Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session F66: Towards Application: Organics and Surfaces
8:00 AM–10:48 AM,
Tuesday, March 15, 2022
Room: Hyatt Regency Hotel -Grant Park D
Chair: Andreas Riemann, Western Washington University
Abstract: F66.00011 : Band-Engineered LaFeO3-LaNiO3 Thin Film Interfaces for Electrocatalysis of Water*
10:00 AM–10:12 AM
Presenter:
Rajendra Paudel
(Auburn University)
Authors:
Rajendra Paudel
(Auburn University)
Andricus Burton
(Auburn University)
Marcelo A Kuroda
(Auburn University)
Byron H Farnum
(Auburn University)
Ryan B Comes
(Auburn University)
We synthesized LaFeO3/LaNiO3 heterostructures using molecular beam epitaxy. We performed band offset calculation from XPS data. Our result shows that charge transfer at the interface is minimal but that the valence band offset between the top LaFeO3 layer, and the metallic LaNiO3 Fermi level is only ~0.2 eV, pinning the LaFeO3 in a p-type state. Models of the heterostructures using first-principles calculations within the density functional theory support this conclusion. Electrochemical measurements produced on these heterostructures revealed enhanced catalytic performance with respect to individual thin films. Comparison of these results with LaFeO3 thin films indicate that thickness as well as doping between n-type, intrinsic, and p-type all play a role in the catalysis that may be exploited to further improve the efficiency of oxygen evolution reactions.
*This work is supported by National Science Foundation grant.
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