Potentials of Zero Charge for Platinum(111)−Aqueous Interfaces: A Combined Assessment from In-Situ and Ultrahigh-Vacuum Measurements

摘要: The nature and magnitude of corrections to published estimates the potentials zero charge Epzc for Pt(111)−aqueous interfaces obtained by “CO charge-displacement” strategy are assessed comparing such in-situ electrochemical data with surface charge−potential information extracted from work function−surface composition related in ultrahigh vacuum (UHV). involve estimating excess metal densities remaining upon displacement aqueous inner layer chemisorbed CO. While resulting adjustment so-called potential total 0.1 M HClO4 interface is only small (ca. 25 mV), a larger correction corresponding “free-charge” value deduced, yielding ≈ 0.2 V versus SHE. A closely concordant estimate also UHV-based function data. substantial discrepancies values Pt(111)−acidic those means an ex−situ/electrode imme...