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The durability of high‐temperature polymer electrolyte membrane fuel cells (HT‐PEMFCs) was studied with phosphoric acid doped membranes of polybenzimidazole (PBI). One of the challenges for this technology is the loss and instability of phosphoric acid resulting in performance degradation after long‐term operation. The effect of the gas diffusion layers (GDL) on acid loss was studied. Four different...
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