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Abstract
Unitized regenerative fuel cells (URFCs) offer a compelling energy storage solution by integrating both fuel cell and electrolyzer functionalities into a single device. This study evaluates the electrochemical performance of a URFC system running in fuel cell mode utilizing bifunctional Pt-RTO and Pt/C catalysts and Nafion membranes, tested under varying flowrates and backpressures. Linear sweep voltammetry (LSV) measurements were performed using a Scribner URFC test station to extract maximum current density and characterize operational trends. Across the full range of experiments, increasing oxygen flowrate and applying moderate to high backpressure improved maximum current densities, while low or zero backpressure significantly reduced performance. The highest current density observed was 119.1 mA/cm2 under 10 psi backpressure and 100 mL/min oxygen flowrate. These findings provide insight into mass transport and catalyst utilization challenges in URFCs and inform future strategies for optimizing device performance and reliability. Recommendations for future work include mathematical modeling, durability testing, and mechanical improvements to membrane-electrode assembly fabrication.
Document Type
Final Report
Class Name
Mechanical Engineering and Material Sciences Independent Study
Language
English (en)
Date of Submission
5-11-2025
Recommended Citation
Cho, Kai, "Electrochemical Performance Analysis of a URFC in Fuel Cell Operation Under Variable Flow and Backpressure Conditions" (2025). Mechanical Engineering and Materials Science Independent Study. 290.
https://openscholarship.wustl.edu/mems500/290