p H 2 0 and p O 2 0 are the oxygen/hydrogen partial pressure at the boundary between the membrane and the cathode/anode, respectively. For PEMWEs, migration of both Pt and Ir takes place within the membrane. The Pt band was discovered in the membrane around the hydrogen electrode similar to but not as significant as in PEMFCs, whereas the Ir band was found also near the hydrogen electrode due to Ir dissolution and redeposition.
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From Formation to Failure: The Role of Hydrogen Peroxide in Proton Exchange Membrane Technologies.
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