Electrochemistry Application — Trimetallic conductive metal-organic frameworks as precatalysts for the oxygen evolution reaction with enhanced activity

17 measurement groups · 64 results

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

Double-layer capacitance from CV

Voltammetry

FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) about 0.32 · Electrode

CV at 20, 30, 40, 50, and 60 mV s^-1 in a non-Faradaic region; Cdl from slope of deltaJ vs scan rate.

Atmosphere: alkaline electrolyte
Geometry: GC electrode
Context: activated M-CAT electrodes
Measurement source: S-10 · Supporting Information · Figure S13

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Double-layer capacitance range	2.4-2.5 mF cm^-2	—	—	Text Range	6 · Results and discussion · Fig. S12 and S13 cited
Double-layer capacitance Cdl for Co-CAT	2.5 mF cm^-2 (read from Figure S13 label)	—	—	Figure Axis Approximate	S-10 · Supporting Information · Figure S13
Double-layer capacitance Cdl for Co0.6Ni0.4-CAT	2.495 mF cm^-2 (read from Figure S13 label)	—	—	Figure Axis Approximate	S-10 · Supporting Information · Figure S13
Double-layer capacitance Cdl for FeCo0.6Ni0.4-CATMarked as a best value within this paper	2.545 mF cm^-2 (read from Figure S13 label)	—	—	Figure Axis Approximate	S-10 · Supporting Information · Figure S13
Double-layer capacitance Cdl for Ni-CAT	2.5 mF cm^-2 (read from Figure S13 label)	—	—	Figure Axis Approximate	S-10 · Supporting Information · Figure S13

CV redox behaviour

Voltammetry

FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) about 0.32 · Electrode

CV curves from 0.924-1.624 V vs RHE at 10 mV s^-1 for FeCo0.6Ni0.4-CAT, FeNi-CAT, Co0.6Ni0.4-CAT, and Ni-CAT.

Atmosphere: alkaline electrolyte
Geometry: GC electrode
Context: activated M-CAT electrodes
Measurement source: 7 · Results and discussion · Fig. 5b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni2+/Ni3+ oxidation peak potential	1.377 V vs RHE	—	—	Text Exact Reported	7 · Results and discussion · Fig. 5b
Co2+/Co3+ oxidation signal onset	starting at 1.05 V vs RHE	—	—	Text Rounded Reported	7 · Results and discussion · Fig. S15 cited
Ni2+/Ni3+ oxidation peak potential	1.41 V vs RHE	—	—	Text Rounded Reported	7 · Results and discussion · Fig. 5b
Ni2+/Ni3+ peak intensity decrease	82.2% decrease	—	—	Text Exact Reported	7 · Results and discussion · Fig. 5b
Ni2+/Ni3+ oxidation peak potential	1.435 V vs RHE	—	—	Text Exact Reported	7 · Results and discussion · Fig. 5b
Ni2+/Ni3+ oxidation peak potential	1.428 V vs RHE	—	—	Text Exact Reported	7 · Results and discussion · Fig. 5b

Accelerated CV cycling and chronopotentiometry

Voltammetry Galvanostatic cycling

FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) about 0.32 · Electrode

CV durability from 1.124-1.574 V vs RHE at 5 mV s^-1; chronopotentiometry at 10 mA cm^-2 for 30 h.

Atmosphere: O2/alkaline OER
Geometry: GC electrode
Context: trimetallic conductive MOF precatalyst after activation
Measurement source: 5 · Results and discussion · Fig. 3e-f

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Applied potential increase after 30 h chronopotentiometry	1.3% increase after 30 h at 10 mA cm^-2	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3f
Overpotential increase after 1000 CV cycles	0.2% increase	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3e

EIS/Nyquist plot

Impedance spectroscopy

FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) about 0.32 · Electrode

EIS from 10^-1 to 10^6 Hz at 1.63 V vs RHE under OER-relevant conditions; charge-transfer resistance Rct extracted.

Atmosphere: alkaline OER
Geometry: GC electrode
Context: activated M-CAT electrodes
Measurement source: S-12 · Supporting Information · Table S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
EIS fitted Rct for Co0.6Ni0.4-CAT	51.1 ohm	—	1.6 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Ri for Co0.6Ni0.4-CAT	13.7 ohm	—	1.74 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rs for Co0.6Ni0.4-CAT	1.9 ohm	—	8.4 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rct for Co-CAT	149.1 ohm	—	0.7 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Ri for Co-CAT	16.9 ohm	—	1 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rs for Co-CAT	2.3 ohm	—	4.5 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rct for FeCo0.6Ni0.4-CATMarked as a best value within this paper	3.2 ohm	—	1.3 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Ri for FeCo0.6Ni0.4-CAT	11.1 ohm	—	0.3 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rs for FeCo0.6Ni0.4-CAT	2.6 ohm	—	0.9 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rct for FeCo-CAT	9.6 ohm	—	0.6 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Ri for FeCo-CAT	13.4 ohm	—	0.5 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rs for FeCo-CAT	2.8 ohm	—	1.7 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rct for FeNi-CAT	30.6 ohm	—	0.7 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Ri for FeNi-CAT	12.4 ohm	—	1.5 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rs for FeNi-CAT	3.1 ohm	—	2.5 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rct for Ni-CAT	81.9 ohm	—	1.7 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Ri for Ni-CAT	8.9 ohm	—	4 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rp for Ni-CAT	49.7 ohm	—	1.5 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
EIS fitted Rs for Ni-CAT	2.6 ohm	—	4 % fit error	SI Table Exact Reported	S-12 · Supporting Information · Table S3
Charge-transfer resistance Rct	149.1 ohm	—	—	SI Table Exact Reported	S-12 · Supporting Information · Table S3
Charge-transfer resistance Rct	51.1 ohm	—	—	SI Table Exact Reported	S-12 · Supporting Information · Table S3
Charge-transfer resistance Rct	9.6 ohm	—	—	SI Table Exact Reported	S-12 · Supporting Information · Table S3
Charge-transfer resistance RctMarked as a best value within this paper	3.2 ohm	—	—	SI Table Exact Reported	S-12 · Supporting Information · Table S3
Charge-transfer resistance Rct	30.6 ohm	—	—	SI Table Exact Reported	S-12 · Supporting Information · Table S3
Charge-transfer resistance Rct	81.9 ohm	—	—	SI Table Exact Reported	S-12 · Supporting Information · Table S3

LSV/CV/chronopotentiometry/EIS in three-electrode OER cell

Impedance spectroscopy Voltammetry Galvanostatic cycling

FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) about 0.32 · Electrode

CHI 660E; GC working electrode, Hg/HgO reference, Pt wire counter; O2-saturated 1.0 M KOH; 0.2 mg cm^-2 catalyst; 20 CV activation cycles before measurements; RHE conversion used.

Atmosphere: O2-purged alkaline electrolyte
Geometry: 3 mm diameter GC electrode
Context: conductive MOF precatalyst electrode
Measurement source: 3 · Electrochemical measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source

LSV

Voltammetry

Co-CAT powder/electrode · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: monometallic conductive MOF control
Measurement source: 4 · Results and discussion · Fig. 3a

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Current density at 1.6 V vs RHE	1.5 mA cm^-2	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3b
OER overpotential at 10 mA cm^-2	435 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3a

LSV

Voltammetry

Co0.4Ni0.6-CAT powder/electrode · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: bimetallic conductive MOF control
Measurement source: 4 · Results and discussion · Fig. 3a

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER overpotential at 10 mA cm^-2	443 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3a

LSV

Voltammetry

Co0.6Ni0.4-CAT powder/electrode · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2 and current density at 1.6 V vs RHE.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: bimetallic conductive MOF control
Measurement source: 4 · Results and discussion · Fig. 3a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Current density at 1.6 V vs RHE	4.7 mA cm^-2	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3b
OER overpotential at 10 mA cm^-2	398 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3a

LSV

Voltammetry

Co0.8Ni0.2-CAT powder/electrode · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: bimetallic conductive MOF control
Measurement source: 4 · Results and discussion · Fig. 3a

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER overpotential at 10 mA cm^-2	425 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3a

LSV

Voltammetry

FeCo-CAT powder/electrode · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: Fe-exchanged conductive MOF precatalyst
Measurement source: 4 · Results and discussion · Fig. S6 and S7 cited

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER overpotential at 10 mA cm^-2	308 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. S6 and S7 cited

LSV

Voltammetry

FeCo0.4Ni0.6-CAT powder/electrode · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: trimetallic conductive MOF precatalyst
Measurement source: 4 · Results and discussion · Fig. S6 and S7 cited

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER overpotential at 10 mA cm^-2	281 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. S6 and S7 cited

LSV

Voltammetry

FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) about 0.32 · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2 and current density at 1.6 V vs RHE.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: trimetallic conductive MOF precatalyst
Measurement source: 4 · Results and discussion · Fig. 3a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Current density at 1.6 V vs RHEMarked as a best value within this paper	72 mA cm^-2	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3b
OER overpotential at 10 mA cm^-2Marked as a best value within this paper	277 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3a-b

LSV

Voltammetry

FeCo0.8Ni0.2-CAT powder/electrode · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: trimetallic conductive MOF precatalyst
Measurement source: 4 · Results and discussion · Fig. S6 and S7 cited

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER overpotential at 10 mA cm^-2	282 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. S6 and S7 cited

LSV

Voltammetry

FeNi-CAT powder/electrode · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: Fe-exchanged conductive MOF precatalyst
Measurement source: 4 · Results and discussion · Fig. S6 and S7 cited

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER overpotential at 10 mA cm^-2	327 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. S6 and S7 cited

LSV

Voltammetry

Ni-CAT powder/electrode · Electrode

O2-saturated 1.0 M KOH, 5 mV s^-1, iR-corrected; overpotential at 10 mA cm^-2.

Atmosphere: O2
Geometry: GC electrode, 0.2 mg cm^-2 catalyst
Context: monometallic conductive MOF control
Measurement source: 4 · Results and discussion · Fig. 3a

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Current density at 1.6 V vs RHE	4.4 mA cm^-2	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3b
OER overpotential at 10 mA cm^-2	425 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3a

LSV

Voltammetry

Commercial RuO2 benchmark electrode · Electrode

Commercial RuO2 comparison under same OER conditions.

Atmosphere: O2
Geometry: GC electrode
Context: non-MOF benchmark
Measurement source: 4 · Results and discussion · Fig. 3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Current density at 1.6 V vs RHE	43.9 mA cm^-2	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3b
OER overpotential at 10 mA cm^-2	289 mV	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3b

TOF calculation and Tafel analysis

Tafel and polarisation analysis

FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) about 0.32 · Electrode

TOF calculated at 1.63 V vs RHE using J*A/(4*n*F); Tafel plots from OER polarisation curves.

Atmosphere: O2
Geometry: GC electrode; geometric area 0.0707 cm2
Context: activated OER electrodes
Measurement source: 3 · Electrochemical measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Tafel slope	83.3 mV dec^-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3d
Tafel slope	77.2 mV dec^-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3d
Tafel slopeMarked as a best value within this paper	44.7 mV dec^-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3d
Tafel slope	123.4 mV dec^-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3d
Tafel slope	58.7 mV dec^-1	—	—	Figure Axis Rounded Reported	5 · Figure · Fig. 3d
TOF at 1.63 V vs RHE	0.0048 s^-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3c
TOF at 1.63 V vs RHE	0.0149 s^-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3c
TOF at 1.63 V vs RHEMarked as a best value within this paper	0.2276 s^-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3c
TOF at 1.63 V vs RHE	0.0139 s^-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3c
TOF at 1.63 V vs RHE	0.0755 s^-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3c