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The illustration presents the incorporation of a phosphoric acid (H3PO4) doped membrane prepared from one of the aromatic polyether copolymers described by Christina Morfopoulou, Aikaterini K. Andreopoulou, and Joannis K. Kallitsis on page 4325, into a high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC). In this schematic illustration only the two electrodes and the membrane are presented for clarity and simplicity, along with the inlet reactant gases, the transportation of protons along the membrane “hopping” between H3PO4 molecules, and the water and electricity produced. Emphasis is given on the polymeric chains bearing polar main chain pyridine and side carboxylic groups.