Study on solid electrolyte catalyst poisoning in solid acid fuel cells
| Autor: | Oliver Lorenz, Aron Varga, Felix P. Lohmann-Richters, Maximilian Wagner, Bernd Abel |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Working electrode Renewable Energy Sustainability and the Environment 02 engineering and technology General Chemistry Electrolyte Current collector 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalyst poisoning Cathode 0104 chemical sciences Catalysis law.invention Chemical engineering law Electrode Degradation (geology) General Materials Science ddc:530 0210 nano-technology |
| Zdroj: | Journal of materials chemistry / A 9, 11347-11358 (2021). doi:10.1039/D1TA01002F |
| Popis: | Solid acid fuel cells operate at intermediate temperatures utilizing a solid electrolyte (CsH2PO4, CDP). However, relatively little is known about the degradation mechanism and the topic is rarely addressed. Phosphate poisoning of the platinum catalyst is a well-known problem for fuel cells working with H3PO4 as electrolyte. With CsH2PO4 as electrolyte, phosphate poisoning is therefore likely to occur as well. In this study we show a fast and reversible degradation behavior of solid acid fuel cells and associate it with poisoning of the catalyst. After a decline in power output of around 50% within hours, an in situ reactivation of the cell to almost the initial performance was possible by multiple cycling between the voltage of 0.1 V and 2.0 V. A limitation of the effect to the cathode is shown and the underlying process was analyzed by changes in the low frequency domain of impedance measurements, which is indicating a catalyst poisoning, and by the dependency from the upper vertex voltage. By employing a micro porous current collector, a decrease in the low frequency domain as well as enhanced stability ( |
| Databáze: | OpenAIRE |
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