Electrochemistry Application — From Low-to High-Crystallinity Bimetal-Organic Framework Nanosheet with Highly Exposed Boundaries: An Efficient and Stable Electrocatalyst for Oxygen Evolution Reaction

4 measurement groups · 17 results

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

Cyclic voltammetry at varied scan rates

Voltammetry

(U+S)-CoFe-MOF on glassy carbon electrode · Electrode

CV potential window 0.22-0.32 V vs Ag/AgCl; scan rates 10-120 mV s-1; slope of Delta J at 0.27 V used to represent ECSA.

Atmosphere: 1 M KOH
Geometry: MOF/Nafion on GC electrode
Context: MOF-coated electrode comparison
Measurement source: 3,8 · Electrochemical Characterizations; Results and Discussion · Figure 5e; Figure S9

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CV-derived Delta J versus scan-rate slopesMarked as a best value within this paper	(U+S)-CoFe-MOF 4.28; U-CoFe-MOF 2.68; S-CoFe-MOF 2.17	—	—	Figure Axis Rounded Reported	7 · Results and Discussion · Figure 5e

Electrochemical impedance spectroscopy / Nyquist plot

Impedance spectroscopy

(U+S)-CoFe-MOF on glassy carbon electrode · Electrode

Charge-transfer resistance at open potential for CoFe-MOF electrodes.

Atmosphere: 1 M KOH
Geometry: MOF/Nafion on GC electrode
Context: MOF-coated electrode comparison
Measurement source: 8 · Results and Discussion · Figure 5f

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Control charge-transfer resistances	U-CoFe-MOF 13.3 Ohm; S-CoFe-MOF 20.5 Ohm	—	—	Text Exact Reported	8 · Results and Discussion · Figure 5f
(U+S)-CoFe-MOF charge-transfer resistanceMarked as a best value within this paper	8.8 Ohm	—	—	Text Exact Reported	8 · Results and Discussion · Figure 5f

Linear sweep voltammetry and Tafel analysis

Voltammetry Tafel and polarisation analysis

(U+S)-CoFe-MOF on glassy carbon electrode · Electrode

O2-saturated 1 M KOH; three-electrode cell; 5 mV s-1 scan rate; potentials converted to RHE and 90% iR compensation.

Atmosphere: O2-saturated electrolyte
Geometry: MOF/Nafion on 3 mm GC working electrode; graphite counter; Ag/AgCl reference
Context: MOF-coated electrode comparison
Measurement source: 3,7 · Electrochemical Characterizations; Results and Discussion · Figure 5a-c; Table S2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Overpotential at 20 mA cm-2 from Figure 5bMarked as a best value within this paper	(U+S) about 0.287 V; U about 0.314 V; S about 0.343 V	287 mV	visual estimate +/-0.005 V	Figure Axis Approximate	7 · Results and Discussion · Figure 5b
S-CoFe-MOF overpotential at 10 mA cm-2	310 mV	0.31 V	—	SI Table Exact Reported	7 · Supporting Information · Table S2
U-CoFe-MOF overpotential at 10 mA cm-2	300 mV	0.3 V	—	SI Table Exact Reported	7 · Supporting Information · Table S2
(U+S)-CoFe-MOF overpotential at 10 mA cm-2Marked as a best value within this paper	277 mV	0.277 V	—	SI Table Exact Reported	7 · Supporting Information · Table S2
Relative TOF comparisonMarked as a best value within this paper	(U+S)-CoFe-MOF 100%; U-CoFe-MOF about 37%; S-CoFe-MOF about 26%	1 relative fraction	control values visual estimates +/-5 percentage points	Figure Axis Approximate	7 · Figure caption and Results · Figure 5d
Control Tafel slopes	U-CoFe-MOF 40 mV dec-1; S-CoFe-MOF 56 or 57 mV dec-1; RuO2 62 mV dec-1	—	S-CoFe-MOF appears as 57 mV dec-1 in the main text and 56 mV dec-1 in Table S2	Text Rounded Reported	8 · Results and Discussion · Figure 5c; Table S2
(U+S)-CoFe-MOF Tafel slopeMarked as a best value within this paper	31 mV dec-1	—	—	SI Table Exact Reported	7 · Supporting Information · Table S2
Control potentials at 10 mA cm-2	U-CoFe-MOF 1.530 V; S-CoFe-MOF 1.540 V; commercial RuO2 1.582 V vs RHE	—	—	Text Exact Reported	7 · Results and Discussion · Figure 5a
(U+S)-CoFe-MOF potential at 10 mA cm-2Marked as a best value within this paper	1.507 V vs RHE	—	—	Text Exact Reported	7 · Results and Discussion · Figure 5a

Chronopotentiometric/cycling stability at constant current and post-OER characterisation

Galvanostatic cycling

(U+S)-CoFe-MOF on glassy carbon electrode · Electrode

10 mA cm-2 for 2000 s in alkaline OER conditions; LSV before/after; TEM, EDX and XPS after cycling.

Atmosphere: 1 M KOH OER electrolyte
Geometry: MOF/Nafion on GC electrode
Context: MOF-coated electrode comparison after OER
Measurement source: 8-9 · Results and Discussion · Figure 6; Table S3; Figure S10

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Post-OER morphology and composition retention	nanosheet morphology, hierarchical porosity and Co/Fe distribution retained after cycling	—	—	Text Qualitative	8-9 · Results and Discussion · Figure 6b-f
Control overpotential rate of change after cycling	S-CoFe-MOF 3.4%; U-CoFe-MOF 2.7%; RuO2 9.1%	—	—	SI Table Exact Reported	8 · Supporting Information · Table S3
Stability test duration/current density	10 mA cm-2 for 2000 s	—	—	Text Exact Reported	8 · Results and Discussion · Figure 6a
(U+S)-CoFe-MOF overpotential rate of change after cyclingMarked as a best value within this paper	1.0%	0.01 fraction	—	SI Table Exact Reported	8 · Supporting Information · Table S3
Organic ligand detected after OER	almost no organic ligand was detected after the cycling of OER	—	—	Text Qualitative	9 · Results and Discussion · Figure S10