TY  - JOUR
AU  - Wagner, Maximilian
AU  - Lorenz, Oliver
AU  - Lohmann-Richters, Felix P.
AU  - Varga, Áron
AU  - Abel, Bernd
TI  - Study on solid electrolyte catalyst poisoning in solid acid fuel cells
JO  - Journal of materials chemistry / A
VL  - 9
SN  - 2050-7496
CY  - London ˜[u.a.]œ
PB  - RSC
M1  - FZJ-2021-02017
SP  - 11347-11358
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000644931100001
DO  - DOI:10.1039/D1TA01002F
UR  - https://juser.fz-juelich.de/record/892356
ER  -