[{"status":"public","volume":15,"user_id":"116779","publisher":"American Chemical Society (ACS)","_id":"61982","page":"18391-18403","quality_controlled":"1","citation":{"bibtex":"@article{Kampermann_Klein_Wagner_Kotova_Placke-Yan_Yasar_Jacobse_Lasagna_Leppin_Schulz_et al._2025, title={Operando Analysis of the Pre-OER Activation of Metal-Doped Co<sub>3</sub>O<sub>4</sub> Nanoparticle Catalysts}, volume={15}, DOI={<a href=\"https://doi.org/10.1021/acscatal.5c03900\">10.1021/acscatal.5c03900</a>}, number={21}, journal={ACS Catalysis}, publisher={American Chemical Society (ACS)}, author={Kampermann, L. and Klein, J. and Wagner, T. and Kotova, A. and Placke-Yan, C. and Yasar, A. and Jacobse, L. and Lasagna, S. and Leppin, Christian and Schulz, S. and et al.}, year={2025}, pages={18391–18403} }","ama":"Kampermann L, Klein J, Wagner T, et al. Operando Analysis of the Pre-OER Activation of Metal-Doped Co<sub>3</sub>O<sub>4</sub> Nanoparticle Catalysts. <i>ACS Catalysis</i>. 2025;15(21):18391-18403. doi:<a href=\"https://doi.org/10.1021/acscatal.5c03900\">10.1021/acscatal.5c03900</a>","mla":"Kampermann, L., et al. “Operando Analysis of the Pre-OER Activation of Metal-Doped Co<sub>3</sub>O<sub>4</sub> Nanoparticle Catalysts.” <i>ACS Catalysis</i>, vol. 15, no. 21, American Chemical Society (ACS), 2025, pp. 18391–403, doi:<a href=\"https://doi.org/10.1021/acscatal.5c03900\">10.1021/acscatal.5c03900</a>.","short":"L. Kampermann, J. Klein, T. Wagner, A. Kotova, C. Placke-Yan, A. Yasar, L. Jacobse, S. Lasagna, C. Leppin, S. Schulz, J. Linnemann, A. Bergmann, B. Roldan Cuenya, G. Bacher, ACS Catalysis 15 (2025) 18391–18403.","chicago":"Kampermann, L., J. Klein, T. Wagner, A. Kotova, C. Placke-Yan, A. Yasar, L. Jacobse, et al. “Operando Analysis of the Pre-OER Activation of Metal-Doped Co<sub>3</sub>O<sub>4</sub> Nanoparticle Catalysts.” <i>ACS Catalysis</i> 15, no. 21 (2025): 18391–403. <a href=\"https://doi.org/10.1021/acscatal.5c03900\">https://doi.org/10.1021/acscatal.5c03900</a>.","ieee":"L. Kampermann <i>et al.</i>, “Operando Analysis of the Pre-OER Activation of Metal-Doped Co<sub>3</sub>O<sub>4</sub> Nanoparticle Catalysts,” <i>ACS Catalysis</i>, vol. 15, no. 21, pp. 18391–18403, 2025, doi: <a href=\"https://doi.org/10.1021/acscatal.5c03900\">10.1021/acscatal.5c03900</a>.","apa":"Kampermann, L., Klein, J., Wagner, T., Kotova, A., Placke-Yan, C., Yasar, A., Jacobse, L., Lasagna, S., Leppin, C., Schulz, S., Linnemann, J., Bergmann, A., Roldan Cuenya, B., &#38; Bacher, G. (2025). Operando Analysis of the Pre-OER Activation of Metal-Doped Co<sub>3</sub>O<sub>4</sub> Nanoparticle Catalysts. <i>ACS Catalysis</i>, <i>15</i>(21), 18391–18403. <a href=\"https://doi.org/10.1021/acscatal.5c03900\">https://doi.org/10.1021/acscatal.5c03900</a>"},"intvolume":"        15","article_type":"original","date_updated":"2025-12-07T17:15:53Z","publication_status":"published","author":[{"full_name":"Kampermann, L.","first_name":"L.","last_name":"Kampermann"},{"last_name":"Klein","first_name":"J.","full_name":"Klein, J."},{"full_name":"Wagner, T.","first_name":"T.","last_name":"Wagner"},{"last_name":"Kotova","first_name":"A.","full_name":"Kotova, A."},{"full_name":"Placke-Yan, C.","first_name":"C.","last_name":"Placke-Yan"},{"full_name":"Yasar, A.","last_name":"Yasar","first_name":"A."},{"full_name":"Jacobse, L.","first_name":"L.","last_name":"Jacobse"},{"first_name":"S.","last_name":"Lasagna","full_name":"Lasagna, S."},{"first_name":"Christian","last_name":"Leppin","full_name":"Leppin, Christian","id":"117722"},{"full_name":"Schulz, S.","last_name":"Schulz","first_name":"S."},{"id":"116779","full_name":"Linnemann, Julia","orcid":"0000-0001-6883-5424","first_name":"Julia","last_name":"Linnemann"},{"full_name":"Bergmann, A.","last_name":"Bergmann","first_name":"A."},{"last_name":"Roldan Cuenya","first_name":"B.","full_name":"Roldan Cuenya, B."},{"full_name":"Bacher, G.","first_name":"G.","last_name":"Bacher"}],"publication_identifier":{"issn":["2155-5435","2155-5435"]},"title":"Operando Analysis of the Pre-OER Activation of Metal-Doped Co<sub>3</sub>O<sub>4</sub> Nanoparticle Catalysts","year":"2025","doi":"10.1021/acscatal.5c03900","language":[{"iso":"eng"}],"abstract":[{"text":"Doped Co3O4 nanoparticles are investigated via spectro-electrochemistry in the (pre-) oxygen evolution reaction (OER) regime by tracing the absorption signal of the Co3+ d–d transition under applied bias for getting insight into the catalysts activation and the formation of catalytically active phases. In the low potential regime up to 1.37 VRHE, a rise in the optical absorption signal of the [Co3+]oct d–d transition is observed and attributed to a structural change from [Co2+]tet to [Co3+]oct due to an electrochemically induced surface restructuring with water. For applied potentials higher than 1.37 VRHE an overall offset of the absorption spectra in the UV–vis range, equivalent to a darkening of the materials is detected. This is attributed to the formation of a CoOx(OH)y skin layer as supported by high-energy X-ray diffraction (HE-XRD) measurements. We found that the kinetics of the Co3+ states are heavily influenced by the type of dopant with V-doped Co3O4 exhibiting stable Co3+ states (>20 min) while the Mn-doped Co3O4 Co3+ states reduce within 36 s under reductive bias. We conclude that doping Co3O4 with transition metals affects the formation and potential-dependent thickness of the CoOx(OH)y skin layer as the catalytically active phase and the formation of long-time stable surface Co3+ states after activation in the first OER cycle.","lang":"eng"}],"issue":"21","publication":"ACS Catalysis","department":[{"_id":"985"}],"keyword":["electrocatalysis","oxygen evolution reaction","cobalt spinel","operando characterization","spectroelectrochemistry"],"type":"journal_article","date_created":"2025-10-24T07:49:21Z"}]