In Situ Analysis of Manganese Antimonate Oxygen Evolution Electrocatalysts via Ambient Pressure X-ray Photoelectron Spectroscopy
Source abstract
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).
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Ammonia Synthesis and Nitrogen Reduction · CO2 Reduction Techniques and Catalysts
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Division of Chemistry and Chemical Engineering
California Institute of Technology
Beckman Institute
Funding
Basic Energy Sciences · Office of Science
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