The Microporous Layer (MPL) is a carefully engineered interfacial component increasingly used in Proton Exchange Membrane (PEM) electrolyzers to enhance mass transport, catalyst utilization, and overall system stability. Positioned between the catalyst layer (CL) and the porous transport layer (PTL), the MPL consists of a controlled network of micro-scale pores designed to regulate water and gas movement within the electrochemical cell.
Recent advances in PEM electrolyzer technology, driven by the need to reduce both CAPEX and OPEX for competitive green hydrogen, have delivered: higher efficiency, lower precious-metal loadings, and improved membrane durability. As PEM electrolyzer technology continues to evolve, the role of an MPL has grown.
