Abstract
Gas crossover through the membrane poses a significant challenge to proton exchange membrane water electrolysers. This work investigates the influence of the position of platinum-based recombination interlayers integrated in the membrane on the anodic hydrogen in oxygen content. The results show that all interlayer positions reduce the anodic hydrogen content without performance losses compared to the reference without interlayer. However, an interlayer positioned closer to the anode is more effective than closer to the cathode. Further, the effect of the interlayer is more pronounced with increasing anode pressure.
Highlights
As high hydrogen contents were expected at low current densities and high cathode pressures, the anode product gas was diluted with an additional flow of oxygen (0.04 g min−1 or NOdi2l = 2.167 ∙ 10−5 mol s−1) applied with a mass flow controller (EL-FLOW Prestige, Bronkhorst) directly behind the anode outlet
It can be assumed that a further increase in anode pressure will lead to a further reduction of the anodic hydrogen content if the interlayer is positioned in the center or closer towards the cathode
It was shown that the polarisation behaviour is not significantly affected by the Pt-interlayers and their positions
Summary
It provided a theoretical assessment of the ideal position of a recombination layer for the reduction of both, hydrogen and oxygen gas fluxes across the membrane. Catalyst coated membranes (CCMs) with recombination interlayers (IL) close to the anode (IL_an), in the middle (IL_mid), close to the cathode (IL_cat) and a reference without interlayer (no_IL) were fabricated and examined regarding their polarisation behaviour and hydrogen crossover properties at different pressure conditions.
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