Contribution of the Sub-Surface to Electrocatalytic Activity in Atomically Precise La 0.7 Sr 0.3 MnO 3 Heterostructures.

Autor: Lee J; Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea., Adiga P; School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR, 97331, USA., Lee SA; Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea.; Department of Physics, Pukyong National University, Busan, 48513, Republic of Korea., Nam SH; Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea., Ju HA; Department of Energy Science, Sungkyunkwan University, Suwon, 16419, Republic of Korea., Jung MH; Department of Energy Science, Sungkyunkwan University, Suwon, 16419, Republic of Korea., Jeong HY; Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea., Kim YM; Department of Energy Science, Sungkyunkwan University, Suwon, 16419, Republic of Korea., Wong C; School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR, 97331, USA., Elzein R; School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR, 97331, USA., Addou R; School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR, 97331, USA., Stoerzinger KA; School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR, 97331, USA.; Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99254, USA., Choi WS; Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2021 Dec; Vol. 17 (49), pp. e2103632. Date of Electronic Publication: 2021 Oct 22.
DOI: 10.1002/smll.202103632
Abstrakt: 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 La 0.7 Sr 0.3 MnO 3 (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/SrRuO 3 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.
(© 2021 Wiley-VCH GmbH.)
Databáze: MEDLINE
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