Isopotential Electron Titration of Ammonia Charge Transfer on Metal Catalysts.

ABSTRACT: Electron transfer between adsorbates and surfaces determines the binding strength and reactivity of chemical moieties on materials designed for separations and catalysis. To quantify electron exchange, the extent of charge transfer resulting from ammonia adsorption on a Ru surface was measured by isopotential electron titration (IET) on a Ru catalytic condenser, where isopotential conditions were maintained between Ru and silicon separated by an insulating HfO₂ layer during gas phase ammonia adsorption. Charge transfer upon ammonia adsorption on a Ru catalytic condenser increased from 40 to 1200 nC/cm² at 75 and 225 °C, respectively. Charge transfer measurements provided a direct estimate of ammonia adsorption thermodynamics on Ru without knowing surface coverages a p

SUBMITTER: Canavan JR 

PROVIDER: S-EPMC12848736 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature