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Updated: Feb 26, 2026
Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
In Situ Analysis of Manganese Antimonate Oxygen Evolution Electrocatalysts via Ambient Pressure X-ray Photoelectron
Jake Evans1, Zachary Ifkovits1, Maureen Morla1
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.
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).
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