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Citation: MENG Jian-Bo, SANG Ge, XUE Yan, CAO Wei, YE Xiao-Qiu. H/D Isotope Separation in SPE Water Electrolysis[J]. Chinese Journal of Applied Chemistry, ;2007, 24(12): 1424-1427. shu

H/D Isotope Separation in SPE Water Electrolysis

1.
State Key Laboratory of Suoeace Physics and Chemistry, Mianyang 621700

Corresponding author: MENG Jian-Bo,
Received Date: 8 January 2007
Available Online: 29 April 2007
Fund Project: 中国工程物理研究院科学技术基金资助项目(20060864) (20060864)

SPE water electrolysis was applied to H/D isotope separation.The separation factors(α) of H/D isotopes at IrRu/Nafion117/PbAg,IrRu/Nafion117/TiNi₃,IrRu/Nafion117/Ni,and C/Nafion112/Pt-TiO₂ MEA electrodes at 40℃ and 90×10^-3 A/cm² were about 4.49,3.48,3.14,and 4.53,respectively.Further study using IrRu/Nafion117/PbAg electrode was carried out.The separation factors using this electrode at 40℃ and current density i of 90×10^-3,150×10^-3,and 300×10^-3 A/cm² were 4.49,4.65,and 5.46,respectively,and were 3.76,4.11 and 4.38 at 60℃ with these current densities.When the temperature was 70℃ and i=90×10^-3 A/cm^-2,the separation factor was 3.53.The temperature dependence of α was found to follow the equation of ln_α=0.816×(10^-3/T)-1.112,and the calculated activation energy-ΔH_a was about 6 778 J/mol in the temperature range of 40~70℃.The results show that the separation factor increased with the increase of current density,but decreased with the increase of temperature.The isotopic effect on the H/D transport in Nafion membrane was also discussed.
- solid polymer electrolyte,
- water electrolysis,
- electrocatalysts,
- hydrogen isotope,
- separation
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