In Situ Analysis of Manganese Antimonate Oxygen Evolution Electrocatalysts via Ambient Pressure X-ray Photoelectron Spectroscopy
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).
Fields of Study & Subjects
Electrocatalysts for Energy Conversion
Ammonia Synthesis and Nitrogen Reduction
CO2 Reduction Techniques and Catalysts
Publication details
- Journal / source
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Volume
- 18
- Issue
- 9
- Pages
- 13826–13833
- Publication date
- 24 February 2026
- Language
- EN