study aims to address the degradation of proton exchange membrane (PEM) within an electrolyzer, a
key factor limiting its lifetime and efficiency, by developing a semi-empirical model. The model integrates
electrochemical factors, providing insights into membrane degradation.
Findings – The proposed model, validated with experimental data, reveals critical interactions that drive PEM aging and
highlights the influence of various parameters on the performance of aged electrolyzer. It also identifies operational
strategies that could help mitigating degradation, supporting optimized, durable electrolyzer performance, especially
under dynamic operating conditions caused by renewable energy sources.
Originality – This work presents a novel equivalent electrical model specifically tailored to simulate PEM aging,
establishing a predictive tool for setting optimal operating conditions. The model's unique approach offers valuable
guidance for operators aiming to extend PEM electrolyzer lifespan under variable operational conditions.