Electrochemistry Application — Nanostructured CuO/C Hollow Shell@3D Copper Dendrites as a Highly Efficient Electrocatalyst for Oxygen Evolution Reaction

Measurement evidence

Electrochemistry Application

Nanostructured CuO/C Hollow Shell@3D Copper Dendrites as a Highly Efficient Electrocatalyst for Oxygen Evolution Reaction · Zhang B., Li C., Yang G. et al. · ACS Applied Materials and Interfaces · 2018 · 23807-23812

13 measurement groups · 24 results

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

Cyclic voltammetry double-layer capacitance

HS-CuO/C NDs electrode · Electrode

CV in non-Faradaic region 1.185-1.315 V vs RHE in 1.0 M KOH at scan rates 1, 2, 5, 10, 15, and 20 mV s-1.

Temperature: 298
Geometry: Three-electrode ND working electrode
Context: Target MOF-derived composite
Measurement source: S-4 and S-11 · 3. Electrochemical measurement · Figure S11

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
double-layer capacitance CdlMarked as a best value within this paper	173.2 mF cm-2	—	—	Text Exact Reported	p004 / 23810 · Results and Discussion · Figure S11

Cyclic voltammetry double-layer capacitance

PS-CuO/C NDs electrode · Electrode

CV in non-Faradaic region 1.185-1.315 V vs RHE in 1.0 M KOH at scan rates 1, 2, 5, 10, 15, and 20 mV s-1.

Temperature: 298
Geometry: Three-electrode ND working electrode
Context: Carbon-containing comparison sample
Measurement source: S-11 · Figure caption · Figure S11

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
double-layer capacitance Cdl	128.6 mF cm-2	—	—	Text Exact Reported	p004 / 23810 · Results and Discussion · Figure S11

Electrochemical impedance spectroscopy (Nyquist plot)

Impedance spectroscopy

HS-CuO/C NDs electrode · Electrode

EIS spectra of ND electrodes in OER electrolyte; charge-transfer resistance from high-frequency semicircle.

Temperature: 298
Geometry: Three-electrode ND working electrode
Context: Target MOF-derived composite
Measurement source: p004-p005 / 23810-23811 · Results and Discussion · Figure 4d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
charge-transfer resistance RctMarked as a best value within this paper	~2.6 ohm	—	—	Text Approximate	p004-p005 / 23810-23811 · Results and Discussion · Figure 4d

Electrochemical impedance spectroscopy (Nyquist plot)

Impedance spectroscopy

PS-CuO NDs electrode · Electrode

EIS spectra of ND electrodes in OER electrolyte.

Temperature: 298
Geometry: Three-electrode ND working electrode
Context: Carbon-free porous shell control
Measurement source: p004-p005 / 23810-23811 · Results and Discussion · Figure 4d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
charge-transfer resistance Rct	5.7 ohm	—	—	Text Rounded Reported	p004-p005 / 23810-23811 · Results and Discussion · Figure 4d

Electrochemical impedance spectroscopy (Nyquist plot)

Impedance spectroscopy

PS-CuO/C NDs electrode · Electrode

EIS spectra of ND electrodes in OER electrolyte.

Temperature: 298
Geometry: Three-electrode ND working electrode
Context: Carbon-containing comparison sample
Measurement source: p004-p005 / 23810-23811 · Results and Discussion · Figure 4d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
charge-transfer resistance Rct	3.5 ohm	—	—	Text Rounded Reported	p004-p005 / 23810-23811 · Results and Discussion · Figure 4d

LSV and Tafel analysis

Voltammetry Tafel and polarisation analysis

annealed NDs electrode · Electrode

OER in 1.0 M KOH at 5 mV s-1; three-electrode system at room temperature, potentials converted to RHE.

Temperature: 298
Geometry: Annealed NDs electrode as working electrode
Context: Annealed non-MOF control
Measurement source: p004 / 23810 · Results and Discussion · Figure 4a-c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
overpotential at 10 mA cm-2	337 mV	—	—	Figure Axis Approximate	p004 / 23810 · Figure 4 · Figure 4b
overpotential at 100 mA cm-2	572 mV	—	—	Figure Axis Approximate	p004 / 23810 · Figure 4 · Figure 4b
Tafel slope	97.5 mV dec-1	—	—	Figure Axis Approximate	p004 / 23810 · Figure 4 · Figure 4c

LSV and Tafel analysis

Voltammetry Tafel and polarisation analysis

as-prepared Cu2O-Cu NDs electrode · Electrode

OER in 1.0 M KOH at 5 mV s-1; three-electrode system at room temperature, potentials converted to RHE.

Temperature: 298
Geometry: NDs electrode as working electrode, Pt counter, Ag/AgCl reference
Context: Untreated Cu2O-Cu control
Measurement source: p003-p004 / 23809-23810 · Results and Discussion · Figure 4a,c; Figure S8

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
overpotential at 10 mA cm-2	~400 mV	—	—	Text Approximate	p003 / 23809 · Results and Discussion · Figure 4a
Tafel slope	~212.1 mV dec-1	—	—	Figure Axis Approximate	p004 / 23810 · Figure 4 · Figure 4c

LSV and Tafel analysis

Voltammetry Tafel and polarisation analysis

HS-CuO/C NDs electrode · Electrode

OER in 1.0 M KOH at 5 mV s-1; three-electrode system at room temperature, potentials converted to RHE.

Temperature: 298
Geometry: HS-CuO/C NDs electrode as working electrode, Pt counter, Ag/AgCl reference
Context: Target MOF-derived composite
Measurement source: p003-p004 / 23809-23810 · Results and Discussion · Figure 4a-c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
overpotential at 10 mA cm-2Marked as a best value within this paper	286 mV	—	—	Text Exact Reported	p003 / 23809 · Results and Discussion · Figure 4b; Table S1
overpotential at 100 mA cm-2Marked as a best value within this paper	482 mV	—	—	Text Exact Reported	p003 / 23809 · Results and Discussion · Figure 4b
Tafel slopeMarked as a best value within this paper	66.3 mV dec-1	—	—	Text Exact Reported	p004 / 23810 · Results and Discussion · Figure 4c; Table S1

LSV and Tafel analysis

Voltammetry Tafel and polarisation analysis

PS-CuO NDs electrode · Electrode

OER in 1.0 M KOH at 5 mV s-1; three-electrode system at room temperature, potentials converted to RHE.

Temperature: 298
Geometry: PS-CuO NDs electrode as working electrode
Context: Carbon-free porous shell control
Measurement source: p004 / 23810 · Results and Discussion · Figure 4a-c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
overpotential at 10 mA cm-2	323 mV	—	—	Calculated From Reported Rounded Reported	p003 / 23809 · Results and Discussion · Figure 4b
overpotential at 100 mA cm-2	557 mV	—	—	Figure Axis Approximate	p004 / 23810 · Figure 4 · Figure 4b
Tafel slope	87.5 mV dec-1	—	—	Figure Axis Approximate	p004 / 23810 · Figure 4 · Figure 4c

LSV and Tafel analysis

Voltammetry Tafel and polarisation analysis

PS-CuO/C NDs electrode · Electrode

OER in 1.0 M KOH at 5 mV s-1; three-electrode system at room temperature, potentials converted to RHE.

Temperature: 298
Geometry: PS-CuO/C NDs electrode as working electrode
Context: Carbon-containing comparison sample
Measurement source: p003-p004 / 23809-23810 · Results and Discussion · Figure 4a-c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
overpotential at 10 mA cm-2	308 mV	—	—	Text Exact Reported	p003 / 23809 · Results and Discussion · Figure 4b; Table S1
overpotential at 100 mA cm-2	523 mV	—	—	Figure Axis Approximate	p004 / 23810 · Figure 4 · Figure 4b
Tafel slope	75.9 mV dec-1	—	—	SI Table Exact Reported	S-13 · Table S1 · Table S1

Chronopotentiometry stability test with post-test SEM, EDX and XRD

X-ray diffraction and scattering Scanning electron microscopy Elemental microanalysis and mapping Galvanostatic cycling

HS-CuO/C NDs electrode · Electrode

1.0 M KOH at 10 mA cm-2 for 50 h.

Temperature: 298
Geometry: Three-electrode ND working electrode
Context: Target MOF-derived composite
Measurement source: p005 / 23811 · Results and Discussion · Figure 5; Figure S13

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
long-term stability responseMarked as a best value within this paper	slight increase in potential; morphology remains intact after 50 h	—	—	Text Qualitative	p005 / 23811 · Results and Discussion · Figure 5; Figure S13
chronopotentiometry current density	10 mA cm-2	—	—	Text Exact Reported	p005 / 23811 · Results and Discussion · Figure 5
chronopotentiometry duration	50 h	—	—	Text Exact Reported	p005 / 23811 · Results and Discussion · Figure 5

Chronopotentiometry stability test

Galvanostatic cycling

PS-CuO NDs electrode · Electrode

1.0 M KOH at 10 mA cm-2 for 50 h.

Temperature: 298
Geometry: Three-electrode ND working electrode
Context: Carbon-free porous shell control
Measurement source: p005 / 23811 · Results and Discussion · Figure 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
potential rise during stability test	>200 mV	—	—	Text Range	p005 / 23811 · Results and Discussion · Figure 5

Chronopotentiometry stability test

Galvanostatic cycling

PS-CuO/C NDs electrode · Electrode

1.0 M KOH at 10 mA cm-2 for 50 h.

Temperature: 298
Geometry: Three-electrode ND working electrode
Context: Carbon-containing comparison sample
Measurement source: p005 / 23811 · Results and Discussion · Figure 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
long-term stability response	slight increase in potential over 50 h	—	—	Text Qualitative	p005 / 23811 · Results and Discussion · Figure 5