High-speed 4D neutron computed tomography for quantifying water dynamics in polymer electrolyte fuel cells

Area of Science:

• Energy Science
• Materials Science
• Chemical Engineering

Background:

• Low-temperature polymer electrolyte fuel cells (LT-PEFCs) are crucial for zero-carbon energy strategies.
• Effective water management is a key challenge for enhancing LT-PEFC performance.
• Advanced characterization tools are needed to understand water dynamics within fuel cells.

Purpose of the Study:

• To develop and demonstrate a 4D high-speed neutron imaging technique for quantitative water analysis in LT-PEFCs.
• To enable time-resolved studies of water droplet formation and movement.
• To identify performance parameters for water management and cell classification.

Main Methods:

• Development of a 4D high-speed neutron imaging system.
• Application of the technique to visualize and quantify water evolution within fuel cell components.
• Analysis of droplet formation, motion, and distribution in flow fields.

Main Results:

• Successful quantitative analysis of local water evolution in LT-PEFCs.
• Time-resolved visualization of droplet dynamics and water accumulation.
• Identification of key water management performance parameters.

Conclusions:

• The developed 4D neutron imaging technique provides critical insights into fuel cell water management.
• This method supports the classification of fuel cells based on water management efficiency.
• Findings will aid in the design and optimization of next-generation fuel cell flow fields and computer modeling.