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WebCatalysts on each side enable reactions and the membrane allows protons to pass through while keeping the gases separate. In this way cell potential is maintained and current is drawn from the cell producing electricity. A typical MEA is composed of a Polymer Electrolyte Membrane (PEM), two catalyst layers, and two Gas Diffusion Layers (GDL). Web4 mrt. 2024 · greenhouse effect, a warming of Earth ’s surface and troposphere (the lowest layer of the atmosphere) caused by the presence of water vapour, carbon dioxide, … Web13 dec. 2024 · What are greenhouse gases and why do we need to reduce the amount in the atmosphere? Find out more with Bitesize. For students between the ages of 11 and 14. libertyclassroom.com