Journal article
In Situ Analysis of Manganese Antimonate Oxygen Evolution Electrocatalysts via Ambient Pressure X-ray Photoelectron Spectroscopy
ACS applied materials & interfaces
02/24/2026
DOI: 10.1021/acsami.5c23862
PMID: 41733173
Abstract
Manganese antimonates are earth-abundant potential alternatives to precious metal catalysts for the oxygen-evolution reaction (OER). Herein, X-ray photoelectron spectroscopy was used to determine the surface chemistry of a manganese antimonate catalyst for the OER under ultrahigh vacuum, ambient pressure, and in situ reaction conditions. Ex situ and in situ analyses revealed the oxidation states of surficial species as a function of material stoichiometry, water content, and applied potential. In situ XPS measurements in 1.0 M KOH(aq) indicated that relative to the rest state, the surface Mn(III) partially oxidized while effecting the OER, with approximately 15% of the Mn signal attributable to Mn(IV) and the remainder attributable to Mn(III).
Details
- Title: Subtitle
- In Situ Analysis of Manganese Antimonate Oxygen Evolution Electrocatalysts via Ambient Pressure X-ray Photoelectron Spectroscopy
- Creators
- Jake Evans - California Institute of TechnologyZachary Ifkovits - California Institute of TechnologyMaureen Morla - California Institute of TechnologyJacqueline Dowling - California Institute of TechnologyAzhar Carim - California Institute of TechnologyNathan Lewis - California Institute of Technology
- Resource Type
- Journal article
- Publication Details
- ACS applied materials & interfaces
- DOI
- 10.1021/acsami.5c23862
- PMID
- 41733173
- NLM abbreviation
- ACS Appl Mater Interfaces
- ISSN
- 1944-8244
- eISSN
- 1944-8252
- Publisher
- American Chemical Society
- Grant note
- Basic Energy Sciences: DE-FG02-03-ER15483 Office of Science: DE-AC02-05CH11231
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DE-FG02-03-ER15483. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231, utilizing Endstation 9.3.1.1 Tender X-ray AP-XPS. The authors graciously acknowledge Rebecca Hamlyn, Haoyi Li, Oliver Quinn Carvalho, and especially Ethan Crumlin for their assistance and advice during data collection at the Advanced Light Source. Research was in part carried out at the Molecular Materials Research Center in the Beckman Institute of the California Institute of Technology.
- Language
- English
- Electronic publication date
- 02/24/2026
- Academic Unit
- Civil and Environmental Engineering
- Record Identifier
- 9985141998402771
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