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Activating Nonreducible Oxides via Doping.

Niklas Nilius1, Hans-Joachim Freund2

  • 1†Carl von Ossietzky University, Department of Physics, 26111 Oldenburg, Germany.

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|April 21, 2015
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Summary
This summary is machine-generated.

Doping nonreducible oxides with aliovalent elements introduces electronic states, altering their chemical inertness. This study uses STM and XPS to show how dopants like Mo and Li modify oxide properties and surface reactions.

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Area of Science:

  • Surface Science
  • Materials Chemistry
  • Catalysis

Background:

  • Nonreducible oxides possess large band gaps, leading to chemical inertness and limited electron exchange.
  • Aliovalent dopants can introduce new electronic states within the band gap, potentially enabling charge-transfer processes.
  • Understanding dopant effects is crucial for modifying oxide reactivity in surface-catalyzed reactions.

Purpose of the Study:

  • To investigate the impact of aliovalent dopants (Mo, Li) on the physical and chemical properties of MgO and CaO.
  • To explore dopant-induced electronic states and their influence on surface adsorption and reactivity using advanced spectroscopy.
  • To elucidate the mechanisms of charge transfer between doped oxides and surface species.

Main Methods:

  • Scanning Tunneling Microscopy (STM) for local surface imaging and electronic structure analysis.
  • X-ray Photoelectron Spectroscopy (XPS) for probing electronic states and chemical composition on nonlocal and local scales.
  • Experiments conducted on well-defined crystalline oxide thin films under ultrahigh vacuum and low temperatures.

Main Results:

  • High-valence dopants (Mo) create filled states acting as electron donors, while low-valence dopants (Li) create holes as acceptors.
  • Dopants induce polarization effects and can lead to charge-compensating defects (e.g., vacancies) that may reduce doping efficiency.
  • Electron transfer observed from Mo in CaO to surface Au atoms and O2, forming activated superoxo-species with enhanced reactivity.

Conclusions:

  • Doping significantly alters the electronic properties and surface reactivity of nonreducible oxides.
  • Charge transfer processes are key mechanisms for enhancing surface reactions, as demonstrated by Mo-doped CaO.
  • Doping offers a promising strategy to improve the performance of oxides in surface-catalyzed reactions under realistic conditions.