Electrical Transport — Extension of charge separation distance over isolated dual-metal sites in metal-organic frameworks for efficient CO2 photoreduction

3 measurement groups · 15 results

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

Electrochemical impedance spectroscopy (EIS) Nyquist plots

Impedance spectroscopy

CuCo-THQ coated FTO photoelectrode · Electrode

Three-electrode CHI 660E measurement; 0.5 M Na2SO4 electrolyte; bias potential -0.6 V, frequency range 1e-2 to 1e5 Hz.

Atmosphere: aqueous 0.5 M Na2SO4
Geometry: FTO-supported MOF/Nafion working electrode
Context: composite photoelectrode made from CuM-THQ powder
Measurement source: S2 / S34 · 1.1 Photo-electrochemical measurements · Fig. S36

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
EIS charge-transfer resistance trendMarked as a best value within this paper	CuCo-THQ exhibits the smallest semicircle radius	—	—	Qualitative Qualitative	p006 · 3.4 The investigation of the reaction mechanism · Fig. S36

Mott-Schottky plots for conduction-band positions

Mott-Schottky analysis

CuCo-THQ coated FTO photoelectrode · Electrode

Three-electrode CHI 660E measurement; potential range -0.8 to 1.0 V at constant frequency.

Atmosphere: aqueous 0.5 M Na2SO4
Geometry: FTO-supported MOF/Nafion working electrode
Context: Cu-THQ and CuM-THQ photoelectrodes
Measurement source: S2 / S34 · 1.1 Photo-electrochemical measurements · Fig. S43-S47

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CO/CO2 redox potential	-0.53 V	—	—	Text Exact Reported	p007 · 3.4 The investigation of the reaction mechanism · Fig. S47
Cu-THQ conduction band position	-0.86 eV vs NHE	—	—	Text Exact Reported	p007 · 3.4 The investigation of the reaction mechanism · Fig. S43-S46
Cu-THQ Mott-Schottky intercept vs Ag/AgCl	-0.96 V vs Ag/AgCl	—	—	Figure Axis Approximate	S26 / S34 · Supplementary Figures · Fig. S43
CuCo-THQ conduction band position	-0.70 eV vs NHE	—	—	Text Exact Reported	p007 · 3.4 The investigation of the reaction mechanism · Fig. S43-S47
CuCo-THQ Mott-Schottky intercept vs Ag/AgCl	-0.80 V vs Ag/AgCl	—	—	Figure Axis Approximate	S26 / S34 · Supplementary Figures · Fig. S44
CuFe-THQ conduction band position	-0.77 eV vs NHE	—	—	Text Exact Reported	p007 · 3.4 The investigation of the reaction mechanism · Fig. S43-S46
CuFe-THQ Mott-Schottky intercept vs Ag/AgCl	-0.87 V vs Ag/AgCl	—	—	Figure Axis Approximate	S27 / S34 · Supplementary Figures · Fig. S46
CuNi-THQ conduction band position	-0.76 eV vs NHE	—	—	Text Exact Reported	p007 · 3.4 The investigation of the reaction mechanism · Fig. S43-S46
CuNi-THQ Mott-Schottky intercept vs Ag/AgCl	-0.86 V vs Ag/AgCl	—	—	Figure Axis Approximate	S27 / S34 · Supplementary Figures · Fig. S45

Transient photocurrent response under chopped-light irradiation

Photoresponse and photoelectrochemistry

CuCo-THQ coated FTO photoelectrode · Electrode

Three-electrode system on CHI 660E; Pt counter, Ag/AgCl reference, photocatalyst-coated FTO working electrode; 0.5 M Na2SO4 electrolyte; chopped light at 0.5 V.

Atmosphere: aqueous 0.5 M Na2SO4
Geometry: FTO-supported MOF/Nafion working electrode
Context: composite photoelectrode made from CuM-THQ powder
Measurement source: S2 / S34 · 1.1 Photo-electrochemical measurements · Fig. 4b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu-THQ transient photocurrent plateau estimate	about 8 uA cm-2	—	visual estimate	Visual Estimate Approximate	p007 · 3.4 The investigation of the reaction mechanism · Fig. 4b
CuCo-THQ transient photocurrent plateau estimateMarked as a best value within this paper	about 42 uA cm-2	—	visual estimate	Visual Estimate Approximate	p007 · 3.4 The investigation of the reaction mechanism · Fig. 4b
CuFe-THQ transient photocurrent plateau estimate	about 15 uA cm-2	—	visual estimate	Visual Estimate Approximate	p007 · 3.4 The investigation of the reaction mechanism · Fig. 4b
CuNi-THQ transient photocurrent plateau estimate	about 25 uA cm-2	—	visual estimate	Visual Estimate Approximate	p007 · 3.4 The investigation of the reaction mechanism · Fig. 4b
Transient photocurrent density rankingMarked as a best value within this paper	Cu-THQ < CuFe-THQ < CuNi-THQ < CuCo-THQ	—	—	Text Qualitative	p006 · 3.4 The investigation of the reaction mechanism · Fig. 4b