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Title: Influence of LaFeO3 Surface Termination on Water Reactivity

Abstract

© 2017 American Chemical Society. The polarity of oxide surfaces can dramatically impact their surface reactivity, in particular, with polar molecules such as water. The surface species that result from this interaction change the oxide electronic structure and chemical reactivity in applications such as photoelectrochemistry but are challenging to probe experimentally. Here, we report a detailed study of the surface chemistry and electronic structure of the perovskite LaFeO 3 in humid conditions using ambient-pressure X-ray photoelectron spectroscopy. Comparing the two possible terminations of the polar (001)-oriented surface, we find that the LaO-terminated surface is more reactive toward water, forming hydroxyl species and adsorbing molecular water at lower relative humidity than its FeO 2 -terminated counterpart. However, the FeO 2 -terminated surface forms more hydroxyl species during water adsorption at higher humidity, suggesting that adsorbate-adsorbate interactions may impact reactivity. Our results demonstrate how the termination of a complex oxide can dramatically impact its reactivity, providing insight that can aid in the design of catalyst materials.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1];  [3]; ORCiD logo [4];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical and Computational Sciences Directorate
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical and Computational Sciences Directorate; Auburn Univ., AL (United States). Dept. of Physics
  3. Pohang Accelerator Lab. (PAL) (Korea, Republic of)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1343949
Alternate Identifier(s):
OSTI ID: 1379758
Report Number(s):
PNNL-SA-123478
Journal ID: ISSN 1948-7185
Grant/Contract Number:  
AC0576RL01830; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Stoerzinger, Kelsey A., Comes, Ryan, Spurgeon, Steven R., Thevuthasan, Suntharampillai, Ihm, Kyuwook, Crumlin, Ethan J., and Chambers, Scott A. Influence of LaFeO3 Surface Termination on Water Reactivity. United States: N. p., 2017. Web. doi:10.1021/acs.jpclett.7b00195.
Stoerzinger, Kelsey A., Comes, Ryan, Spurgeon, Steven R., Thevuthasan, Suntharampillai, Ihm, Kyuwook, Crumlin, Ethan J., & Chambers, Scott A. Influence of LaFeO3 Surface Termination on Water Reactivity. United States. https://doi.org/10.1021/acs.jpclett.7b00195
Stoerzinger, Kelsey A., Comes, Ryan, Spurgeon, Steven R., Thevuthasan, Suntharampillai, Ihm, Kyuwook, Crumlin, Ethan J., and Chambers, Scott A. Thu . "Influence of LaFeO3 Surface Termination on Water Reactivity". United States. https://doi.org/10.1021/acs.jpclett.7b00195. https://www.osti.gov/servlets/purl/1343949.
@article{osti_1343949,
title = {Influence of LaFeO3 Surface Termination on Water Reactivity},
author = {Stoerzinger, Kelsey A. and Comes, Ryan and Spurgeon, Steven R. and Thevuthasan, Suntharampillai and Ihm, Kyuwook and Crumlin, Ethan J. and Chambers, Scott A.},
abstractNote = {© 2017 American Chemical Society. The polarity of oxide surfaces can dramatically impact their surface reactivity, in particular, with polar molecules such as water. The surface species that result from this interaction change the oxide electronic structure and chemical reactivity in applications such as photoelectrochemistry but are challenging to probe experimentally. Here, we report a detailed study of the surface chemistry and electronic structure of the perovskite LaFeO 3 in humid conditions using ambient-pressure X-ray photoelectron spectroscopy. Comparing the two possible terminations of the polar (001)-oriented surface, we find that the LaO-terminated surface is more reactive toward water, forming hydroxyl species and adsorbing molecular water at lower relative humidity than its FeO 2 -terminated counterpart. However, the FeO 2 -terminated surface forms more hydroxyl species during water adsorption at higher humidity, suggesting that adsorbate-adsorbate interactions may impact reactivity. Our results demonstrate how the termination of a complex oxide can dramatically impact its reactivity, providing insight that can aid in the design of catalyst materials.},
doi = {10.1021/acs.jpclett.7b00195},
journal = {Journal of Physical Chemistry Letters},
number = 5,
volume = 8,
place = {United States},
year = {Thu Feb 16 00:00:00 EST 2017},
month = {Thu Feb 16 00:00:00 EST 2017}
}

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