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Understanding the Electronic and Structural Effects in ORR Intermediate Binding on Anion‐Substituted Zirconia Surfaces

Journal Article · · ChemPhysChem
 [1];  [1];  [2];  [1]
  1. Department of Energy Storage and Conversion Technical University of Denmark 2800 Kongens Lyngby Denmark
  2. SUNCAT Center for Interface Science and Catalysis SLAC National Accelerator Laboratory Menlo Park California 94025 United States

Abstract

For oxygen reduction reaction (ORR), the surface adsorption energies of O and OH* intermediates are key descriptors for catalytic activity. In this work, we investigate anion‐substituted zirconia catalyst surfaces and determine that adsorption energies of O and OH* intermediates is governed by both structural and electronic effects. When the adsorption energies are not influenced by the structural effects of the catalyst surface, they exhibit a linear correlation with integrated crystal orbital Hamiltonian population (ICOHP) of the adsorbate‐surface bond. The influence of structural effects, due to the re‐optimisation slab geometry after adsorption of intermediate species, leads to stronger adsorption of intermediates. Our calculations show that there is a change in the bond order to accommodate the incoming adsorbate species which leads to stronger adsorption when both structural and electronic effects influence the adsorption phenomena. The insights into the catalyst‐adsorbate interactions can guide the design of future ORR catalysts.

Sponsoring Organization:
USDOE
OSTI ID:
2375892
Alternate ID(s):
OSTI ID: 2403665
Journal Information:
ChemPhysChem, Journal Name: ChemPhysChem Journal Issue: 14 Vol. 25; ISSN 1439-4235
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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