Abstract
The effect of thallium on palladium electrodeposition was investigated by the addition of thallium ion to ethylenediamine-palladium (II) complex solutions. Thallium ion resulted in underpotential deposition on copper and palladium electrodes and shifted the current-potential curves of the palladium electrodeposition to the more noble side. It also activated the electrodeposition of palladium and inhibited hydrogen evolution, so that the hydrogen content of deposits was decreased. In addition, thallium ion influenced the nucleation and growth processes of crystals so that the crystal size of deposits increased with greater overpotential, and it also changed the morphology of the deposits. Thus it is concluded thallium has catalytic effects on the electrodeposition of palladium.
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