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A Guide to Concentration Alternating Frequency Response Analysis of Fuel Cells

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Published on: December 11, 2019

Effects of 1, 2, 4-Triazole Additive on PEM Fuel Cell Conditioning.

Nana Zhao¹, Zhiqing Shi¹, Régis Chenitz²

¹Energy, Mining & Environment Research Centre, National Research Council Canada, 4250 Wesbrook Mall, Vancouver, BC V6T 1W5, Canada.

|October 27, 2020

Summary

1,2,4-triazole additives in polymer electrolyte membranes (PEM) migrate to catalyst layers, impacting fuel cell performance. Post-treatment or cycling can mitigate these effects, crucial for melt-blown PEM quality control.

Keywords:

1, 2, 4-triazole additives conditioning contamination melt blowing processing proton exchange membrane (PEM) fuel cell

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Area of Science:

Materials Science
Electrochemistry
Chemical Engineering

Background:

Melt processing enables low-cost, mass production of polymer electrolyte membranes (PEM).
Azoles are used in PEM to enhance conductivity and as additives in melt blowing processes.
Understanding additive effects is critical for fuel cell performance and longevity.

Purpose of the Study:

To assess the impact of 1,2,4-triazole additive on PEM fuel cell conditioning.
To investigate the migration of triazole additives from membranes to catalyst layers.
To determine methods for mitigating performance loss caused by triazole additives.

Main Methods:

Electrochemical impedance spectroscopy (EIS) for diagnosing effects.
Cyclic voltammetry (CV) for performance assessment.
Constant current conditioning to evaluate fuel cell stability.

Main Results:

Triazole additives migrate from PEM to catalyst layers, affecting open circuit voltage (OCV) and conditioning.
Performance degradation can be temporary and is influenced by additive concentration.
Longer conditioning or CV cycling can remove or reduce the impact of triazole additives.

Conclusions:

Triazole migration significantly impacts PEM fuel cell performance.
Post-treatment steps are vital for managing residual additives in melt-blown PEM.
Quality control during melt blowing processing is essential to prevent fuel cell contamination.