Abstract
Diffusion to hollow platinum electrodes has been studied by chronopotentiometric techniques for the reduction of Ag + Fe(CN) 6 3− and H +. The decrease in the value of the quantity iτ 1 2 / AC with increasing τ, due to the cylindrically contracting diffusion field inside a hollow electrode, has been found to be equal and opposite to the collesponding increase in the value of iτ 1 2 / AC due to the cylindrically expanding diffusion field outside a wire electrode of equal radius. In addition, it has been shown that, because of this equal and opposite effect, solid and hollow electrodes of the same radius and area can be combined to make an electrode which behaves in chronopotentiometric experiments like a planar electrode.
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