FUEL CELL

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The invention aims at providing, without using an expensive and rare material, platinum black which is effectively inhibited from being poisoned with CO, H2S, SO4, or HCHO and a method for fluorination of platinum black. The platinum black is characterized by fluorine adsorbed on the surface thereof. The method for fluorination of platinum black is characterized by allowing platinum black to stand in an inert gas/fluorine mixed gas atmosphere in a chamber under a reduced pressure to make fluorine adsorbed on the surface of the platinum black.