2026-07-06T05:27:54Z https://archive.materialscloud.org/oai2d

oai:materialscloud.org:163wg-cn029 2025-12-05T14:17:30Z community-mcarchive openaire_data

Huang, Jinzhen Fabbri, Emiliana Huang, Jinzhen Schmidt, J. Thomas Fabbri, Emiliana 2025-12-05 <p><span>Cobalt-based oxides have been investigated as potential alternatives to Ir/Ru-based oxides for catalyzing the oxygen evolution reaction (OER) in acidic media. Past research, however,</span><span> is mainly focused on the spinel oxide structure so far. Exploring alternative crystal structures is essential for expanding the material library and developing highly efficient OER catalysts for acidic environments. As a proof of concept, we demonstrate that Co-based perovskite oxides can drive acidic OER effectively. Appling hard/soft X-ray absorption spectroscopy (hXAS/sXAS) characterizations, we show that the La and Ce doped SrCoO<sub>3</sub> (denoted as LSC and CSC, respectively) have a bulk-average Co oxidation state close to 3+ and surface-dominant low-spin Co<sup>III</sup> species. Electrochemical analysis reveals that they only show one Co redox pair, similar to CoOOH in acidic environments. The recorded Tafel slopes are around ~65 mV dec<sup>-1</sup>, comparable to the benchmarking Ir/Ru-based catalysts. The combination of the spectroscopic and electrochemical findings presented here highlights the important role of low-spin Co<sup>III</sup> species in catalyzing OER in acidic environments and contributes to the rational design of non-noble metal OER catalysts.</span></p> text/markdown application/vnd.openxmlformats-officedocument.spreadsheetml.sheet https://doi.org/10.24435/materialscloud:by-dm oai:materialscloud.org:163wg-cn029 mcid:2025.189 eng Materials Cloud https://archive.materialscloud.org/communities/mcarchive https://doi.org/10.24435/materialscloud:rg-am info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode Perovskite oxides acidic oxygen evolution reaction X-ray adsorption spectroscopy cobalt oxidation state cobalt-based catalysts Experimental Cobalt-based perovskite oxides as catalysts for acidic oxygen evolution reaction info:eu-repo/semantics/other