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PreprintCC BYChemRxiv

Hydrogen Pretreatment Programs Oxidative Surface Reconstruction for Enhanced Lattice-Oxygen Reactivity in Co3O4

  • Silvio Bellomi1,2
  • Jonathan Rollenitz3
  • Christoph Rameshan3
  • Daniel C. Cano-Blanco4,5,6,7
  • Christian M. Pichler8
  • Prathamesh Patil8
  • Pongtanawat Khemthong9
  • Panot Krukkratoke9
  • Jakkapop Phanthasri9
  • Sirinuch Loiha10,11
  • Jakob Peer12
  • Alexander K. Opitz12
1 more authors
  • Karin Föttinger1,2
12 affiliations
  1. 1Institute of Materials Chemistry
  2. 2Technische Universität Wien Getreidemarkt
  3. 3Chair of Physical Chemistry Montanuniversity Leoben
  4. 4Institute of Chemical and Bioengineering
  5. 5École polytechnique fédérale de Lausanne
  6. 6PSI Center for Energy and Environmental Sciences
  7. 7Paul Scherrer Institute
  8. 8Institute for Applied Physics, Technische Universität Wien, Wiedner Hauptstraße 8, Vienna, Austria, 1040
  9. 9National Nanotechnology Center (NANOTEC, Development Agency (NSTDA, Phahonyothin Rd, Klong Nueng, Pathum Thani, Thailand
  10. 10Department of Chemistry, Faculty of Science
  11. 11Khon Kaen University (KKU
  12. 12Institute of Chemical Technologies and Analytics, Technische Universität Wien, Getreidemarkt 9/164, Vienna, Austria, 1060
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Abstract

The oxidation activity of reducible oxides is closely linked to the nature of lattice oxygen species, and reductive treatments are often used to tailor the low-temperature reactivity by modifying the surface coordination environment. Here, using Co3O4 and the oxidation of 2-propanol as a model reaction, we demonstrate that a further enhancement of the low-temperature activity can be achieved by extending the reduction beyond conventional surface modification to access distinct, metastable CoO surface terminations. These terminations spontaneously reconstruct under oxidizing conditions into oxygen-rich surface structures that exhibit enhanced lattice oxygen reactivity and are key to the improved lowtemperature activity. This work establishes programmed surface reconstruction through a defined reduction-oxidation sequence as a strategy for engineering highly reactive lattice oxygen sites in reducible oxides.

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Cite

BibTeXRIS
BibTeX
@misc{bellomi2026hydrogen,
  title = {{Hydrogen Pretreatment Programs Oxidative Surface Reconstruction for Enhanced Lattice-Oxygen Reactivity in Co3O4}},
  author = {Silvio Bellomi and Jonathan Rollenitz and Christoph Rameshan and Daniel C. Cano-Blanco and Christian M. Pichler and Prathamesh Patil and Pongtanawat Khemthong and Panot Krukkratoke and Jakkapop Phanthasri and Sirinuch Loiha and Jakob Peer and Alexander K. Opitz and Karin Föttinger},
  howpublished = {ChemRxiv},
  year = {2026},
  month = sep,
  doi = {10.26434/chemrxiv.15008390/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008390/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Hydrogen Pretreatment Programs Oxidative Surface Reconstruction for Enhanced Lattice-Oxygen Reactivity in Co3O4
AU  - Silvio Bellomi
AU  - Jonathan Rollenitz
AU  - Christoph Rameshan
AU  - Daniel C. Cano-Blanco
AU  - Christian M. Pichler
AU  - Prathamesh Patil
AU  - Pongtanawat Khemthong
AU  - Panot Krukkratoke
AU  - Jakkapop Phanthasri
AU  - Sirinuch Loiha
AU  - Jakob Peer
AU  - Alexander K. Opitz
AU  - Karin Föttinger
PY  - 2026
DA  - 2026/09/07
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15008390/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008390/v1
AB  - The oxidation activity of reducible oxides is closely linked to the nature of lattice oxygen species, and reductive treatments are often used to tailor the low-temperature reactivity by modifying the surface coordination environment. Here, using Co3O4 and the oxidation of 2-propanol as a model reaction, we demonstrate that a further enhancement of the low-temperature activity can be achieved by extending the reduction beyond conventional surface modification to access distinct, metastable CoO surface terminations. These terminations spontaneously reconstruct under oxidizing conditions into oxygen-rich surface structures that exhibit enhanced lattice oxygen reactivity and are key to the improved lowtemperature activity. This work establishes programmed surface reconstruction through a defined reduction-oxidation sequence as a strategy for engineering highly reactive lattice oxygen sites in reducible oxides.
ER  -