Electrochemistry Application

Cu1Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

1.0 M NaOH + 0.1 M NaNO3, potentials 0 to -0.3 V

Measurement source: 5 · 3.2 · Figures S23-S24

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu1Co1HHTP alkaline optimal FE at -0.2 V	78.3%	—	—	Text Exact Reported	5 · 3.2 · Figures S23-S24
Cu1Co1HHTP alkaline FE at -0.3 V	60.8%	—	—	Text Exact Reported	5 · 3.2 · Figures S23-S24
Cu1Co1HHTP alkaline NH3 yield rate at -0.3 V	288.2 umol cm-2	—	—	Text Exact Reported	5 · 3.2 · Figures S23-S24

chronoamperometry NO3RR product analysis

CoHHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3 at -0.6 V vs RHE; NH3/NO2 yield and FE

Measurement source: 4-5 · 3.2 · Fig. 4c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CoHHTP NH3 Faradaic efficiency at -0.6 V	about 75%	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c
CoHHTP NH3 yield rate at -0.6 V	about 20 umol h-1 cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c
CoHHTP NO2- yield rate at -0.6 V	about 40 umol h-1 cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c

chronoamperometry NO3RR product analysis

Cu1Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3 at -0.6 V vs RHE; NH3/NO2 yield and FE

Measurement source: 4-5 · 3.2 · Fig. 4c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu1Co1HHTP NH3 Faradaic efficiency at -0.6 VMarked as a best value within this paper	96.4%	—	—	Text Exact Reported	5 · 3.2 · Fig. 4c
Cu1Co1HHTP NH3 yield rate at -0.6 VMarked as a best value within this paper	299.9 umol h-1 cm-2	—	—	Text Exact Reported	5 · 3.2 · Fig. 4c
Cu1Co1HHTP NO2- yield rate at -0.6 V	about 45 umol h-1 cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c

chronoamperometry NO3RR product analysis

Cu1Co2HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3 at -0.6 V vs RHE; NH3/NO2 yield and FE

Measurement source: 4-5 · 3.2 · Fig. 4c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu1Co2HHTP NH3 Faradaic efficiency at -0.6 V	about 88%	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c
Cu1Co2HHTP NH3 yield rate at -0.6 V	about 185 umol h-1 cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c
Cu1Co2HHTP NO2- yield rate at -0.6 V	about 45 umol h-1 cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c

chronoamperometry NO3RR product analysis

Cu2Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3 at -0.6 V vs RHE; NH3/NO2 yield and FE

Measurement source: 4-5 · 3.2 · Fig. 4c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu2Co1HHTP NH3 Faradaic efficiency at -0.6 V	about 75%	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c
Cu2Co1HHTP NH3 yield rate at -0.6 V	about 160 umol h-1 cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c
Cu2Co1HHTP NO2- yield rate at -0.6 V	about 135 umol h-1 cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c

chronoamperometry NO3RR product analysis

CuHHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3 at -0.6 V vs RHE; NH3/NO2 yield and FE

Measurement source: 4-5 · 3.2 · Fig. 4c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CuHHTP NH3 Faradaic efficiency at -0.6 V	about 52%	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c
CuHHTP NH3 yield rate at -0.6 V	about 60 umol h-1 cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c
CuHHTP NO2- yield rate at -0.6 V	about 220 umol h-1 cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4c

cyclic voltammetry double-layer capacitance

CoHHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Non-Faradaic CV at 20, 40, 60, 80 and 100 mV s-1; Cdl as ECSA proxy

Measurement source: 5-6 · 3.2 · Fig. 5d/Figures S27-S31

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
co hhtp double-layer capacitance	1.19 mF cm-2	—	—	Figure Axis Rounded Reported	5-6 · 3.2 · Fig. 5d

cyclic voltammetry double-layer capacitance

Cu1Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Non-Faradaic CV at 20, 40, 60, 80 and 100 mV s-1; Cdl as ECSA proxy

Measurement source: 5-6 · 3.2 · Fig. 5d/Figures S27-S31

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
cu1co1 hhtp double-layer capacitanceMarked as a best value within this paper	6.54 mF cm-2	—	—	Text Exact Reported	5-6 · 3.2 · Fig. 5d

cyclic voltammetry double-layer capacitance

Cu1Co2HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Non-Faradaic CV at 20, 40, 60, 80 and 100 mV s-1; Cdl as ECSA proxy

Measurement source: 5-6 · 3.2 · Fig. 5d/Figures S27-S31

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
cu1co2 hhtp double-layer capacitance	2.97 mF cm-2	—	—	Figure Axis Rounded Reported	5-6 · 3.2 · Fig. 5d

cyclic voltammetry double-layer capacitance

Cu2Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Non-Faradaic CV at 20, 40, 60, 80 and 100 mV s-1; Cdl as ECSA proxy

Measurement source: 5-6 · 3.2 · Fig. 5d/Figures S27-S31

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
cu2co1 hhtp double-layer capacitance	5.7 mF cm-2	—	—	Figure Axis Rounded Reported	5-6 · 3.2 · Fig. 5d

cyclic voltammetry double-layer capacitance

CuHHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Non-Faradaic CV at 20, 40, 60, 80 and 100 mV s-1; Cdl as ECSA proxy

Measurement source: 5-6 · 3.2 · Fig. 5d/Figures S27-S31

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
cu hhtp double-layer capacitance	3.82 mF cm-2	—	—	Figure Axis Rounded Reported	5-6 · 3.2 · Fig. 5d

electrochemical impedance spectroscopy

CoHHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Nyquist plot and equivalent circuit under NO3RR conditions

Measurement source: 5-6 · 3.2 · Fig. 5c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
co hhtp charge-transfer resistance	7.5 kOhm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5c

electrochemical impedance spectroscopy

Cu1Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Nyquist plot and equivalent circuit under NO3RR conditions

Measurement source: 5-6 · 3.2 · Fig. 5c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
cu1co1 hhtp charge-transfer resistanceMarked as a best value within this paper	0.9 kOhm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5c

electrochemical impedance spectroscopy

Cu1Co2HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Nyquist plot and equivalent circuit under NO3RR conditions

Measurement source: 5-6 · 3.2 · Fig. 5c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
cu1co2 hhtp charge-transfer resistance	1.5 kOhm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5c

electrochemical impedance spectroscopy

Cu2Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Nyquist plot and equivalent circuit under NO3RR conditions

Measurement source: 5-6 · 3.2 · Fig. 5c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
cu2co1 hhtp charge-transfer resistance	1.1 kOhm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5c

electrochemical impedance spectroscopy

CuHHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Nyquist plot and equivalent circuit under NO3RR conditions

Measurement source: 5-6 · 3.2 · Fig. 5c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
cu hhtp charge-transfer resistance	3.2 kOhm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5c

15N isotope labelling and product-control tests

Cu1Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

Na15NO3/Na14NO3 NMR; no-nitrate, OCP, and hydrazine controls

Measurement source: 5-6 · 3.2 · Fig. 5a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu1Co1HHTP hydrazine yield after NO3RR	0.4 umol h-1 cm-2	—	—	Text Exact Reported	5 · 3.2 · Fig. 5b
Cu1Co1HHTP NH3 at open circuit potential	trace ammonia	—	—	Text Qualitative	5 · 3.2 · Fig. 5b
Cu1Co1HHTP NH3 yield without NaNO3 at -0.6 V	1.65 umol h-1 cm-2	—	—	Text Exact Reported	5 · 3.2 · Fig. 5b
14NH4+ NMR peak 1	6.98 ppm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5a
14NH4+ NMR peak 2	7.11 ppm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5a
14NH4+ NMR peak 3	7.24 ppm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5a
15NH4+ NMR peak high	7.19 ppm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5a
15NH4+ NMR peak low	7.01 ppm	—	—	Text Exact Reported	5 · 3.2 · Fig. 5a
independent product-detection replicate count	three independent experiments	—	—	Text Exact Reported	1.3 Product Detection

linear sweep voltammetry

CoHHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3, potentials vs RHE; comparison of catalytic current

Measurement source: 4 · 3.2 · Fig. 4a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CoHHTP LSV current density near -0.6 V	about -15 mA cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4b

linear sweep voltammetry

Cu1Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3, potentials vs RHE; comparison of catalytic current

Measurement source: 4 · 3.2 · Fig. 4a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu1Co1HHTP LSV current density near -0.6 VMarked as a best value within this paper	about -82 mA cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4b

linear sweep voltammetry

Cu1Co2HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3, potentials vs RHE; comparison of catalytic current

Measurement source: 4 · 3.2 · Fig. 4a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu1Co2HHTP LSV current density near -0.6 V	about -40 mA cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4b

linear sweep voltammetry

Cu2Co1HHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3, potentials vs RHE; comparison of catalytic current

Measurement source: 4 · 3.2 · Fig. 4a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu2Co1HHTP LSV current density near -0.6 V	about -60 mA cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4b

linear sweep voltammetry

CuHHTP/SCCB/Nafion on carbon cloth electrode · Electrode

0.5 M Na2SO4 + 0.1 M NaNO3, potentials vs RHE; comparison of catalytic current

Measurement source: 4 · 3.2 · Fig. 4a-b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CuHHTP LSV current density near -0.6 V	about -34 mA cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4b
CuHHTP current density without nitrate near -0.6 V	about -10 mA cm-2	—	—	Visual Estimate Approximate	4 · 3.2 · Fig. 4a

chronoamperometry potential series