PEMFC hydrogen dissociation

In the PEMFC, also known as polymer electrolyte fuel ceU (PEFC), hydrogen dissolves first at the anode surface of the Pt-based catalyst where it dissociates to protium, and then to proton to generate one electron per proton (H2 2H° 2H+ + 2e ). The magnitude of the specific surface area that provides the sites for the transition of hydrogen to protium is the key factor for the anode surface in a PEMFC. 

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