ADSORPTION DYNAMICS OFCO2ON HYDROGEN PRECOVEREDZn-ZnO(0001): A MOLECULAR BEAM STUDY

J. Wang and U. Burghaus ()
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J. Wang: Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, USA
U. Burghaus: Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, USA

Surface Review and Letters (SRL), 2004, vol. 11, issue 06, 521-529

Abstract: Presented are initial,S0, and coverage, Θ, dependent,S(Θ), adsorption probability measurements, respectively, ofCO2adsorption on a hydrogen precovered, polar,Zn-terminated surface ofZnO, parametric in the impact energy,Ei, and atomic hydrogen precoverage,ΘH. Furthermore,CO2Thermal Desorption Spectroscopy has been used to estimateΘHas well as the binding energy ofCO2onH/Zn-ZnO. TheS(Θ)curves are belowEi=0.56eV, consistent with precursor-mediated adsorption(S~const), and above that impact energy with adsorbate-assisted adsorption (Sincreases with Θ). Although a decrease in theCO2binding energy from 32.5 to 28.8 kJ/mol withΘHis present,S(Θ, ΘH)curves are consistent with a physical site blocking, as demonstrated by Monte Carlo Simulations.

Keywords: Adsorption probabilities; metal oxide surfaces; Zn-ZnO; CO2; hydrogen; molecular beam scattering; structure-activity relationship (SAR); surface defects; Monte Carlo Simulations (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1142/S0218625X04006463

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