Binding Energy and Diffusion Barrier of Formic Acid on Pd(111)
Jan Fingerhut, Loïc Lecroart, Dmitriy Borodin, Michael Schwarzer, Stefan Hörandl, Alexander Kandratsenka, Daniel J. Auerbach, Alec M. Wodtke, Theofanis N. Kitsopoulos
Abstract
and thermal desorption. To disentangle the contributions of individual processes, we implement a mass-balance-based calibration procedure from which the branching ratio between desorption and decomposition for formic acid is determined. From experimentally derived elementary desorption rate constants, we obtain the binding energy 639 ± 8 meV and the diffusion barrier 370 ± 130 meV using the detailed balance rate model (DBRM). The DBRM explains the observed kinetic isotope effects.
Topics & Concepts
Formic acidDesorptionChemistryThermal desorptionActivation energyDiffusionDecompositionAdsorptionIsotopologueKineticsKinetic isotope effectPhysical chemistryAnalytical Chemistry (journal)MoleculeThermodynamicsOrganic chemistryDeuteriumAtomic physicsPhysicsQuantum mechanicsAdvanced Chemical Physics StudiesCatalytic Processes in Materials ScienceMachine Learning in Materials Science