Catalysis of the Oxygen-Evolution Reaction in 1.0 M Sulfuric Acid by Manganese Antimonate Films Synthesized via Chemical Vapor Deposition
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1.
California Institute of Technology
Abstract
Manganese antimonate (MnySb1–yOx) electrocatalysts for the oxygen-evolution reaction (OER) were synthesized via chemical vapor deposition. Mn-rich rutile Mn0.63Sb0.37Ox catalysts on fluorine-doped tin oxide (FTO) supports drove the OER for 168 h (7 days) at 10 mA cm–2 with a time-averaged overpotential of 687 ± 9 mV and with >97% Faradaic efficiency. Time-dependent anolyte composition analysis revealed the steady dissolution of Mn and Sb. Extended durability analysis confirmed that Mn-rich MnySb1–yOx materials are more active but dissolve at a faster rate than previously reported Sb-rich MnySb1–yOx alloys.
Copyright and License
© 2024 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0.
Acknowledgement
This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Science under Award Number DE-FG02-03-ER15483. ICP-MS data were collected at the Water and Environment Lab of the Resnick Sustainability Institute at the California Institute of Technology. XPS data were collected at the Molecular Materials Resource Center of the Beckman Institute at the California Institute of Technology.
Contributions
J.A.D. and Z.P.I. contributed equally.
Data Availability
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Detailed experimental procedures, materials and chemicals, sample preparation, electrochemical measurements, materials characterization, additional OER overpotential data and metal dissolution rates, scanning electron micrographs, energy-dispersive X-ray spectroscopy data, X-ray diffraction data, and X-ray photoelectron spectra (PDF)
Conflict of Interest
The authors declare the following competing financial interest(s): N.S.L. is a scientific founder of and consultant to H2U Technologies, a company developing catalysts and electrolyzers for the production of hydrogen.
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Additional details
- ISSN
- 2574-0962
- DOI
- 10.1021/acsaem.4c00135
- PMCID
- PMC11134315
- United States Department of Energy
- DE-FG02-03-ER15483
- Caltech groups
- Resnick Sustainability Institute