Powdered MnySb1–yOx Catalysts for Cerium-Mediated Oxygen Evolution in Acidic Environments
Source abstract
Abstract
Mn_(y)Sb_(1-y)O_(x) powders with a series of compositions were evaluated as catalysts for chemical water oxidation in aqueous perchloric, sulfuric, or methanesulfonic acid. O₂(g) evolved spontaneously over Mn_(y)Sb_(1-y)O_(x) catalyst powders that had been suspended in solutions that were pre-loaded with Ce⁴⁺ ions. The rate of O₂ evolution depended on the amount, as well as the oxidation state, of the Mn in the powder. The highest O₂ evolution rate was observed from the most Mn-rich catalyst, which had an effective surface oxidation state of Mn²⋅⁹⁺ in its rest state. The facile synthetic accessibility of such catalysts in powder form constitutes a step toward replacing Ir or Ru in Ce-mediated oxygen evolution in decoupled water splitting systems, as well as toward developing inks of earth-abundant catalysts for preparation of catalyst-coated membranes used in conventional proton-exchange membrane electrolyzers.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Fuel Cells and Related Materials · Advanced battery technologies research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
Beckman Institute Molecular Materials Resource Center, California Institute of Technology, Pasadena, California 91125, United States
Funding
Basic Energy Sciences · Office of Science
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