Rapid developments towards a hydrogen economy driven by renewable energy powered Polymer Electrolyte Membrane Water Electrolysis (PEMWE) are expected to increase demand for iridium, the catalyst used in the oxygen evolution reaction at the anode. As one of the scarcest elements in the world, iridium prices have increased sharply, causing its share in the capital expenditure of PEMWE to also increase as the technology is deployed with greater intensity. Aligned within the broader scope of a project titled “Materials for hydrogen production to lower our dependence on existing ones”, abbreviated as MATHYLDE, this thesis experimentally investigated the feasibility of using thin membranes in facilitating the operation of PEMWEs at high current densities.