[{"publication":"Bunsen-Magazin","issue":"4","abstract":[{"lang":"eng","text":"Alkaline oxygen evolution on Co3O4 involves more than adsorption and electron transfer at a fixed surface. The article draws on operando electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D), surface X-ray diffraction (SXRD), Raman, UV/Vis and impedance spectroscopy. On this basis, it discusses pseudocapacitive oxidation of cobalt ion sites, electrolyte uptake and near-surface transformation, and asks which of these changes are kinetically coupled to electrocatalysis."}],"date_created":"2026-07-14T14:59:31Z","department":[{"_id":"985"}],"type":"journal_article","keyword":["electrocatalysis","oxygen evolution reaction","cobalt spinel","operando characterization","spectroelectrochemistry"],"author":[{"id":"116779","last_name":"Linnemann","first_name":"Julia","orcid":"0000-0001-6883-5424","full_name":"Linnemann, Julia"},{"last_name":"Leppin","first_name":"Christian","full_name":"Leppin, Christian","id":"117722"}],"year":"2026","title":"The catalyst that stores charge first","article_type":"review","date_updated":"2026-07-14T15:02:05Z","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://bunsen.de/bmo/the-catalyst-that-stores-charge-first","open_access":"1"}],"doi":"10.26125/6G4P-8386","citation":{"bibtex":"@article{Linnemann_Leppin_2026, title={The catalyst that stores charge first}, DOI={<a href=\"https://doi.org/10.26125/6G4P-8386\">10.26125/6G4P-8386</a>}, number={4}, journal={Bunsen-Magazin}, publisher={Deutsche Bunsen-Gesellschaft für physikalische Chemie e.V.}, author={Linnemann, Julia and Leppin, Christian}, year={2026}, pages={81–84} }","ama":"Linnemann J, Leppin C. The catalyst that stores charge first. <i>Bunsen-Magazin</i>. 2026;(4):81-84. doi:<a href=\"https://doi.org/10.26125/6G4P-8386\">10.26125/6G4P-8386</a>","mla":"Linnemann, Julia, and Christian Leppin. “The Catalyst That Stores Charge First.” <i>Bunsen-Magazin</i>, no. 4, Deutsche Bunsen-Gesellschaft für physikalische Chemie e.V., 2026, pp. 81–84, doi:<a href=\"https://doi.org/10.26125/6G4P-8386\">10.26125/6G4P-8386</a>.","short":"J. Linnemann, C. Leppin, Bunsen-Magazin (2026) 81–84.","chicago":"Linnemann, Julia, and Christian Leppin. “The Catalyst That Stores Charge First.” <i>Bunsen-Magazin</i>, no. 4 (2026): 81–84. <a href=\"https://doi.org/10.26125/6G4P-8386\">https://doi.org/10.26125/6G4P-8386</a>.","ieee":"J. Linnemann and C. Leppin, “The catalyst that stores charge first,” <i>Bunsen-Magazin</i>, no. 4, pp. 81–84, 2026, doi: <a href=\"https://doi.org/10.26125/6G4P-8386\">10.26125/6G4P-8386</a>.","apa":"Linnemann, J., &#38; Leppin, C. (2026). The catalyst that stores charge first. <i>Bunsen-Magazin</i>, <i>4</i>, 81–84. <a href=\"https://doi.org/10.26125/6G4P-8386\">https://doi.org/10.26125/6G4P-8386</a>"},"popular_science":"1","oa":"1","conference":{"end_date":"2026-04-01","location":"Dresden","name":"Bunsen Conference 2026","start_date":"2026-03-30"},"status":"public","publisher":"Deutsche Bunsen-Gesellschaft für physikalische Chemie e.V.","_id":"66488","page":"81-84","user_id":"116779"},{"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"}],"publication":"ACS Catalysis","issue":"21","department":[{"_id":"985"}],"keyword":["electrocatalysis","oxygen evolution reaction","cobalt spinel","operando characterization","spectroelectrochemistry"],"type":"journal_article","date_created":"2025-10-24T07:49:21Z","article_type":"original","intvolume":"        15","publication_status":"published","date_updated":"2025-12-07T17:15:53Z","publication_identifier":{"issn":["2155-5435","2155-5435"]},"author":[{"first_name":"L.","last_name":"Kampermann","full_name":"Kampermann, L."},{"first_name":"J.","last_name":"Klein","full_name":"Klein, J."},{"full_name":"Wagner, T.","first_name":"T.","last_name":"Wagner"},{"first_name":"A.","last_name":"Kotova","full_name":"Kotova, A."},{"last_name":"Placke-Yan","first_name":"C.","full_name":"Placke-Yan, C."},{"full_name":"Yasar, A.","first_name":"A.","last_name":"Yasar"},{"full_name":"Jacobse, L.","last_name":"Jacobse","first_name":"L."},{"first_name":"S.","last_name":"Lasagna","full_name":"Lasagna, S."},{"full_name":"Leppin, Christian","last_name":"Leppin","first_name":"Christian","id":"117722"},{"first_name":"S.","last_name":"Schulz","full_name":"Schulz, S."},{"first_name":"Julia","last_name":"Linnemann","orcid":"0000-0001-6883-5424","full_name":"Linnemann, Julia","id":"116779"},{"first_name":"A.","last_name":"Bergmann","full_name":"Bergmann, A."},{"full_name":"Roldan Cuenya, B.","first_name":"B.","last_name":"Roldan Cuenya"},{"full_name":"Bacher, G.","last_name":"Bacher","first_name":"G."}],"year":"2025","title":"Operando Analysis of the Pre-OER Activation of Metal-Doped Co<sub>3</sub>O<sub>4</sub> Nanoparticle Catalysts","doi":"10.1021/acscatal.5c03900","language":[{"iso":"eng"}],"quality_controlled":"1","citation":{"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>.","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>","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>.","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>","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} }","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>."},"status":"public","volume":15,"user_id":"116779","_id":"61982","publisher":"American Chemical Society (ACS)","page":"18391-18403"}]