The Electrochemical Heart

A simplified scheme of the electrochemical heart of a PEFC is displayed in Fig. 3, where the central solid electrolyte is contacted by two porous gas diffusion electrodes (GDLs), which are in intimate contact to the membrane surface (see below, three phase boundary). At the interface to the membranes, the GDLs contain nanoparticles of platinum (black dots) as electrocatalyst. 

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