---
_id: '63675'
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.
article_number: e01104
author:
- first_name: Christian
full_name: Leppin, Christian
id: '117722'
last_name: Leppin
- first_name: Carsten
full_name: Placke‐Yan, Carsten
last_name: Placke‐Yan
- first_name: Georg
full_name: Bendt, Georg
last_name: Bendt
- first_name: Sheila
full_name: Hernandez, Sheila
last_name: Hernandez
- first_name: Kristina
full_name: Tschulik, Kristina
last_name: Tschulik
- first_name: Stephan
full_name: Schulz, Stephan
last_name: Schulz
- first_name: Julia
full_name: Linnemann, Julia
id: '116779'
last_name: Linnemann
orcid: 0000-0001-6883-5424
citation:
ama: 'Leppin C, Placke‐Yan C, Bendt G, et al. Interfacial Softening and Electrolyte
Uptake in Co3O4 OER Catalysts: Insight from Operando
Spectroscopy and Fast EQCM‐D. ChemCatChem. 2026;18(2). doi:10.1002/cctc.202501104'
apa: 'Leppin, C., Placke‐Yan, C., Bendt, G., Hernandez, S., Tschulik, K., Schulz,
S., & Linnemann, J. (2026). Interfacial Softening and Electrolyte Uptake in
Co3O4 OER Catalysts: Insight from Operando Spectroscopy
and Fast EQCM‐D. ChemCatChem, 18(2), Article e01104. https://doi.org/10.1002/cctc.202501104'
bibtex: '@article{Leppin_Placke‐Yan_Bendt_Hernandez_Tschulik_Schulz_Linnemann_2026,
title={Interfacial Softening and Electrolyte Uptake in Co3O4
OER Catalysts: Insight from Operando Spectroscopy and Fast EQCM‐D}, volume={18},
DOI={10.1002/cctc.202501104},
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} }'
chicago: 'Leppin, Christian, Carsten Placke‐Yan, Georg Bendt, Sheila Hernandez,
Kristina Tschulik, Stephan Schulz, and Julia Linnemann. “Interfacial Softening
and Electrolyte Uptake in Co3O4 OER Catalysts: Insight from
Operando Spectroscopy and Fast EQCM‐D.” ChemCatChem 18, no. 2 (2026).
https://doi.org/10.1002/cctc.202501104.'
ieee: 'C. Leppin et al., “Interfacial Softening and Electrolyte Uptake in
Co3O4 OER Catalysts: Insight from Operando Spectroscopy
and Fast EQCM‐D,” ChemCatChem, vol. 18, no. 2, Art. no. e01104, 2026, doi:
10.1002/cctc.202501104.'
mla: 'Leppin, Christian, et al. “Interfacial Softening and Electrolyte Uptake in
Co3O4 OER Catalysts: Insight from Operando Spectroscopy
and Fast EQCM‐D.” ChemCatChem, vol. 18, no. 2, e01104, Wiley, 2026, doi:10.1002/cctc.202501104.'
short: C. Leppin, C. Placke‐Yan, G. Bendt, S. Hernandez, K. Tschulik, S. Schulz,
J. Linnemann, ChemCatChem 18 (2026).
date_created: 2026-01-20T19:33:40Z
date_updated: 2026-01-20T19:36:51Z
department:
- _id: '985'
doi: 10.1002/cctc.202501104
intvolume: ' 18'
issue: '2'
keyword:
- electrocatalysis
- Co3O4
- EQCM-D
- OER
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
publication: ChemCatChem
publication_identifier:
issn:
- 1867-3880
- 1867-3899
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: 'Interfacial Softening and Electrolyte Uptake in Co3O4
OER Catalysts: Insight from Operando Spectroscopy and Fast EQCM‐D'
type: journal_article
user_id: '116779'
volume: 18
year: '2026'
...
---
_id: '36538'
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.
article_type: original
author:
- first_name: Johannes
full_name: Hiebl, Johannes
last_name: Hiebl
- first_name: Isabel
full_name: Steinhardt, Isabel
id: '90339'
last_name: Steinhardt
orcid: https://orcid.org/0000-0002-2590-6189
- first_name: Michael
full_name: Bigos, Michael
last_name: Bigos
citation:
ama: Hiebl J, Steinhardt I, Bigos M. Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien
in der Soziologie. die hochschule. 2022;(8):379-394. doi:10.3278/HSL2227W
apa: Hiebl, J., Steinhardt, I., & Bigos, M. (2022). Die (Un-)Sichtbarkeit von
(offenen) Bildungsmaterialien in der Soziologie. die hochschule, 8,
379–394. https://doi.org/10.3278/HSL2227W
bibtex: '@article{Hiebl_Steinhardt_Bigos_2022, title={Die (Un-)Sichtbarkeit von
(offenen) Bildungsmaterialien in der Soziologie}, DOI={10.3278/HSL2227W},
number={8}, journal={die hochschule}, author={Hiebl, Johannes and Steinhardt,
Isabel and Bigos, Michael}, year={2022}, pages={379–394} }'
chicago: 'Hiebl, Johannes, Isabel Steinhardt, and Michael Bigos. “Die (Un-)Sichtbarkeit
von (offenen) Bildungsmaterialien in der Soziologie.” die hochschule, no.
8 (2022): 379–94. https://doi.org/10.3278/HSL2227W.'
ieee: 'J. Hiebl, I. Steinhardt, and M. Bigos, “Die (Un-)Sichtbarkeit von (offenen)
Bildungsmaterialien in der Soziologie,” die hochschule, no. 8, pp. 379–394,
2022, doi: 10.3278/HSL2227W.'
mla: Hiebl, Johannes, et al. “Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien
in der Soziologie.” die hochschule, no. 8, 2022, pp. 379–94, doi:10.3278/HSL2227W.
short: J. Hiebl, I. Steinhardt, M. Bigos, die hochschule (2022) 379–394.
date_created: 2023-01-13T09:13:55Z
date_updated: 2023-01-13T09:22:13Z
ddc:
- '300'
department:
- _id: '121'
doi: 10.3278/HSL2227W
file:
- access_level: closed
content_type: application/pdf
creator: isste
date_created: 2023-01-13T09:11:05Z
date_updated: 2023-01-13T09:11:05Z
file_id: '36541'
file_name: 2022 Hiebl et al. Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien.pdf
file_size: 608633
relation: main_file
success: 1
file_date_updated: 2023-01-13T09:11:05Z
has_accepted_license: '1'
issue: '8'
keyword:
- Soziologie
- Praxistheorie
- Repositorien
- Open Educational Resources
- OER
language:
- iso: ger
main_file_link:
- open_access: '1'
url: https://www.wbv.de/shop/Die-Un-Sichtbarkeit-von-offenen-Bildungsmaterialien-in-der-Soziologie-HSL2227W
oa: '1'
page: 379-394
publication: die hochschule
publication_identifier:
issn:
- 2199-8825
publication_status: published
quality_controlled: '1'
status: public
title: Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien in der Soziologie
type: journal_article
user_id: '90339'
year: '2022'
...