インピーダンス測定法によるパラジウムの電析反応におよぼすタリウムの影響

抄録

The effects of thallium on palladium electrodeposition reactions were investigated by impedance measurements. Ethylenediamine in the electrolyte formde an adsorption layer on the electrode surface and lowered the double layer capacitance Cd. However thallium ion in the electrolyte was deposited on the electrode surface at underpotential deposited, breaking the ethylenediamine adsorption layer and increasing Cd. In addition, the addition of thallium ion to the electrolyte resulted in secondary capacitive loops and inductive loops were observed at low frequency. The secondary loops reflected the activation of a crystal growth reaction with increasing overpotential, but the inductive loops did not correspond to the growth mode of the electrodeposits. These responses suggest that the hydrogen ion adsorption reaction as the rate determining step.