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000892356 1001_ $$0P:(DE-HGF)0$$aWagner, Maximilian$$b0$$eCorresponding author
000892356 245__ $$aStudy on solid electrolyte catalyst poisoning in solid acid fuel cells
000892356 260__ $$aLondon ˜[u.a.]œ$$bRSC$$c2021
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000892356 520__ $$aSolid acid fuel cells operate at intermediate temperatures utilizing a solid electrolyte (CsH2PO4, CDP). However, relatively little is known about the degradation mechanism and the topic is rarely addressed. Phosphate poisoning of the platinum catalyst is a well-known problem for fuel cells working with H3PO4 as electrolyte. With CsH2PO4 as electrolyte, phosphate poisoning is therefore likely to occur as well. In this study we show a fast and reversible degradation behavior of solid acid fuel cells and associate it with poisoning of the catalyst. After a decline in power output of around 50% within hours, an in situ reactivation of the cell to almost the initial performance was possible by multiple cycling between the voltage of 0.1 V and 2.0 V. A limitation of the effect to the cathode is shown and the underlying process was analyzed by changes in the low frequency domain of impedance measurements, which is indicating a catalyst poisoning, and by the dependency from the upper vertex voltage. By employing a micro porous current collector, a decrease in the low frequency domain as well as enhanced stability (<125 μV h−1 at 0.43 V) was achieved. This work extends from a detailed insight in the degradation mechanism of solid acid fuel cells, to providing a working electrode modification to prevent poisoning, establishing a promising electrode stability on a laboratory scale.
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000892356 7001_ $$0P:(DE-HGF)0$$aLorenz, Oliver$$b1
000892356 7001_ $$0P:(DE-Juel1)176513$$aLohmann-Richters, Felix P.$$b2
000892356 7001_ $$00000-0002-7094-9313$$aVarga, Áron$$b3
000892356 7001_ $$00000-0001-6032-1680$$aAbel, Bernd$$b4
000892356 773__ $$0PERI:(DE-600)2702232-8$$a10.1039/D1TA01002F$$gp. 10.1039.D1TA01002F$$p11347-11358$$tJournal of materials chemistry / A$$v9$$x2050-7496$$y2021
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000892356 8564_ $$uhttps://juser.fz-juelich.de/record/892356/files/Wagner_Maximilian%20et%20al.pdf$$yPublished on 2021-04-19. Available in OpenAccess from 2022-04-19.
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