単結晶銀上への鉛のUnderpotential Deposition過程のIn Situ観測--光音響的手法によるアプロ-チ

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Underpotential deposition of Pb from Pb(ClO4)2 aqueous solutions onto Ag substrates has successfully been detected by photoacoustic (PA) technique. PA measurements were carried out on specimens of single crystalline silver, and the electrolyte used for underpotential deposition was an aqueous solution of NaClO4+Pb(ClO4)2+HClO4. The current-potential curve obtained showed clear peaks of Pb underpotential deposition for each crystal face ((100) or (111)), while the PA signal-potential curve showed a slight increase at the potential of underpotential deposition. This increase is thought to be caused by underpotential deposition of Pb. The slow transformation phenomena of Pb adsorbates on Ag (111) electrode surfaces has been previously reported by T. Vitanov and coworkers, and the present work has succeeded in detecting this phenomenon with respect to the (111) crystal face as a slight fluctuation in the PA signal.
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