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PreprintCC BYChemRxiv

TiO2 as active site and protective layer on Sn doped spinel cobalt oxide for acidic OER

  • András Kozák1
  • Georgios K. Stavroglou1
  • Julie B. Koefoed1
  • Albin Mustafi1
  • Gustav Stausbøll Hedemark1
  • Charalampos Lampadaris2,3
  • Henrik H. Kristoffersen1
  • Jan Rossmeisl1
  • Soren B. Scott1
  1. 1Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen, Denmark, 2100
  2. 2Niels Bohr Institute
  3. 3University of Copenhagen
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Abstract

Green hydrogen is expected to play a major role in the decarbonisation of hard-to-electrify sectors such as shipping, aviation, steel, and fertiliser. Cost effective acidic water electrolysis to produce green hydrogen requires active, stable non-noble metal oxide catalysts, however non-noble metal oxides tend to be unstable at oxidative potentials in acidic media. In this work we show that Sn doped Co 3 O 4 exhibits improved activity, while using an ultrathin TiO 2 overlayer improves stability greatly without hindering activity. The maximal activity, at 5% Sn content, was comparable to the state-of-the-art for non-noble PEM anode catalysts, while the maximal stabilising effect produced by the overlayer was more than eightfold.

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Cite

BibTeXRIS
BibTeX
@misc{kozak2026tio2,
  title = {{TiO2 as active site and protective layer on Sn doped spinel cobalt oxide for acidic OER}},
  author = {András Kozák and Georgios K. Stavroglou and Julie B. Koefoed and Albin Mustafi and Gustav Stausbøll Hedemark and Charalampos Lampadaris and Henrik H. Kristoffersen and Jan Rossmeisl and Soren B. Scott},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15009984/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009984/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - TiO2 as active site and protective layer on Sn doped spinel cobalt oxide for acidic OER
AU  - András Kozák
AU  - Georgios K. Stavroglou
AU  - Julie B. Koefoed
AU  - Albin Mustafi
AU  - Gustav Stausbøll Hedemark
AU  - Charalampos Lampadaris
AU  - Henrik H. Kristoffersen
AU  - Jan Rossmeisl
AU  - Soren B. Scott
PY  - 2026
DA  - 2026/10/06
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15009984/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009984/v1
AB  - Green hydrogen is expected to play a major role in the decarbonisation of hard-to-electrify sectors such as shipping, aviation, steel, and fertiliser. Cost effective acidic water electrolysis to produce green hydrogen requires active, stable non-noble metal oxide catalysts, however non-noble metal oxides tend to be unstable at oxidative potentials in acidic media. In this work we show that Sn doped Co 3 O 4 exhibits improved activity, while using an ultrathin TiO 2 overlayer improves stability greatly without hindering activity. The maximal activity, at 5% Sn content, was comparable to the state-of-the-art for non-noble PEM anode catalysts, while the maximal stabilising effect produced by the overlayer was more than eightfold.
ER  -