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PbTiO3(001) Capped with ZnO(112̅0): An ab Initio Study of Effect of Substrate Polarization on Interface Composition
Babatunde O Alawode1, Alexie M Kolpak1
1Department of Mechanical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
Abstract:
Catalytic conversion of CO2 into useful chemicals is an attractive alternative to expensive physical carbon sequestration methods. However, this approach is challenging because current chemical conversion methods employ high temperatures or pressures, thereby increasing cost and potentially leading to net carbon positive processes. In this paper, we examine the interface properties of ZnO(112̅0)/PbTiO3 and its surface interaction with CO2, CO and O. We show that the stoichiometry of the stable interface is dependent on the substrate polarization and can be controlled by changing the growth conditions. Using a model reaction, we demonstrate that a dynamically tuned catalysis scheme could enable significantly lower-energy approaches for CO2 conversion.
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