Abstract
In polymer electrolyte water electrolysis (PEWE), mass transport losses are the least understood overvoltage contribution. Underlying origin as well as correlation parameters with the micro-structure of the porous transport layer (PTL) are not identified. X-ray imaging has the potential to clarify the relation between oxygen transport and mass transport losses, but in the highly absorbing titanium porous structures the contrast between water and gas is weak. Therefore, imaging parameters need to be carefully tuned to identify the two phases.Using synchrotron light, X-ray tomographic microscopy was applied to study ex-situ and operando PEWE cells and the two-phase flow in the PTL (see image and rendering in Figure 1) and at the interface1,2 to the catalyst layer was observed. The combination of electrochemical characterization with X-ray imaging leads to better understanding of the controlling parameters and the related mass transport losses.
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