Capacitance Measurements for Evaluating Electrochemical Double-Layer Models and Potentials of Zero Charge: A Reassessment.

ABSTRACT: Differential capacitances (DCAPs) derived from electrostatic Gouy-Chapman-type models for electrochemical double layers (DLs) typically show valley-, bell-, or camel-type profiles as a function of the potential, centered around the potential of zero charge. These DCAP profiles are routinely evaluated with measured potential dependencies of capacitances. Here, the influences of hydrogen evolution, oxygen reduction, and oxide formation on the potential dependence of the capacitance of a polished gold electrode are experimentally examined. These parasitic reactions are found to cause most of the potential-dependent capacitance features that are typically attributed to intrinsic DL properties. With these insights, the historical development of the literature regarding the development of the th

SUBMITTER: Schalenbach M 

PROVIDER: S-EPMC12276039 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature