Electrochemistry Application — High-Entropy Metal-Organic Framework Arrays Boost Oxygen Evolution Electrocatalysis

9 measurement groups · 62 results

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

three-electrode OER; LSV, Tafel, EIS, chronoamperometry and double-layer capacitance

Impedance spectroscopy Voltammetry Tafel and polarisation analysis Chronoamperometry

HE-MOF nanosheet array electrode on nickel foam · Electrode

1 M KOH; catalyst working electrode, graphite rod counter electrode, Hg/Hg2Cl2 reference; LSV at 5 mV s-1 with 85% iR compensation; EIS 100000 to 0.01 Hz at 10 mA cm-2; Cdl from 100-200 mV s-1 CVs.

Geometry: electrode on nickel foam
Context: HE-MOF and controls on NF
Measurement source: 14096 · 2.4. Electrochemical Measurement

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source

OER LSV/Tafel/EIS/Cdl controls

Impedance spectroscopy Voltammetry Tafel and polarisation analysis

pristine nickel foam · Electrode

1.0 M KOH; pure NF and IrO2/NF benchmark controls.

Geometry: NF electrode and IrO2-coated NF electrode
Context: non-MOF controls
Measurement source: 14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figures 3 and S22

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
IrO2 Cdl	5.16 mF cm-2	—	—	Figure Axis Approximate	S24 · Supplementary Data · Figure S22
IrO2 eta50 overpotential	346 mV	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3d
IrO2 Tafel slope	84 mV dec-1	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3b
NF Cdl	5.38 mF cm-2	—	—	Figure Axis Approximate	S24 · Supplementary Data · Figure S22
pure NF eta50 overpotential	549 mV	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3d
NF Tafel slope	103 mV dec-1	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3b

OER LSV/EIS/Cdl comparison for double-metal MOFs

Impedance spectroscopy Voltammetry

NiFe-MOF electrode on NF · Electrode

1.0 M KOH; Figure S15 LSV/EIS, Figure S19 Cdl; result rows specify individual samples in result names.

Geometry: MOF electrodes on NF
Context: double-metal comparison controls
Measurement source: 14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figures S15 and S19

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CoFe-MOF CdlMarked as a best value within this paper	8.86 mF cm-2	—	—	Figure Axis Approximate	S21 · Supplementary Data · Figure S19
NiCo-MOF Cdl	4.47 mF cm-2	—	—	Figure Axis Approximate	S21 · Supplementary Data · Figure S19
NiFe-MOF Cdl	2.99 mF cm-2	—	—	Figure Axis Approximate	S21 · Supplementary Data · Figure S19
NiMo-MOF Cdl	4.98 mF cm-2	—	—	Figure Axis Approximate	S21 · Supplementary Data · Figure S19
NiZn-MOF Cdl	3.89 mF cm-2	—	—	Figure Axis Approximate	S21 · Supplementary Data · Figure S19
CoFe-MOF eta50 overpotential	381 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S15
NiCo-MOF eta50 overpotential	422 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S15
NiFe-MOF eta50 overpotentialMarked as a best value within this paper	357 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figures 3d and S15
NiMo-MOF eta50 overpotential	439 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S15
NiZn-MOF eta50 overpotential	487 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S15
NiFe-MOF Tafel slope	83 mV dec-1	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3b

OER LSV/Tafel/EIS/Cdl/stability

Impedance spectroscopy Voltammetry Tafel and polarisation analysis

HE-MOF nanosheet array electrode on nickel foam · Electrode

1.0 M KOH; 85% iR-compensated LSV at 5 mV s-1; CV scan rates 100-200 mV s-1 for Cdl.

Geometry: 2D HE-MOF array on NF
Context: target mixed-metal MOF electrode
Measurement source: 14098-14100 · 3.2 Electrochemical Oxygen Evolution Performance · Figures 3-4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
HE-MOF EIS relative charge-transfer resistanceMarked as a best value within this paper	semicircle presents a distinctly smaller radius than Fe-MOF, NiFe-MOF, NiFeZn-MOF, NiFeZnMo-MOF, NF and IrO2	—	—	Qualitative Qualitative	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3c
HE-MOF double-layer capacitanceMarked as a best value within this paper	3.19 mF cm-2	—	—	Text Exact Reported	14100 · 3.3 Mechanism · Figure 4f
HE-MOF eta100 overpotentialMarked as a best value within this paper	272 mV at 100 mA cm-2	—	—	SI Table Exact Reported	S27 · Supplementary Data · Table S2
HE-MOF eta50 overpotentialMarked as a best value within this paper	254 mV at 50 mA cm-2	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3a,d
HE-MOF high-current stability test maximum current density	stable up to 1000 mA cm-2 after a 5 h test	—	—	Text Qualitative	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S12
HE-MOF OER durability time	almost no drop after 100 h	—	—	Text Qualitative	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3f
HE-MOF Tafel slopeMarked as a best value within this paper	61 mV dec-1	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3b
HE-MOF CV redox feature assigned to active intermediate	oxidation and reduction peaks attributed to MO6/MOOH intermediate formation	—	—	Qualitative Qualitative	14100 · 3.3 Mechanism · Figure S23

OER LSV/EIS/Cdl

Impedance spectroscopy Voltammetry

HE-MOF bulk drop-cast electrode · Electrode

1.0 M KOH; bulk morphology control.

Geometry: drop-cast HE-MOF bulk on NF
Context: morphology control with binder
Measurement source: 14100 · 3.3 Mechanism · Figure 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
HE-MOF bulk double-layer capacitance	2.44 mF cm-2	—	—	Text Exact Reported	14100 · 3.3 Mechanism · Figure 4f
HE-MOF bulk eta50 overpotential	370 mV	—	—	Text Exact Reported	14100 · 3.3 Mechanism · Figure 4a

OER LSV/EIS/Cdl

Impedance spectroscopy Voltammetry

HE-MOF powder · Powder

1.0 M KOH; compared with HE-MOF array and HE-MOF bulk.

Geometry: powder-derived electrode
Context: morphology control
Measurement source: 14100 · 3.3 Mechanism · Figure 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
HE-MOF powder double-layer capacitance	2.80 mF cm-2	—	—	Text Exact Reported	14100 · 3.3 Mechanism · Figure 4f
HE-MOF powder eta50 overpotential	339 mV	—	—	Text Exact Reported	14100 · 3.3 Mechanism · Figure 4a

OER LSV/EIS/Cdl comparison for quadruple-metal MOFs

Impedance spectroscopy Voltammetry

NiFeZnMo-MOF electrode on NF · Electrode

1.0 M KOH; Figure S17 LSV/EIS, Figure S21 Cdl; result rows specify individual samples in result names.

Geometry: MOF electrodes on NF
Context: quadruple-metal comparison controls
Measurement source: 14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figures S17 and S21

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CoFeZnMo-MOF Cdl	3.47 mF cm-2	—	—	Figure Axis Approximate	S23 · Supplementary Data · Figure S21
NiCoFeMo-MOF Cdl	3.22 mF cm-2	—	—	Figure Axis Approximate	S23 · Supplementary Data · Figure S21
NiCoFeZn-MOF Cdl	3.81 mF cm-2	—	—	Figure Axis Approximate	S23 · Supplementary Data · Figure S21
NiCoZnMo-MOF CdlMarked as a best value within this paper	4.16 mF cm-2	—	—	Figure Axis Approximate	S23 · Supplementary Data · Figure S21
NiFeZnMo-MOF Cdl	3.64 mF cm-2	—	—	Figure Axis Approximate	S23 · Supplementary Data · Figure S21
CoFeZnMo-MOF eta50 overpotential	294 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S17
NiCoFeMo-MOF eta50 overpotential	294 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S17
NiCoFeZn-MOF eta50 overpotential	340 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S17
NiCoZnMo-MOF eta50 overpotential	395 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S17
NiFeZnMo-MOF eta50 overpotentialMarked as a best value within this paper	265 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3d and Figure S17
NiFeZnMo-MOF Tafel slope	64 mV dec-1	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3b

OER LSV/EIS/Cdl comparison for single-metal MOFs

Impedance spectroscopy Voltammetry

Fe-MOF electrode on NF · Electrode

1.0 M KOH; Figure S14 LSV/EIS, Figure S18 Cdl; result rows specify individual samples in result names.

Geometry: MOF electrodes on NF
Context: single-metal comparison controls
Measurement source: 14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figures S14 and S18

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Co-MOF Cdl	4.28 mF cm-2	—	—	Figure Axis Approximate	S20 · Supplementary Data · Figure S18
Fe-MOF Cdl	4.09 mF cm-2	—	—	Figure Axis Approximate	S20 · Supplementary Data · Figure S18
Mo-MOF CdlMarked as a best value within this paper	9.21 mF cm-2	—	—	Figure Axis Approximate	S20 · Supplementary Data · Figure S18
Ni-MOF Cdl	4.57 mF cm-2	—	—	Figure Axis Approximate	S20 · Supplementary Data · Figure S18
Zn-MOF Cdl	4.89 mF cm-2	—	—	Figure Axis Approximate	S20 · Supplementary Data · Figure S18
Co-MOF eta50 overpotential	407 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S14
Fe-MOF eta50 overpotentialMarked as a best value within this paper	277 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3d and Figure S14
Mo-MOF eta50 overpotential	397 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S14
Ni-MOF eta50 overpotential	405 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S14
Zn-MOF eta50 overpotential	438 mV	—	—	Text Exact Reported	14098-14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S14
Fe-MOF Tafel slope	66 mV dec-1	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3b

OER LSV/EIS/Cdl comparison for triple-metal MOFs

Impedance spectroscopy Voltammetry

NiFeZn-MOF electrode on NF · Electrode

1.0 M KOH; Figure S16 LSV/EIS, Figure S20 Cdl; result rows specify individual samples in result names.

Geometry: MOF electrodes on NF
Context: triple-metal comparison controls
Measurement source: 14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figures S16 and S20

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
NiFeZn-MOF Tafel slope	68 mV dec-1	—	—	Text Exact Reported	14098 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3b
CoFeMo-MOF CdlMarked as a best value within this paper	8.65 mF cm-2	—	—	Figure Axis Approximate	S22 · Supplementary Data · Figure S20
NiCoFe-MOF Cdl	4.01 mF cm-2	—	—	Figure Axis Approximate	S22 · Supplementary Data · Figure S20
NiCoMo-MOF Cdl	8.03 mF cm-2	—	—	Figure Axis Approximate	S22 · Supplementary Data · Figure S20
NiFeMo-MOF Cdl	2.00 mF cm-2	—	—	Figure Axis Approximate	S22 · Supplementary Data · Figure S20
NiFeZn-MOF Cdl	1.77 mF cm-2	—	—	Figure Axis Approximate	S22 · Supplementary Data · Figure S20
CoFeMo-MOF eta50 overpotential	299 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S16
NiCoFe-MOF eta50 overpotential	340 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S16
NiCoMo-MOF eta50 overpotential	389 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S16
NiFeMo-MOF eta50 overpotential	333 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure S16
NiFeZn-MOF eta50 overpotentialMarked as a best value within this paper	289 mV	—	—	Text Exact Reported	14099 · 3.2 Electrochemical Oxygen Evolution Performance · Figure 3d and Figure S16