[{"doi":"10.1002/cctc.202501104","article_number":"e01104","main_file_link":[{"open_access":"1"}],"language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2026-01-20T19:36:51Z","intvolume":"        18","title":"Interfacial Softening and Electrolyte Uptake in Co<sub>3</sub>O<sub>4</sub> OER Catalysts: Insight from <i>Operando</i> Spectroscopy and Fast EQCM‐D","year":"2026","publication_identifier":{"issn":["1867-3880","1867-3899"]},"author":[{"full_name":"Leppin, Christian","first_name":"Christian","last_name":"Leppin","id":"117722"},{"last_name":"Placke‐Yan","first_name":"Carsten","full_name":"Placke‐Yan, Carsten"},{"first_name":"Georg","last_name":"Bendt","full_name":"Bendt, Georg"},{"full_name":"Hernandez, Sheila","last_name":"Hernandez","first_name":"Sheila"},{"first_name":"Kristina","last_name":"Tschulik","full_name":"Tschulik, Kristina"},{"full_name":"Schulz, Stephan","last_name":"Schulz","first_name":"Stephan"},{"id":"116779","full_name":"Linnemann, Julia","last_name":"Linnemann","first_name":"Julia","orcid":"0000-0001-6883-5424"}],"type":"journal_article","keyword":["electrocatalysis","Co3O4","EQCM-D","OER"],"department":[{"_id":"985"}],"date_created":"2026-01-20T19:33:40Z","abstract":[{"lang":"eng","text":"Cobalt spinel (Co3O4) catalysts are widely studied in scope of the electrocatalytic oxygen evolution reaction (OER), yet the role of interfacial structural transformation under anodic bias remains under debate. Here, we employ an operando approach, combining a fast electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D), electrochemical impedance spectroscopy (EIS), and Raman spectroscopy to investigate interfacial transformations of Co3O4 nanoparticle electrodes in alkaline electrolyte. We identify two distinct regimes during the anodic sweep prior to the macroscopic OER onset. At lower potentials, the catalyst interface remains mechanically rigid while reversibly associating several OH−/H2O species per oxidized cobalt site. At higher potentials, pronounced softening of the interface occurs alongside further uptake of electrolyte species. This indicates amorphization and a ‘swelling process’ beyond simple adsorption. Notably, an electrochemical conditioning treatment can suppress mass and compliance hysteresis without affecting OER activity, suggesting that most incorporated electrolyte species do not participate in the OER. EIS further reveals that OER intermediates form well below the apparent OER onset potential. These results advance our mechanistic understanding of interfacial transformations in cobalt-based OER catalysts and establish EQCM-D as a sensitive operando technique for probing electrocatalyst transformations."}],"issue":"2","publication":"ChemCatChem","user_id":"116779","volume":18,"publisher":"Wiley","_id":"63675","status":"public","oa":"1","quality_controlled":"1","citation":{"mla":"Leppin, Christian, et al. “Interfacial Softening and Electrolyte Uptake in Co<sub>3</sub>O<sub>4</sub> OER Catalysts: Insight from <i>Operando</i> Spectroscopy and Fast EQCM‐D.” <i>ChemCatChem</i>, vol. 18, no. 2, e01104, Wiley, 2026, doi:<a href=\"https://doi.org/10.1002/cctc.202501104\">10.1002/cctc.202501104</a>.","ama":"Leppin C, Placke‐Yan C, Bendt G, et al. Interfacial Softening and Electrolyte Uptake in Co<sub>3</sub>O<sub>4</sub> OER Catalysts: Insight from <i>Operando</i> Spectroscopy and Fast EQCM‐D. <i>ChemCatChem</i>. 2026;18(2). doi:<a href=\"https://doi.org/10.1002/cctc.202501104\">10.1002/cctc.202501104</a>","bibtex":"@article{Leppin_Placke‐Yan_Bendt_Hernandez_Tschulik_Schulz_Linnemann_2026, title={Interfacial Softening and Electrolyte Uptake in Co<sub>3</sub>O<sub>4</sub> OER Catalysts: Insight from <i>Operando</i> Spectroscopy and Fast EQCM‐D}, volume={18}, DOI={<a href=\"https://doi.org/10.1002/cctc.202501104\">10.1002/cctc.202501104</a>}, number={2e01104}, journal={ChemCatChem}, publisher={Wiley}, author={Leppin, Christian and Placke‐Yan, Carsten and Bendt, Georg and Hernandez, Sheila and Tschulik, Kristina and Schulz, Stephan and Linnemann, Julia}, year={2026} }","apa":"Leppin, C., Placke‐Yan, C., Bendt, G., Hernandez, S., Tschulik, K., Schulz, S., &#38; Linnemann, J. (2026). Interfacial Softening and Electrolyte Uptake in Co<sub>3</sub>O<sub>4</sub> OER Catalysts: Insight from <i>Operando</i> Spectroscopy and Fast EQCM‐D. <i>ChemCatChem</i>, <i>18</i>(2), Article e01104. <a href=\"https://doi.org/10.1002/cctc.202501104\">https://doi.org/10.1002/cctc.202501104</a>","ieee":"C. Leppin <i>et al.</i>, “Interfacial Softening and Electrolyte Uptake in Co<sub>3</sub>O<sub>4</sub> OER Catalysts: Insight from <i>Operando</i> Spectroscopy and Fast EQCM‐D,” <i>ChemCatChem</i>, vol. 18, no. 2, Art. no. e01104, 2026, doi: <a href=\"https://doi.org/10.1002/cctc.202501104\">10.1002/cctc.202501104</a>.","short":"C. Leppin, C. Placke‐Yan, G. Bendt, S. Hernandez, K. Tschulik, S. Schulz, J. Linnemann, ChemCatChem 18 (2026).","chicago":"Leppin, Christian, Carsten Placke‐Yan, Georg Bendt, Sheila Hernandez, Kristina Tschulik, Stephan Schulz, and Julia Linnemann. “Interfacial Softening and Electrolyte Uptake in Co<sub>3</sub>O<sub>4</sub> OER Catalysts: Insight from <i>Operando</i> Spectroscopy and Fast EQCM‐D.” <i>ChemCatChem</i> 18, no. 2 (2026). <a href=\"https://doi.org/10.1002/cctc.202501104\">https://doi.org/10.1002/cctc.202501104</a>."}},{"page":"379-394","_id":"36538","user_id":"90339","ddc":["300"],"status":"public","has_accepted_license":"1","oa":"1","file_date_updated":"2023-01-13T09:11:05Z","citation":{"bibtex":"@article{Hiebl_Steinhardt_Bigos_2022, title={Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien in der Soziologie}, DOI={<a href=\"https://doi.org/10.3278/HSL2227W\">10.3278/HSL2227W</a>}, number={8}, journal={die hochschule}, author={Hiebl, Johannes and Steinhardt, Isabel and Bigos, Michael}, year={2022}, pages={379–394} }","ama":"Hiebl J, Steinhardt I, Bigos M. Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien in der Soziologie. <i>die hochschule</i>. 2022;(8):379-394. doi:<a href=\"https://doi.org/10.3278/HSL2227W\">10.3278/HSL2227W</a>","mla":"Hiebl, Johannes, et al. “Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien in der Soziologie.” <i>die hochschule</i>, no. 8, 2022, pp. 379–94, doi:<a href=\"https://doi.org/10.3278/HSL2227W\">10.3278/HSL2227W</a>.","short":"J. Hiebl, I. Steinhardt, M. Bigos, die hochschule (2022) 379–394.","chicago":"Hiebl, Johannes, Isabel Steinhardt, and Michael Bigos. “Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien in der Soziologie.” <i>die hochschule</i>, no. 8 (2022): 379–94. <a href=\"https://doi.org/10.3278/HSL2227W\">https://doi.org/10.3278/HSL2227W</a>.","ieee":"J. Hiebl, I. Steinhardt, and M. Bigos, “Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien in der Soziologie,” <i>die hochschule</i>, no. 8, pp. 379–394, 2022, doi: <a href=\"https://doi.org/10.3278/HSL2227W\">10.3278/HSL2227W</a>.","apa":"Hiebl, J., Steinhardt, I., &#38; Bigos, M. (2022). Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien in der Soziologie. <i>die hochschule</i>, <i>8</i>, 379–394. <a href=\"https://doi.org/10.3278/HSL2227W\">https://doi.org/10.3278/HSL2227W</a>"},"quality_controlled":"1","main_file_link":[{"url":"https://www.wbv.de/shop/Die-Un-Sichtbarkeit-von-offenen-Bildungsmaterialien-in-der-Soziologie-HSL2227W","open_access":"1"}],"language":[{"iso":"ger"}],"doi":"10.3278/HSL2227W","title":"Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien in der Soziologie","year":"2022","author":[{"first_name":"Johannes","last_name":"Hiebl","full_name":"Hiebl, Johannes"},{"first_name":"Isabel","orcid":"https://orcid.org/0000-0002-2590-6189","last_name":"Steinhardt","full_name":"Steinhardt, Isabel","id":"90339"},{"full_name":"Bigos, Michael","first_name":"Michael","last_name":"Bigos"}],"publication_identifier":{"issn":["2199-8825"]},"publication_status":"published","date_updated":"2023-01-13T09:22:13Z","article_type":"original","file":[{"file_name":"2022 Hiebl et al. Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien.pdf","access_level":"closed","file_size":608633,"relation":"main_file","date_updated":"2023-01-13T09:11:05Z","file_id":"36541","success":1,"content_type":"application/pdf","creator":"isste","date_created":"2023-01-13T09:11:05Z"}],"date_created":"2023-01-13T09:13:55Z","keyword":["Soziologie","Praxistheorie","Repositorien","Open Educational Resources","OER"],"type":"journal_article","department":[{"_id":"121"}],"publication":"die hochschule","issue":"8","abstract":[{"lang":"ger","text":"Der Beitrag beschäftigt sich mit dem Gebrauch von sogenannten Open Educational Resources (OER) innerhalb der deutschsprachigen Soziologie. OER sind Lehr-und Lernmaterialien, die öffent-lich und frei von Kosten zugänglich sind sowie unter einer offenen Lizenz stehen, die es erlaubt, das Material frei zu nutzen, zu vervielfältigen und zu bearbeiten. Um diese Form der Bereitstellung von Lehr-und Lernmaterial zu fördern, sind im deutschen Sprachraum in den letzten Jahren verschie-dene digitale Infrastrukturen entstanden, die an einzelnen Hochschulstandorten, aber auch hochschulübergreifend Lehrenden zur Verfügung stehen, um dort ihr Material zu veröffentlichen. Es wurden 37 dieser Repositorien untersucht. Darüber hinaus wurde auch die Videoplattform YouTube nach soziologischem Lehr-und Lernmaterial durchforstet. Der Beitrag stellt den Zeitverlauf und die Akteur:innen der OER-Veröffentlichungen dar. Anschließend soll mithilfe eines praxistheoretischen Vokabulars die Lehre innerhalb der Soziologie aufgeschlüsselt und ein möglicher Bezug zu den empirischen Ergebnissen hergestellt werden."}]}]