As a part of a programme studying the pH and potential variations inside artificial crevices, a number of semimicro pH electrodes based on the palladium-hydrogen system have been developed and characterized. Conventional hydrogen charged wire electrodes have been found to have a life of a few hours only, but by continually charging a palladium membrane from the rear, it has proved possible to prolong the life considerably. With palladium foil activated by anodization and palladization, and charged by contact with 1atm hydrogen gas, behaviour essentially the same as that of the platinum-hydrogen electrode has been achieved, but without the need to saturate the solution with hydrogen.
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