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Since the 1980s there has been a significant lowering of the platinum loading of polymer electrolyte fuel cell electrodes from about 4–10 mg cm−2(platinum black) to about 0.4 mg cm−2 or even less (carbon supported platinum), by the introduction of ionomer (liquid Nafion®) impregnated gas diffusion electrodes, extending the three-dimensional reaction zone. From the 1990s to the present studies have...
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