CV-preconditioning study of Co3O4 nanoparticles

Type: Idea or experiment plan

ObjectId: 35983

Created: 11/10/2025 10:23:25 AM by A09) Anastasiia Kotova [kotovaai2015@gmail.com]

Updated: 6/15/2026 10:57:55 AM by A09) Anastasiia Kotova [kotovaai2015@gmail.com]

Access: Public Sort Code (asc): 0

License: CC BY 4.0

Description:

To study the effect of pre-conditioning on Co3O4 OER activity by tuning the catalyst during pre-OER by using different CV/LSV scan rates. This provides a comprehensive indication of the integrated charge (Qimb), which can be used to classify the pre-conditioning protocols as charge balanced (Qimb≈0), anodic excess (Qimb>0), and cathodic excess (Qimb<0) regimes.

To evaluate OER activity LSV and EIS will be applied. To reveal structural differences ex-situ Raman and XPS will be conducted as a post-electrochemical characterisation.

[no file attached]

Associated Objects

  • Catalysis Science & Technology, 2026 (Kotova)
    Publication

    Kotova A., Hernandez S., Bendt G., Schulz S., Dudarev V., Ludwig A., Tschulik K., Linnemann J. "Controlling structural transformations of cobalt spinel catalyst surfaces under electrochemical conditions towards a mechanistic understanding of the alkaline oxygen evolution reaction", Catalysis Science & Technology, 2026.

  • 250710_cpy131_repro_ECbalanced_03
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30CVs (from OCP to 0.60V vs. Hg/HgO, scan rate 50 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.62V - 0.70V vs. Hg/HgO (20 mV step)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250710_cpy131_repro_ECanodicX_01
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30CVs (from OCP to 0.55V vs. Hg/HgO, scan rate 0.5 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.62V- 0.70V vs. Hg/HgO (20 mV step)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250408_cpy131_repro_ECbalanced_01
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30CVs (from OCP to 0.60V vs. Hg/HgO, scan rate 50 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.68V vs. Hg/HgO
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250416_cpy131_repro_ECcathodicX_01
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30LSVs (from OCP to 0.60V vs. Hg/HgO, scan rate 50 mV/s)
    • 30LSVs (from 0.60V to OCP vs. Hg/HgO, scan rate 0.5 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250417_cpy131_repro_ECanodicX_04
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30CVs (from OCP to 0.55V vs. Hg/HgO, scan rate 0.5 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 10912 cpy131_repro_ECnot-preconditioned_01
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • CV_activity (from OCP to 0.73V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.62V - 0.70V vs. Hg/HgO (20 mV step)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 10913 cpy131_repro_ECnot-preconditioned_02
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • CV_activity (from OCP to 0.73V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.62V - 0.70V vs. Hg/HgO (20 mV step)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 10914 cpy131_repro_ECnot-preconditioned_03
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • CV_activity (from OCP to 0.73V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.62V - 0.70V vs. Hg/HgO (20 mV step)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250710_cpy131_repro_ECbalanced_4
    Nanoparticle powder sample

    250710_cpy131_repro_ECbalanced_03 EC modified

  • cpy131_repro_ECnot-preconditioned_04
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • CV_activity (from OCP to 0.73V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.62V - 0.70V vs. Hg/HgO (20 mV step)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • cpy131_repro_ECnot-preconditioned_5
    Nanoparticle powder sample

    cpy131_repro_ECnot-preconditioned_04 EC modified

  • 250408_cpy131_repro_ECbalanced_2
    Nanoparticle powder sample

    250408_cpy131_repro_ECbalanced_01 was EC modified

  • 250416_cpy131_repro_ECcathodicX_2
    Nanoparticle powder sample

    250416_cpy131_repro_ECcathodicX_01 was EC modified

  • 250417_cpy131_repro_ECanodicX_5
    Nanoparticle powder sample

    250417_cpy131_repro_ECanodicX_04 was EC modified

  • 250415_cpy131_repro_ECbalanced_03
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30CVs (from OCP to 0.60V vs. Hg/HgO, scan rate 50 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250415_cpy131_repro_ECbalanced_05
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30CVs (from OCP to 0.60V vs. Hg/HgO, scan rate 50 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250511_cpy131_repro_ECanodicX_06
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30CVs (from OCP to 0.55V vs. Hg/HgO, scan rate 0.5 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250512_cpy131_repro_ECanodicX_08
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30CVs (from OCP to 0.55V vs. Hg/HgO, scan rate 0.5 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250511_cpy131_repro_ECcathodicX_03
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30LSVs (from OCP to 0.60V vs. Hg/HgO, scan rate 50 mV/s)
    • 30LSVs (from 0.60V to OCP vs. Hg/HgO, scan rate 0.5 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250513_cpy131_repro_ECcathodicX_05
    Nanoparticle powder sample

    The freshly prepared ink of 1 µg/µL Co3O4 NPs (cpy131_repro) sonicated (Elmasonic P, 37 Hz, power = 100) in DI water for 15 min. A glassy carbon disk electrode with a geometric area of 0.5 cm2 (RDE) was polished (3.00 min, GCE polish disks 1 μm, 0.3 μm and 0.05 μm with Al2O3 suspension), loaded with 50 μL of ink by drop casting (micropipette, catalyst loading 100 µg cm-2), and dried for 30 min under Ar stream with heating at 65 oC. 200ml of 100mM KOH was Ar bubbled before experimant for 15 min.

    • OCP
    • EIS at OCP
    • 10CVs (from OCP to 0.40V vs. Hg/HgO, scan rate 50 mV/s)
    • 30LSVs (from OCP to 0.60V vs. Hg/HgO, scan rate 50 mV/s)
    • 30LSVs (from 0.60V to OCP vs. Hg/HgO, scan rate 0.5 mV/s)
    • LSV (from OCP to 0.73 V vs. Hg/HgO, scan rate 5 mV/s)
    • EIS @ 0.73V vs. Hg/HgO
    • EIS @ 0.75V vs. Hg/HgO
    • EIS @ 0.80V vs. Hg/HgO
    • OCP

  • 250415_cpy131_repro_ECbalanced_4
    Nanoparticle powder sample

    250415_cpy131_repro_ECbalanced_03 was EC modified

  • 250415_cpy131_repro_ECbalanced_6
    Nanoparticle powder sample

    250415_cpy131_repro_ECbalanced_05 was EC modified

  • 250511_cpy131_repro_ECanodicX_7
    Nanoparticle powder sample

    250511_cpy131_repro_ECanodicX_06 was EC modified

  • 250512_cpy131_repro_ECanodicX_9
    Nanoparticle powder sample

    250512_cpy131_repro_ECanodicX_08 was EC modified

  • 250511_cpy131_repro_ECcathodicX_4
    Nanoparticle powder sample

    250511_cpy131_repro_ECcathodicX_03 was EC modified

  • 250513_cpy131_repro_ECcathodicX_6
    Nanoparticle powder sample

    250513_cpy131_repro_ECcathodicX_05 was EC modified

All properties (except table)

Include all template properties
Type Name Value Comment
Measurements Report
Int XPS 1 TypeIds CSV to include in the report column (1 - include to report):, 30
Int OCP 2 TypeIds CSV to include in the report column (1 - include to report):, 73
Int CV 3 TypeIds CSV to include in the report column (1 - include to report):, 61, 68
Int LSV 1 TypeIds CSV to include in the report column (1 - include to report):, 71
Int EIS 8 TypeIds CSV to include in the report column (1 - include to report):, 72
Int Raman 1 TypeIds CSV to include in the report column (1 - include to report):, 70, 144, 221

The table

No properties for rendering in a table found

Report (Samples and Measurements)

SampleId ObjectName N System SubstrateMaterial XPS OCP CV LSV EIS Raman
ObjectId_27604250408_cpy131_repro_ECbalanced_012Co-O012040
ObjectId_27633250710_cpy131_repro_ECanodicX_012Co-O023080
ObjectId_27634250416_cpy131_repro_ECcathodicX_012Co-O022140
10909250710_cpy131_repro_ECbalanced_032Co-O022180
10911250417_cpy131_repro_ECanodicX_042Co-O023040
1091210912 cpy131_repro_ECnot-preconditioned_012Co-O021190
1091310913 cpy131_repro_ECnot-preconditioned_022Co-O021190
1091410914 cpy131_repro_ECnot-preconditioned_032Co-O021190
10910250710_cpy131_repro_ECbalanced_42Co-O000000
ObjectId_37765cpy131_repro_ECnot-preconditioned_042Co-O021190
ObjectId_37766cpy131_repro_ECnot-preconditioned_52Co-O000000
ObjectId_37790250408_cpy131_repro_ECbalanced_22Co-O000000
ObjectId_37791250416_cpy131_repro_ECcathodicX_22Co-O700000
10911250417_cpy131_repro_ECanodicX_52Co-O000000
ObjectId_37817250415_cpy131_repro_ECbalanced_032Co-O022040
ObjectId_37818250415_cpy131_repro_ECbalanced_052Co-O022040
ObjectId_37819250511_cpy131_repro_ECanodicX_062Co-O022040
ObjectId_37820250512_cpy131_repro_ECanodicX_082Co-O022150
ObjectId_37821250511_cpy131_repro_ECcathodicX_032Co-O021150
ObjectId_37822250513_cpy131_repro_ECcathodicX_052Co-O021150
ObjectId_37823250415_cpy131_repro_ECbalanced_42Co-O1100000
ObjectId_37824250415_cpy131_repro_ECbalanced_62Co-O900000
ObjectId_37834250511_cpy131_repro_ECanodicX_72Co-O800000
ObjectId_37867250512_cpy131_repro_ECanodicX_92Co-O800000
ObjectId_37887250511_cpy131_repro_ECcathodicX_42Co-O700000
ObjectId_37904250513_cpy131_repro_ECcathodicX_62Co-O700000