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Pt/C/Nafion(R) composite electrodes prepared by a hot-pressed method were modified by chromium (Cr) for sensing hydrogen and oxygen in this study. The results indicate that the sensitivities of the Cr-modified electrodes in sensing hydrogen and oxygen rise markedly from 0.716 to 0.771 and from 0.414 to 0.533 μA per ppm, respectively, and the response and the recovery times on the Cr-modified electrode...