Electrochemical Capacitance of CO-Terminated Pt(111) Dominated by the CO-Solvent Gap.

ABSTRACT: The distribution of electric fields within the electrochemical double layer depends on both the electrode and electrolyte in complex ways. These fields strongly influence chemical dynamics in the electrode-electrolyte interface but cannot be measured directly with submolecular resolution. We report experimental capacitance measurements for aqueous interfaces of CO-terminated Pt(111). By comparing these measurements with first-principles density functional theory (DFT) calculations, we infer microscopic field distributions and decompose contributions to the inverse capacitance from various spatial regions of the interface. We find that the CO is strongly electronically coupled to the Pt and that most of the interfacial potential difference appears across the gap between the terminating O an

SUBMITTER: Sundararaman R 

PROVIDER: S-EPMC6052449 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature