---
res:
  bibo_abstract:
  - 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.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Christian
      foaf_name: Leppin, Christian
      foaf_surname: Leppin
      foaf_workInfoHomepage: http://www.librecat.org/personId=117722
  - foaf_Person:
      foaf_givenName: Carsten
      foaf_name: Placke‐Yan, Carsten
      foaf_surname: Placke‐Yan
  - foaf_Person:
      foaf_givenName: Georg
      foaf_name: Bendt, Georg
      foaf_surname: Bendt
  - foaf_Person:
      foaf_givenName: Sheila
      foaf_name: Hernandez, Sheila
      foaf_surname: Hernandez
  - foaf_Person:
      foaf_givenName: Kristina
      foaf_name: Tschulik, Kristina
      foaf_surname: Tschulik
  - foaf_Person:
      foaf_givenName: Stephan
      foaf_name: Schulz, Stephan
      foaf_surname: Schulz
  - foaf_Person:
      foaf_givenName: Julia
      foaf_name: Linnemann, Julia
      foaf_surname: Linnemann
      foaf_workInfoHomepage: http://www.librecat.org/personId=116779
    orcid: 0000-0001-6883-5424
  bibo_doi: 10.1002/cctc.202501104
  bibo_issue: '2'
  bibo_volume: 18
  dct_date: 2026^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/1867-3880
  - http://id.crossref.org/issn/1867-3899
  dct_language: eng
  dct_publisher: Wiley@
  dct_subject:
  - electrocatalysis
  - Co3O4
  - EQCM-D
  - OER
  dct_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@'
...