Abstract
The effect of H 2 and O 2 evolution on the mass transfer coefficient of the reduction of K 3Fe(CN) 6 and the oxidation of K 4Fe(CN) 6 at nickel electrodes was studied up to 105 mA/cm 2. The relation between the rate gas evolution and the mass transfer coefficient was found to be: log K = a + 0·25 log V for a H 2-evolving horizontal electrode and log K = a + 0·4 log V for an O 2-evolving horizontal electrode. Comparison was made between mass transfer coefficients at horizontal and vertical gas-evolving electrodes. Mass transfer coefficients at horizontal electrodes are much higher than at vertical electrodes.
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