Electrochemistry Application — Co 3 O 4 @Cu-Based Conductive Metal–Organic Framework Core–Shell Nanowire Electrocatalysts Enable Efficient Low-Overall-Potential Water Splitting

8 measurement groups · 37 results

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

Cyclic voltammetry double-layer capacitance

Voltammetry

Co3O4@CuCAT optimal core-shell electrode · Electrode

CV at scan rates 100-200 mV s-1; Cdl used to estimate ECSA.

Atmosphere: 1 M KOH / room temperature
Geometry: three-electrode CV
Context: composite target versus Co3O4
Measurement source: p008 · Supporting Information · Figure S11

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Co3O4 double-layer capacitance	1.4 mF cm-2	—	—	Text Exact Reported	p004 / journal p.6578 · Results · Figure S11d
Co3O4@CuCAT double-layer capacitanceMarked as a best value within this paper	6.6 mF cm-2	—	—	Text Exact Reported	p004 / journal p.6578 · Results · Figure S11d

Electrochemical impedance spectroscopy

Impedance spectroscopy

Co3O4@CuCAT optimal core-shell electrode · Electrode

Nyquist plots from 100000 Hz to 0.01 Hz with 5 mV amplitude.

Atmosphere: 1 M KOH / room temperature
Geometry: three-electrode EIS
Context: composite target versus CuCAT and Co3O4
Measurement source: p007 · Supporting Information · Figure S9

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Charge-transfer resistance ordering	CuCAT has smallest Rct; Co3O4@CuCAT Rct much smaller than Co3O4	—	—	Text Qualitative	p004 / journal p.6578 · Results · Figure S9

HER LSV and Tafel analysis

Voltammetry Tafel and polarisation analysis

Co3O4@CuCAT optimal core-shell electrode · Electrode

Three-electrode HER in 1 M KOH at room temperature; LSV scan rate 2 mV s-1; potentials -1.0 to -2.0 V vs Ag/AgCl, converted to RHE.

Atmosphere: 1 M KOH / room temperature
Geometry: working electrode on carbon cloth; carbon rod counter; Ag/AgCl reference
Context: target and controls
Measurement source: p007-p008 / journal pp.6581-6582 · Electrochemical measurements · Figure 3a,b; Table S2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Bare BCC HER activity	no HER activity observed	—	—	Text Qualitative	p004 / journal p.6578 · Results · Figure S12
HER overpotential at 10 mA cm-2 Co3O4	283 mV at 10 mA cm-2	10 mA cm-2	—	SI Table Exact Reported	p010 · Supporting Information · Table S2
HER overpotential at 10 mA cm-2 Co3O4@CuCATMarked as a best value within this paper	100 mV at 10 mA cm-2	10 mA cm-2	—	SI Table Exact Reported	p010 · Supporting Information · Table S2
HER overpotential at 10 mA cm-2 CuCAT	262 mV at 10 mA cm-2	10 mA cm-2	—	Text Exact Reported	p004 / journal p.6578 · Results · Figure 3a
HER onset overpotential Co3O4	200 mV	—	—	SI Table Exact Reported	p010 · Supporting Information · Table S2
HER onset overpotential Co3O4@CuCATMarked as a best value within this paper	30 mV	—	—	SI Table Exact Reported	p010 · Supporting Information · Table S2
HER onset overpotential CuCAT	176 mV	—	—	Text Exact Reported	p004 / journal p.6578 · Results · Figure 3a
HER onset overpotential Pt/C/CC	10 mV	—	—	Text Exact Reported	p004 / journal p.6578 · Results · Figure 3a
HER Tafel slope Co3O4	179 mV dec-1	—	—	SI Table Exact Reported	p010 · Supporting Information · Table S2
HER Tafel slope Co3O4@CuCATMarked as a best value within this paper	59 mV dec-1	—	—	SI Table Exact Reported	p010 · Supporting Information · Table S2
HER Tafel slope CuCAT	155 mV dec-1	—	—	Text Exact Reported	p004 / journal p.6578 · Results · Figure 3b
HER Tafel slope Pt/C/CC	37 mV dec-1	—	—	Text Exact Reported	p004 / journal p.6578 · Results · Figure 3b

HER amperometric i-t stability

Co3O4@CuCAT optimal core-shell electrode · Electrode

Constant overpotential -100 mV for 50 h in 1 M KOH; before/after LSV and EIS checked.

Atmosphere: 1 M KOH / room temperature
Geometry: three-electrode amperometry
Context: target sample
Measurement source: p004 / journal p.6578 · Results · Figure 3c; Figure S13

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
HER stability durationMarked as a best value within this paper	50 h at -100 mV overpotential	—	—	Text Exact Reported	p004 / journal p.6578 · Results · Figure 3c

OER LSV and Tafel analysis

Voltammetry Tafel and polarisation analysis

Co3O4@CuCAT optimal core-shell electrode · Electrode

Three-electrode OER in 1 M KOH at room temperature; LSV scan rate 2 mV s-1; potentials 0.0 to 1.0 V vs Ag/AgCl, converted to RHE.

Atmosphere: 1 M KOH / room temperature
Geometry: working electrode on carbon cloth; carbon rod counter; Ag/AgCl reference
Context: target and controls
Measurement source: p007-p008 / journal pp.6581-6582 · Electrochemical measurements · Figure 3d,e; Table S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Bare BCC OER performance	no OER performance observed	—	—	Text Qualitative	p005 / journal p.6579 · Results · Figure S16
OER overpotential at 10 mA cm-2 Co3O4	375 mV at 10 mA cm-2	10 mA cm-2	—	SI Table Exact Reported	p015 · Supporting Information · Table S3
OER overpotential at 10 mA cm-2 Co3O4@CuCATMarked as a best value within this paper	267 mV at 10 mA cm-2	10 mA cm-2	—	SI Table Exact Reported	p015 · Supporting Information · Table S3
OER overpotential at 10 mA cm-2 CuCAT	527 mV at 10 mA cm-2	10 mA cm-2	—	Text Exact Reported	p005 / journal p.6579 · Results · Figure 3d
OER overpotential at 10 mA cm-2 IrO2/CC	333 mV at 10 mA cm-2	10 mA cm-2	—	Text Exact Reported	p005 / journal p.6579 · Results · Figure 3d
OER onset overpotential Co3O4	315 mV	—	—	SI Table Exact Reported	p015 · Supporting Information · Table S3
OER onset overpotential Co3O4@CuCATMarked as a best value within this paper	200 mV	—	—	SI Table Exact Reported	p015 · Supporting Information · Table S3
OER onset overpotential CuCAT	418 mV	—	—	Text Exact Reported	p005 / journal p.6579 · Results · Figure 3d
OER onset overpotential IrO2/CC	263 mV	—	—	Text Exact Reported	p005 / journal p.6579 · Results · Figure 3d
OER Tafel slope Co3O4	84 mV dec-1	—	—	SI Table Exact Reported	p015 · Supporting Information · Table S3
OER Tafel slope Co3O4@CuCATMarked as a best value within this paper	75 mV dec-1	—	—	SI Table Exact Reported	p015 · Supporting Information · Table S3
OER Tafel slope CuCAT	109 mV dec-1	—	—	Text Exact Reported	p005 / journal p.6579 · Results · Figure 3e
OER Tafel slope IrO2/CC	83 mV dec-1	—	—	Text Exact Reported	p005 / journal p.6579 · Results · Figure 3e

OER amperometric i-t stability

Co3O4@CuCAT optimal core-shell electrode · Electrode

Constant overpotential 267 mV for 12 h in 1 M KOH; before/after LSV and EIS checked.

Atmosphere: 1 M KOH / room temperature
Geometry: three-electrode amperometry
Context: target sample
Measurement source: p005 / journal p.6579 · Results · Figure 3f; Figure S18

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER stability durationMarked as a best value within this paper	12 h at 267 mV overpotential	—	—	Text Exact Reported	p005 / journal p.6579 · Results · Figure 3f

Overall water splitting two-electrode LSV and stability

Voltammetry

Co3O4@CuCAT optimal core-shell electrode · Electrode

Two-electrode water splitting in 1 M KOH at 2 mV s-1 between 1.0 and 2.0 V; Co3O4@CuCAT used as both cathode and anode; 50 h i-t at 1.57 V.

Atmosphere: 1 M KOH / room temperature
Geometry: two-electrode electrolyser
Context: bifunctional target versus bifunctional Co3O4 and Pt/C/CC || IrO2/CC
Measurement source: p006-p008 / journal pp.6580-6582 · Results; Electrochemical measurements · Figure 6; Table 1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Overall water-splitting cell voltage at 10 mA cm-2 Co3O4@CuCATMarked as a best value within this paper	1.57 V at 10 mA cm-2	10 mA cm-2	—	Table Exact Reported	p007 / journal p.6581 · Table 1 · Table 1
Overall water-splitting cell voltage at 10 mA cm-2 bifunctional Co3O4	1.90 V	10 mA cm-2	—	Text Exact Reported	p006 / journal p.6580 · Results · Figure 6c
Electrode adhesion at high cell voltage	no obvious peeling detected at 1.8 V	—	—	Text Exact Reported	p006 / journal p.6580 · Results · Figure 6
Overall water-splitting onset voltage Co3O4@CuCATMarked as a best value within this paper	1.45 V	—	—	Table Exact Reported	p007 / journal p.6581 · Table 1 · Table 1
Overall water-splitting cell voltage at 10 mA cm-2 Pt/C/CC \|\| IrO2/CC	1.81 V	10 mA cm-2	—	Text Exact Reported	p006 / journal p.6580 · Results · Figure 6c
Two-electrode stability durationMarked as a best value within this paper	50 h at fixed potential 1.57 V	—	—	Table Exact Reported	p007 / journal p.6581 · Table 1 · Table 1

HER/OER LSV ratio-series comparison

Voltammetry

Co3O4@CuCAT-1 · Electrode

HER and OER LSV curves of Co3O4@CuCAT samples with different CuCAT coating ratios.

Atmosphere: 1 M KOH
Geometry: three-electrode LSV
Context: ratio variants versus optimum/control
Measurement source: p021 · Supporting Information · Figure S23

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ratio series best sampleMarked as a best value within this paper	optimal Co3O4@CuCAT showed best catalytic activity; Co3O4@CuCAT-1 and -2 better than Co3O4; excess CuCAT poorer	—	—	Text Qualitative	p005 / journal p.6579 · Results · Figure S23