%0 Journal Article
%A Wagner, Maximilian
%A Lorenz, Oliver
%A Lohmann-Richters, Felix P.
%A Varga, Áron
%A Abel, Bernd
%T Study on solid electrolyte catalyst poisoning in solid acid fuel cells
%J Journal of materials chemistry / A
%V 9
%@ 2050-7496
%C London [u.a.]
%I RSC
%M FZJ-2021-02017
%P 11347-11358
%D 2021
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000644931100001
%R 10.1039/D1TA01002F
%U https://juser.fz-juelich.de/record/892356
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