Optimization of Flow Channels in a PEM Fuel Cell Based on a Multiobjective Evaluation.

Proton exchange membrane fuel cells (PEMFCs) are known for their cleanliness and high efficiency. However, the limited energy density and high cost are the main obstacles to this technology. This study aims to overcome these challenges and enhance the overall performance of the PEMFC. Five types of PEMFCs with different blockages are proposed and simulated in this study. Afterward, the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method is performed as a multiobjective evaluation. This study shows that the nozzle effect in the channel enhances the mass transfer of PEMFC and improves water and thermal management, resulting in a reduction of liquid water by up to 35.8%. The blockages benefit the output performance of the PEMFC. For example, the elliptical blockage shows the highest improvement in electrochemical conversion efficiency at 3.42%. The TOPSIS examines indices of power, exergy, economy, environment, and water and thermal management. The multiobjective evaluation shows that the elliptical blockage is more beneficial for PEMFC. This study provides an optimized design of the PEMFC flow channel and a new perspective to evaluate the structural improvement of PEMFC.