โ Scribed by Marcella Cappadonia; Simin Krause; Ulrich Stimming
No coin nor oath required. For personal study only.
The effect of isotopic exchange (D us H) on the bulk electric conductivity and the static dielectric constant of acid polyhydrates, having a clathrate structure, were determined between 10 and 228 K (melting point). Protonated and deuterated acids show virtually identical Arrhenius plots of the conductivity above 120 K. Below that temperature they differ, the deuterated compound exhibits a smaller conductivity and a smaller dielectric constant as compared with the protonated form. The hydrogen and the deuterium evolution reactions were investigated at the interface Ag-solid 5.5 hydrated perchloric acid between 140 and 228 K. The gas evolution was found to depend strongly on temperature and isotope (D us H). At the solid-solid interface the hydrogen evolution occurs faster than the deuterium evolution at the same overpotential. A temperature dependence of the charge transfer coefficient is observed with na decreasing with decreasing temperature.
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