Electrochemistry Application — Tailoring of electrocatalytic oxygen evolution reaction performance of 2D conductive Co-catecholate metal-organic frameworks

14 measurement groups · 41 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

CV double-layer capacitance and ECSA analysis

Voltammetry

Co-CAT-W catalyst ink on glassy carbon electrode · Electrode

Non-Faradaic potential region 1.0-1.2 V vs RHE; scan-rate series in 0.1 M KCl ferri-ferro neutral solution; ECSA calculated using geometric area 0.196 cm2 and Cs = 0.035 mF/cm2.

Atmosphere: 0.1 M KCl ferri-ferro solution
Geometry: drop-cast GCE electrode
Context: Co-CAT-W/Nafion/GCE electrode
Measurement source: 8 · 3.5. Electrocatalytic studies · Fig. 10a,c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Double-layer capacitance CdlMarked as a best value within this paper	0.272 mF/cm2	—	—	Text Exact Reported	8 · 3.5. Electrocatalytic studies · Fig. 10c
Electrochemically active surface areaMarked as a best value within this paper	0.55 cm2	—	—	Text Exact Reported	8 · 3.5. Electrocatalytic studies
Mass-normalised ECSAMarked as a best value within this paper	1.52 m2/g	—	—	Text Exact Reported	8 · 3.5. Electrocatalytic studies

CV double-layer capacitance and ECSA analysis

Voltammetry

Co-CAT-WO catalyst ink on glassy carbon electrode · Electrode

Non-Faradaic potential region 1.0-1.2 V vs RHE; scan-rate series in 0.1 M KCl ferri-ferro neutral solution; ECSA calculated using geometric area 0.196 cm2 and Cs = 0.035 mF/cm2.

Atmosphere: 0.1 M KCl ferri-ferro solution
Geometry: drop-cast GCE electrode
Context: Co-CAT-WO/Nafion/GCE electrode
Measurement source: 8 · 3.5. Electrocatalytic studies · Fig. 10b-c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Double-layer capacitance Cdl	0.203 mF/cm2	—	—	Text Exact Reported	8 · 3.5. Electrocatalytic studies · Fig. 10c
Electrochemically active surface area	0.4 cm2	—	—	Text Exact Reported	8 · 3.5. Electrocatalytic studies
Mass-normalised ECSA	1.14 m2/g	—	—	Text Exact Reported	8 · 3.5. Electrocatalytic studies

Chronoamperometry durability test

Chronoamperometry

Co-CAT-W catalyst ink on glassy carbon electrode · Electrode

Long-term chronoamperometry at onset potential 1.52 V vs RHE for 13 h in 1 M KOH.

Atmosphere: 1 M KOH
Geometry: drop-cast GCE electrode
Context: Co-CAT-W/Nafion/GCE electrode
Measurement source: 8 · 3.5. Electrocatalytic studies · Fig. 11

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Chronoamperometry durability duration	13 h	—	—	Text Exact Reported	8 · 3.5. Electrocatalytic studies · Fig. 11
Approximate final current density after 13 hMarked as a best value within this paper	approximately 0.40 mA/cm2 by visual read of Fig. 11	—	visual estimate from plot axis	Visual Estimate Approximate	10 · 3.5. Electrocatalytic studies · Fig. 11

Chronoamperometry durability test

Chronoamperometry

Co-CAT-WO catalyst ink on glassy carbon electrode · Electrode

Long-term chronoamperometry at onset potential 1.52 V vs RHE for 13 h in 1 M KOH.

Atmosphere: 1 M KOH
Geometry: drop-cast GCE electrode
Context: Co-CAT-WO/Nafion/GCE electrode
Measurement source: 8 · 3.5. Electrocatalytic studies · Fig. 11

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Approximate final current density after 13 h	approximately 0.36 mA/cm2 by visual read of Fig. 11	—	visual estimate from plot axis	Visual Estimate Approximate	10 · 3.5. Electrocatalytic studies · Fig. 11

Repeated cyclic voltammetry activation/stability

Voltammetry

Co-CAT-W catalyst ink on glassy carbon electrode · Electrode

25 repeated CV cycles in 1 M KOH between 0.9 and 1.6 V vs RHE at 10 mV/s.

Atmosphere: 1 M KOH
Geometry: drop-cast GCE electrode
Context: Co-CAT-W/Nafion/GCE electrode
Measurement source: 6 · 3.5. Electrocatalytic studies · Fig. 8b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Current reduction over 25 CV cyclesMarked as a best value within this paper	1.5%	—	—	Text Exact Reported	6 · 3.5. Electrocatalytic studies · Fig. 8b

Repeated cyclic voltammetry activation/stability

Voltammetry

Co-CAT-WO catalyst ink on glassy carbon electrode · Electrode

25 repeated CV cycles in 1 M KOH between 0.9 and 1.6 V vs RHE at 10 mV/s.

Atmosphere: 1 M KOH
Geometry: drop-cast GCE electrode
Context: Co-CAT-WO/Nafion/GCE electrode
Measurement source: 5 · 3.5. Electrocatalytic studies · Fig. 8a

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Current reduction over 25 CV cycles	13%	—	—	Text Exact Reported	5 · 3.5. Electrocatalytic studies · Fig. 8a

Cyclic voltammetry redox/HOMO-LUMO analysis

Voltammetry

Co-CAT-W catalyst ink on glassy carbon electrode · Electrode

First-cycle CV at 10 mV/s; redox peaks used for Co2+/Co3+ and HOMO/LUMO estimates.

Atmosphere: electrolyte not separately specified; OER context in alkaline electrolyte
Geometry: drop-cast GCE electrode
Context: Co-CAT-W/Nafion/GCE electrode
Measurement source: 9 · 3.5. Electrocatalytic studies · Fig. 12

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Electrochemical HOMO-LUMO gapMarked as a best value within this paper	0.56 eV	—	—	Calculated From Reported Exact Reported	9 · 3.5. Electrocatalytic studies · Fig. 12
HOMO energyMarked as a best value within this paper	-4.85 eV	—	—	Calculated From Reported Exact Reported	9 · 3.5. Electrocatalytic studies · Fig. 12
LUMO energy	-4.29 eV	—	—	Calculated From Reported Exact Reported	9 · 3.5. Electrocatalytic studies · Fig. 12
Anodic peak potentialMarked as a best value within this paper	1.34 V vs RHE	—	—	Text Exact Reported	9 · 3.5. Electrocatalytic studies · Fig. 12b
Cathodic peak potentialMarked as a best value within this paper	1.28 V vs RHE	—	—	Text Exact Reported	9 · 3.5. Electrocatalytic studies · Fig. 12b
Peak-to-peak separation Delta EpMarked as a best value within this paper	60 mV for n = 1	0.06 V	—	Text Rounded Reported	9 · 3.5. Electrocatalytic studies · Fig. 12b

Cyclic voltammetry redox/HOMO-LUMO analysis

Voltammetry

Co-CAT-WO catalyst ink on glassy carbon electrode · Electrode

First-cycle CV at 10 mV/s; redox peaks used for Co2+/Co3+ and HOMO/LUMO estimates.

Atmosphere: electrolyte not separately specified; OER context in alkaline electrolyte
Geometry: drop-cast GCE electrode
Context: Co-CAT-WO/Nafion/GCE electrode
Measurement source: 9 · 3.5. Electrocatalytic studies · Fig. 12

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Electrochemical HOMO-LUMO gap	0.66 eV	—	—	Calculated From Reported Exact Reported	9 · 3.5. Electrocatalytic studies · Fig. 12
HOMO energy	-4.95 eV	—	—	Calculated From Reported Exact Reported	9 · 3.5. Electrocatalytic studies · Fig. 12
LUMO energy	-4.29 eV	—	—	Calculated From Reported Exact Reported	9 · 3.5. Electrocatalytic studies · Fig. 12
Anodic peak potential	1.43 V vs RHE	—	—	Text Approximate	8 · 3.5. Electrocatalytic studies · Fig. 12b
Cathodic peak potential	1.32 V vs RHE	—	—	Text Approximate	8 · 3.5. Electrocatalytic studies · Fig. 12b
Peak-to-peak separation Delta Ep	110 mV	0.11 V	—	Text Rounded Reported	9 · 3.5. Electrocatalytic studies · Fig. 12b

Electrochemical impedance spectroscopy (EIS/PEIS)

Impedance spectroscopy

Co-CAT-W catalyst ink on glassy carbon electrode · Electrode

PEIS at 1.57 V vs RHE after sample activation; frequency range 100 kHz to 100 mHz.

Atmosphere: 1 M KOH
Geometry: drop-cast GCE electrode
Context: Co-CAT-W/Nafion/GCE electrode
Measurement source: 6 · 3.5. Electrocatalytic studies · Fig. 9

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CPE exponent nMarked as a best value within this paper	0.9	—	—	Text Exact Reported	6 · 3.5. Electrocatalytic studies
Single semicircle resistance	591 ohm	—	—	Text Rounded Reported	6 · 3.5. Electrocatalytic studies · Fig. 9

Electrochemical impedance spectroscopy (EIS/PEIS)

Impedance spectroscopy

Co-CAT-WO catalyst ink on glassy carbon electrode · Electrode

PEIS at 1.57 V vs RHE after sample activation; frequency range 100 kHz to 100 mHz.

Atmosphere: 1 M KOH
Geometry: drop-cast GCE electrode
Context: Co-CAT-WO/Nafion/GCE electrode
Measurement source: 6 · 3.5. Electrocatalytic studies · Fig. 9

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CPE exponent n	0.5	—	—	Text Exact Reported	6 · 3.5. Electrocatalytic studies
Charge-transfer resistance RctMarked as a best value within this paper	445 ohm	—	—	Text Rounded Reported	6 · 3.5. Electrocatalytic studies · Fig. 9
Ionic resistance Ri	49 ohm	—	—	Text Rounded Reported	6 · 3.5. Electrocatalytic studies · Fig. 9

Linear sweep voltammetry (LSV) for OER

Voltammetry

Co-CAT-W catalyst ink on glassy carbon electrode · Electrode

1 M KOH; three-electrode setup with Pt counter, Ag/AgCl reference, GCE working electrode; potentials converted to RHE; LSV before and after 25 CV cycles.

Atmosphere: alkaline electrolyte; gas atmosphere not reported
Geometry: glassy carbon working electrode with drop-cast catalyst ink
Context: Co-CAT-W/Nafion/GCE electrode
Measurement source: 3 · 2.4. Electrocatalytic measurements · Fig. 7a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER overpotential at 10 mA/cm2 after durability cycleMarked as a best value within this paper	eta10 = 424 mV at 1.65 V vs RHE	0.424 V	—	Text Exact Reported	5 · 3.5. Electrocatalytic studies · Fig. 7d; Table 2
OER overpotential at 10 mA/cm2 before CV cycleMarked as a best value within this paper	401 mV at 10 mA/cm2	0.401 V	—	Table Exact Reported	9 · Table 2 · Table 2
Overpotential at 1.7 V vs RHE after CV activation	478 mV at 1.7 V vs RHE for post-CV LSV comparison	—	—	Text Rounded Reported	5 · 3.5 Electrocatalytic studies · Fig. 7b
Current density at 1.7 V vs RHE after 25 CV cyclesMarked as a best value within this paper	37.2 mA/cm2	—	—	Text Exact Reported	5 · 3.5. Electrocatalytic studies · Fig. 7b
Current density at 1.7 V vs RHE before CV activationMarked as a best value within this paper	74 mA/cm2	—	—	Text Rounded Reported	5 · 3.5. Electrocatalytic studies · Fig. 7a
Overpotential at 1.7 V vs RHE before CV activation	470 mV at 1.7 V vs RHE	—	—	Text Rounded Reported	5 · 3.5 Electrocatalytic studies · Fig. 7a

Linear sweep voltammetry (LSV) for OER

Voltammetry

Co-CAT-WO catalyst ink on glassy carbon electrode · Electrode

1 M KOH; three-electrode setup with Pt counter, Ag/AgCl reference, GCE working electrode; potentials converted to RHE; LSV before and after 25 CV cycles.

Atmosphere: alkaline electrolyte; gas atmosphere not reported
Geometry: glassy carbon working electrode with drop-cast catalyst ink
Context: Co-CAT-WO/Nafion/GCE electrode
Measurement source: 3 · 2.4. Electrocatalytic measurements · Fig. 7a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER overpotential at 10 mA/cm2 after durability cycle	eta10 = 455 mV at 1.68 V vs RHE	0.455 V	—	Text Exact Reported	5 · 3.5. Electrocatalytic studies · Fig. 7d; Table 2
Current density at 1.7 V vs RHE after 25 CV cycles	11.6 mA/cm2	—	—	Text Exact Reported	5 · 3.5. Electrocatalytic studies · Fig. 7b
Current density at 1.7 V vs RHE before CV activation	6.6 mA/cm2	—	—	Text Exact Reported	5 · 3.5. Electrocatalytic studies · Fig. 7a
Overpotential at 1.7 V vs RHE before CV activation	470 mV at 1.7 V vs RHE	—	—	Text Rounded Reported	5 · 3.5 Electrocatalytic studies · Fig. 7a

Tafel analysis derived from LSV

Voltammetry Tafel and polarisation analysis

Co-CAT-W catalyst ink on glassy carbon electrode · Electrode

Tafel plots derived from OER LSV polarisation curves before and after CV activation.

Atmosphere: 1 M KOH
Geometry: drop-cast GCE electrode
Context: Co-CAT-W/Nafion/GCE electrode
Measurement source: 6 · 3.5. Electrocatalytic studies · Fig. 7c; Table 2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Tafel slope after activation	60 mV/dec	—	—	Text Rounded Reported	6 · 3.5. Electrocatalytic studies · Fig. 7c; Table 2
Tafel slope before CV activationMarked as a best value within this paper	51 mV/dec	—	—	Text Rounded Reported	6 · 3.5. Electrocatalytic studies · Fig. 7c inset; Table 2

Tafel analysis derived from LSV

Voltammetry Tafel and polarisation analysis

Co-CAT-WO catalyst ink on glassy carbon electrode · Electrode

Tafel plots derived from OER LSV polarisation curves after CV activation unless stated.

Atmosphere: 1 M KOH
Geometry: drop-cast GCE electrode
Context: Co-CAT-WO/Nafion/GCE electrode
Measurement source: 6 · 3.5. Electrocatalytic studies · Fig. 7c; Table 2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Tafel slope after activation	142 mV/dec	—	—	Text Rounded Reported	6 · 3.5. Electrocatalytic studies · Fig. 7c; Table 2