MEA Electrolyzers

A membrane electrode assembly (MEA) electrolyzer is high-performance electrochemical cell that has a layered structure with a central electrolyte membrane sandwiched between two catalyst layers (anode and cathode). MEA electrolyzer stands out as the most practical design for CO2 electrolysis and water splitting hydrogen and oxygen evolution reactions. The central proton-exchange membrane (PEM) or anion-exchange membrane  (AEM) allows ions to pass while separating the produced gases. The cathode and anode layers, loaded with catalysts, are the surfaces where electrochemical reactions occur.

With the membrane directly between the electrodes, MEA electrolyzer has a "zero-gap" structure which minimizes the distance for ions to travel and significantly reduce ohmic resistance and lowering the overall cell voltage. Also, due to lower resistance, MEA electrolyzers can operate at much higher current densities, often over 2 A/cm², compared to traditional alkaline systems (typically <0.4 A/cm²). This allows for higher hydrogen production rates in a smaller footprint.

The sandwiched central membrane provides a selective, robust barrier which prevents the mixing of produced hydrogen and oxygen, leading to high-purity hydrogen output (>99.99%).

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