Abstract
The electrolytic separation factor (S factor) of hydrogen isotopes for platinum was measured by means of quantitative mass analysis. The S factor was 5.0±0.2 at 298 K in sulfuric solution. The value was discussed on the basis of the transition state method. The temperature effect on the S factor was observed and the activation energy difference of 7.2 kJ/mol (Δe=e D -e H ) was obtained. The origin of Δe was discussed, and it was revealed that the hydrogen evolution process on Pt is assigned to a slow recombination mechanism. The present S factor measurements were done in the overvoltage region. In this region, it was recognized that the S factor is independent of the electrode current density. The S factor in the undervoltage region was discussed by taking account of electrochemical studies reported previously.
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