This title appears in the Scientific Report :
2021
Please use the identifier:
http://dx.doi.org/10.1039/D1TA01002F in citations.
Please use the identifier: http://hdl.handle.net/2128/27888 in citations.
Study on solid electrolyte catalyst poisoning in solid acid fuel cells
Study on solid electrolyte catalyst poisoning in solid acid fuel cells
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...
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Personal Name(s): | Wagner, Maximilian (Corresponding author) |
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Lorenz, Oliver / Lohmann-Richters, Felix P. / Varga, Áron / Abel, Bernd | |
Contributing Institute: |
Elektrochemische Verfahrenstechnik; IEK-14 |
Published in: | Journal of materials chemistry / A, 9 (2021) S. 11347-11358 |
Imprint: |
London [u.a.]
RSC
2021
|
DOI: |
10.1039/D1TA01002F |
Document Type: |
Journal Article |
Research Program: |
Electrochemistry for Hydrogen Electrolysis and Hydrogen |
Link: |
Get full text Published on 2021-04-19. Available in OpenAccess from 2022-04-19. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/27888 in citations.
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 (<125 μV h−1 at 0.43 V) was achieved. This work extends from a detailed insight in the degradation mechanism of solid acid fuel cells, to providing a working electrode modification to prevent poisoning, establishing a promising electrode stability on a laboratory scale. |