Study of degradation and spatial performance of low Pt-loaded proton exchange membrane fuel cells under exposure to sulfur dioxide in an oxidant stream
| Autor: | Ulrike Krewer, Tatyana V. Reshetenko, Vincent Laue, Kateryna Artyushkova |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Pollutant
Renewable Energy Sustainability and the Environment Drop (liquid) Energy Engineering and Power Technology chemistry.chemical_element Proton exchange membrane fuel cell 02 engineering and technology Contamination 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Sulfur Cathode 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering law Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Sulfur dioxide |
| Zdroj: | Journal of Power Sources. 458:228032 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2020.228032 |
| Popis: | Sulfur dioxide is a common air pollutant that has an adverse impact on proton exchange membrane fuel cells (PEMFCs). The present study reports the spatial performance and degradation of low-Pt PEMFCs exposed to trace concentrations of SO2 in a cathode feed stream. PEMFCs exposed to 2 ppm SO2 resulted in a performance loss of 240 and 345 mV for constant current holds of 0.2 and 0.8 A cm−2. However, the SO2 contamination of low-Pt fuel cells at 1.0 A cm−2 led to a drastic cell potential drop below 0.1 V from the initial 0.605 V and demonstrated that the cathode exposure to SO2 should be limited to concentrations significantly below 2 ppm for high power operating conditions. The observed voltage and spatial current behavior was attributed to the reduction of SO2 on Pt to zero-valent sulfur at potentials below 0.6 V. PEMFCs recovered performance only after potential cycling, insuring the oxidation of the formed S0 species at potentials higher than 0.8 V. A comparison of the electrochemical parameters before and after PEMFC poisoning revealed a substantial decrease in electrochemical surface area of up to 45.2% and a final performance loss of 60–100 mV. |
| Databáze: | OpenAIRE |
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