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Journal article
Structural Evolution of Ultrathin SrFeO3−δ Films during Oxygen Evolution Reaction Revealed by In Situ Electrochemical Stress Measurements
ACS applied energy materials, v 6(23), pp 11882-11889
11 Dec 2023
PMID: 38098872
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We report the electrochemical stress analysis of SrFeO3−δ (SFO) films deposited on Au substrates during oxygen evolution reactions (OERs). Our in situ analysis of Au reveals conversion reactions from Au to Au(OH)3, AuOOH, and AuO x during the OER. Au reactions cause a monotonic compressive stress on surfaces assigned to the formation of Au hydroxides and oxides. Electrochemical stress analysis of SrFeO3−δ/Au shows a dramatically different behavior during the OER, which we attribute to structural evolutions and conversion reactions, such as the conversion of SFO to iron (oxy)hydroxides. Interestingly, electrochemical stress analysis of SrFeO3−δ/Au shows a tensile trend, which evolves with cycling history. Electrochemical stress analysis of SFO films before the onset of the OER shows in situ changes, which cause tensile stresses when cycling to 1.2 V. We attribute these stresses to the formation of Fe2+δOδ(OH)2−δ (0 ≤ δ ≤ 1.5)-type materials where δ approaches 1.5 at higher potentials. At potentials higher than 1.2 V and during OER, surface stress response is rather stable, which we assign to the full conversion of SFO to iron (oxy)hydroxides. This analysis provides insight into the reaction mechanism and details of in situ structural changes of iron perovskites during the OER in alkaline environments.
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Details
- Title
- Structural Evolution of Ultrathin SrFeO3−δ Films during Oxygen Evolution Reaction Revealed by In Situ Electrochemical Stress Measurements
- Creators
- Emily Marquez - California State University, Long BeachKim Hong Keu - California State University, Long BeachAndrea Nelson - California State University, Long BeachBenjamin M. Lefler - Drexel UniversitySteven J. May - Drexel University, Materials Science and EngineeringHadi Tavassol - California State University, Long Beach
- Publication Details
- ACS applied energy materials, v 6(23), pp 11882-11889
- Publisher
- American Chemical Society
- Number of pages
- 8
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:001123847200001
- Scopus ID
- 2-s2.0-85179157709
- Other Identifier
- 991021861181204721
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Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Materials Science, Multidisciplinary