Journal
SMALL
Volume 17, Issue 49, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202103632
Keywords
atomic scale precision; electrocatalysis; epitaxial oxide thin film; oxygen evolution reaction; sub-surface layer
Categories
Funding
- Basic Science Research Programs through the National Research Foundation of Korea [NRF-2021R1A2C2011340, NRF-2019R1A2C1005267, NRF-2020R1A2C1006207]
- Oregon State University
- Link Foundation Energy Fellowship
- National Science Foundation [NNCI-2025489]
- National Science Foundation-Major Research Instrumentation program [DMR-1429765]
- M. J. Murdock Charitable Trust
- Oregon Nanoscience and Microtechnologies Institute
- Oregon BEST
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This study investigates the role of catalytically active sub-surface layers in electrocatalytic reactions by controlling the atomic-scale thickness of LSMO films and heterostructures. The thickness dependence of activity towards the oxygen evolution reaction varies in LSMO films and LSMO/SrRuO3 heterostructures. This research provides new insights for designing efficient electrocatalytic nanomaterials and core-shell architectures.
Electrocatalytic reactions are known to take place at the catalyst/electrolyte interface. Whereas recent studies of size-dependent activity in nanoparticles and thickness-dependent activity of thin films imply that the sub-surface layers of a catalyst can contribute to the catalytic activity as well, most of these studies consider actual modification of the surfaces. In this study, the role of catalytically active sub-surface layers was investigated by employing atomic-scale thickness control of the La0.7Sr0.3MnO3 (LSMO) films and heterostructures, without altering the catalyst/electrolyte interface. The activity toward the oxygen evolution reaction (OER) shows a non-monotonic thickness dependence in the LSMO films and a continuous screening effect in LSMO/SrRuO3 heterostructures. The observation leads to the definition of an electrochemically-relevant depth on the order of 10 unit cells. This study on the electrocatalytic activity of epitaxial heterostructures provides new insight in designing efficient electrocatalytic nanomaterials and core-shell architectures.
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