A proton-injecting technique for the measurement of hydration-dependent protonic conductivity

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Abstract
A technique for injecting protons directly from a hydrogen-saturated palladium-black electrode into a solid sample is described, together with the associated apparatus that may be used to measure protonic conductivity as a function of sample hydration. This technique is considered to be particularly useful for measurements on hydrogen-bonded solids, crystalline ionic hydroxides and acids, ceramics and biopolymers. Measurements for beta -cyclodextrin as a function of hydration are described and these results clearly indicate how the use of proton injecting and proton adsorbing electrodes may lead to a mobility-limited protonic conductivity, rather than to a result limited by the number of mobile protons available in the sample bulk.

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