Electrochemistry Application — Quantum Effects Allow the Construction of Two-Dimensional Co3O4-Embedded Nitrogen-Doped Porous Carbon Nanosheet Arrays from Bimetallic MOFs as Bifunctional Oxygen Electrocatalysts

11 measurement groups · 16 results

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

Double-layer capacitance from CV scan-rate series

Voltammetry

2D-MCo3O4-NCNAs-15-900 · Nanosheet

CV curves of 2D-MCo3O4-NCNAs; capacitive current measured at 1.21 V vs RHE as a function of scan rate.

Temperature: room temperature
Atmosphere: 1 M KOH electrolyte
Geometry: glassy carbon electrode
Context: target MOF-derived nanosheet catalyst
Measurement source: 14528 · Results and Discussion · Figure 7e-f

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Double-layer capacitanceMarked as a best value within this paper	27.11 mF cm-2	—	—	Figure Axis Exact Reported	14528 · Results and Discussion · Figure 7f

Double-layer capacitance from CV scan-rate series

Voltammetry

commercial IrO2 OER reference electrode · Electrode

CV curves and capacitive current measured at 1.21 V vs RHE as a function of scan rate for IrO2.

Temperature: room temperature
Atmosphere: 1 M KOH electrolyte
Geometry: glassy carbon electrode
Context: commercial non-MOF reference
Measurement source: 5 · Supporting Information · Figure S10

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Double-layer capacitance	17.63 mF cm-2	—	—	Figure Axis Exact Reported	5 · Supporting Information · Figure S10b

Electrochemical impedance spectroscopy

Impedance spectroscopy

2D-MCo3O4-NCNAs-15-900 · Nanosheet

OER EIS at onset potential, 5 mV AC amplitude, 0.01 Hz to 100 kHz.

Temperature: room temperature
Atmosphere: 1 M KOH electrolyte
Geometry: glassy carbon electrode
Context: target MOF-derived nanosheet catalyst
Measurement source: 14527 · Results and Discussion · Figure 7c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER charge-transfer resistanceMarked as a best value within this paper	13.6 ohm	—	—	Text Exact Reported	14527 · Results and Discussion · Figure 7c

Electrochemical impedance spectroscopy

Impedance spectroscopy

commercial IrO2 OER reference electrode · Electrode

OER EIS at onset potential for commercial IrO2.

Temperature: room temperature
Atmosphere: 1 M KOH electrolyte
Geometry: glassy carbon electrode
Context: commercial non-MOF reference
Measurement source: 14527 · Results and Discussion · Figure 7c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER charge-transfer resistance	19.1 ohm	—	—	Text Exact Reported	14527 · Results and Discussion · Figure 7c

OER LSV and Tafel analysis

Voltammetry Tafel and polarisation analysis

2D-MCo3O4-NCNAs-15-900 · Nanosheet

1 M KOH, scan rate 10 mV s-1, glassy carbon electrode 3 mm; Pt wire counter, saturated Ag/AgCl reference; values converted to RHE without iR correction.

Temperature: room temperature
Atmosphere: O2-purged aqueous electrolyte
Geometry: glassy carbon electrode
Context: target MOF-derived nanosheet catalyst
Measurement source: 14527 · Results and Discussion · Figure 7a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER onset potentialMarked as a best value within this paper	1.54 V vs RHE	—	—	Text Exact Reported	14527 · Results and Discussion · Figure 7a
OER overpotentialMarked as a best value within this paper	340 mV vs RHE	—	—	SI Table Exact Reported	6 · Supporting Information · Table S1
OER Tafel slopeMarked as a best value within this paper	74 mV dec-1	—	—	Text Exact Reported	14527 · Results and Discussion · Figure 7b; Table S1

ORR LSV using rotating ring-disk electrode

Voltammetry

2D-MCo3O4-NCNAs-15-900 · Nanosheet

O2-saturated 0.1 M KOH, scan rate 10 mV s-1; GC RRDE 5.5 mm working electrode, Pt wire counter, saturated Ag/AgCl reference; values converted to RHE without iR correction.

Temperature: room temperature
Atmosphere: O2-saturated electrolyte
Geometry: glassy carbon RRDE
Context: target MOF-derived nanosheet catalyst
Measurement source: 14527,14529 · Results and Discussion; Electrochemical measurements · Figure 6a; Table S2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ORR half-wave potentialMarked as a best value within this paper	0.74 V vs RHE	—	—	Text Exact Reported	14527 · Results and Discussion · Figure 6a; Table S2
ORR diffusion-limited current densityMarked as a best value within this paper	6.89 mA cm-2	—	—	Text Exact Reported	14527 · Results and Discussion · Figure 6a
ORR onset potentialMarked as a best value within this paper	0.88 V vs RHE	—	—	Text Exact Reported	14527 · Results and Discussion · Figure 6a; Table S2

ORR RRDE peroxide yield and electron transfer calculation

2D-MCo3O4-NCNAs-15-900 · Nanosheet

O2-saturated 0.1 M KOH; RRDE collection efficiency N = 0.36.

Temperature: room temperature
Atmosphere: O2-saturated electrolyte
Geometry: glassy carbon RRDE
Context: target MOF-derived nanosheet catalyst
Measurement source: 14527,14529 · Results and Discussion; Electrochemical measurements · Figure 6b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ORR electron transfer numberMarked as a best value within this paper	approximately 3.9 at 0-0.6 V	—	approximately	Text Approximate	14527 · Results and Discussion · Figure 6b
ORR H2O2 yieldMarked as a best value within this paper	approximately 3%	—	approximately	Text Approximate	14527 · Results and Discussion · Figure 6b; Figure S9

ORR RRDE peroxide yield

Co3O4-NC-10-900 · Powder

O2-saturated 0.1 M KOH; comparison with target catalyst.

Temperature: room temperature
Atmosphere: O2-saturated electrolyte
Geometry: glassy carbon RRDE
Context: MOF-derived control product
Measurement source: 14527 · Results and Discussion · Figure S9

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ORR H2O2 yield	approximately 6%	—	approximately	Text Approximate	14527 · Results and Discussion · Figure S9

ORR RRDE peroxide yield

Co3O4-NC-5-900 · Powder

O2-saturated 0.1 M KOH; comparison with target catalyst.

Temperature: room temperature
Atmosphere: O2-saturated electrolyte
Geometry: glassy carbon RRDE
Context: MOF-derived control product
Measurement source: 14527 · Results and Discussion · Figure S9

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ORR H2O2 yield	approximately 7%	—	approximately	Text Approximate	14527 · Results and Discussion · Figure S9

Chronoamperometry

2D-MCo3O4-NCNAs-15-900 · Nanosheet

ORR durability at 0.4 V in O2-saturated 0.1 M KOH for 30000 s.

Temperature: room temperature
Atmosphere: O2-saturated electrolyte
Geometry: glassy carbon RRDE
Context: target MOF-derived nanosheet catalyst
Measurement source: 14527 · Results and Discussion · Figure 6c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ORR current retention after 30000 sMarked as a best value within this paper	approximately 88-90% of initial current after 30000 s	—	visual estimate	Visual Estimate Approximate	14527 · Results and Discussion · Figure 6c

Chronoamperometry

commercial Pt/C ORR reference electrode · Electrode

ORR durability at 0.4 V in O2-saturated 0.1 M KOH; commercial Pt/C reference.

Temperature: room temperature
Atmosphere: O2-saturated electrolyte
Geometry: glassy carbon RRDE
Context: commercial non-MOF reference
Measurement source: 14527 · Results and Discussion · Figure 6c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Pt/C ORR current retention	approximately 65% of initial current after ca. 15000 s	—	visual estimate	Visual Estimate Approximate	14527 · Results and Discussion · Figure 6c