Isotopic effects of hydrogen during the decomposition of water in electrolysis with a solid polymer electrolyte

The partition coefficients of hydrogen isotopes in the decomposition of water in electrolyzers with a solid polymer electrolyte are measured in a wide range of deuterium content in the initial water (from the natural content up to close to 100%), including for water containing trace concentrations of tritium. Equations describing the temperature dependence of the partition coefficients (temperature range 298-333 K) and the deuterium content dependence of the tritium partition coefficient are obtained. Partition coefficients are presented for binary isotopic mixtures protium-deuterium, protium-tritium, deuterium-tritium. 1 figure, 3 tables, 17 references.