Electrochemistry Application — Two-Dimensional Conductive Ni-HAB as a Catalyst for the Electrochemical Oxygen Reduction Reaction

7 measurement groups · 12 results

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

electrochemical capacitance-derived ECSA

Ni-HAB-H drop-cast GC electrode · Electrode

Potential swept between 0.10 and 0.30 V vs RHE five times at scan rates 10-300 mV/s; capacitive current measured at 0.20 V vs RHE; flat-surface capacitance standard 40 uF/cm2.

Geometry: drop-cast catalyst film on GC electrode
Context: catalyst/Nafion electrode
Measurement source: S2 · Section 1. Electrochemical active surface area · Figure S1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
linear-fit specific capacitance used for ECSA	~250 uF cm-2	—	—	Text Approximate	S2 · Section 1. Electrochemical active surface area · Figure S1
ECSA of Ni-HAB-HMarked as a best value within this paper	8.1 m2/g	—	—	Caption Exact Reported	S2 · Figure caption · Figure S1

electrochemical capacitance-derived ECSA

Ni-HAB-L drop-cast GC electrode · Electrode

Potential swept between 0.10 and 0.30 V vs RHE five times at scan rates 10-300 mV/s; capacitive current measured at 0.20 V vs RHE; flat-surface capacitance standard 40 uF/cm2.

Geometry: drop-cast catalyst film on GC electrode
Context: catalyst/Nafion electrode
Measurement source: S2 · Section 1. Electrochemical active surface area · Figure S1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ECSA of Ni-HAB-L	5.1 m2/g	—	—	Caption Exact Reported	S2 · Figure caption · Figure S1

RRDE ORR voltammetry

Voltammetry

Cu-HAB drop-cast GC electrode · Electrode

Disk swept 0.2-1.1 V vs RHE at 10 mV/s; Pt ring held at 1.2 V vs RHE to oxidise H2O2; Cu-HAB prepared by ink drop-casting.

Atmosphere: alkaline ORR electrolyte
Geometry: drop-cast catalyst film on RRDE
Context: catalyst/Nafion electrode
Measurement source: S3-S4 · Section 3. RRDE measurement for Cu-HAB · Figure S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu-HAB irreversible current potential	around 0.3 V vs RHE	—	—	Text Approximate	39076 · Results and Discussion · Figure S3
full 4e- ORR mass-transport-limited current benchmark	about 6 mA/cm2	—	—	Text Approximate	39076 · Results and Discussion · Figure S3

RRDE/RDE ORR voltammetry

Voltammetry

Ni-HAB-H drop-cast GC electrode · Electrode

0.1 M KOH in water, pH 13, RRDE at 1600 rpm; disk potential swept 0.2-1.1 V vs RHE at 10 mV/s; Pt ring held at 1.2 V vs RHE; O2 current corrected by subtracting N2 current.

Atmosphere: alkaline electrolyte, O2/N2 comparison
Geometry: drop-cast catalyst film on GC RRDE/RDE
Context: catalyst/Nafion electrode
Measurement source: 39076; 39079 · ORR Activity of Ni-HAB-H and Ni-HAB-L; Electrochemical Characterizations · Figure 3a,d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-HAB-H H2O2 selectivity	around 50%	—	—	Text Approximate	39077 · ORR Activity of Ni-HAB-H and Ni-HAB-L · Figure 3d
Ni-HAB-H potential reaching mass-transport-limited currentMarked as a best value within this paper	0.7 V vs RHE	—	—	Text Rounded Reported	39076 · ORR Activity of Ni-HAB-H and Ni-HAB-L · Figure 3a
Ni-HAB-H ORR onset potentialMarked as a best value within this paper	0.8 V vs RHE	—	—	Text Rounded Reported	39075-39076 · Results and Discussion; ORR Activity · Figure 3a

RRDE/RDE ORR voltammetry

Voltammetry

Ni-HAB-L drop-cast GC electrode · Electrode

0.1 M KOH in water, pH 13, RRDE at 1600 rpm; disk potential swept 0.2-1.1 V vs RHE at 10 mV/s; Pt ring held at 1.2 V vs RHE; O2 current corrected by subtracting N2 current.

Atmosphere: alkaline electrolyte, O2/N2 comparison
Geometry: drop-cast catalyst film on GC RRDE/RDE
Context: catalyst/Nafion electrode
Measurement source: 39077; 39079 · ORR Activity of Ni-HAB-H and Ni-HAB-L; Electrochemical Characterizations · Figure 3a,d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-HAB-L H2O2 selectivity	around 50%	—	—	Text Approximate	39077 · ORR Activity of Ni-HAB-H and Ni-HAB-L · Figure 3d
Ni-HAB-L ORR onset potential to reach limiting current	0.7 V vs RHE and higher overpotentials required	—	—	Text Rounded Reported	39077 · ORR Activity of Ni-HAB-H and Ni-HAB-L · Figure 3a

steady-state potentiostatic ORR stability

Ni-HAB-H drop-cast GC electrode · Electrode

Potential hold at 0.5 V vs RHE under ORR conditions; ring and disk currents recorded; CV scans before and after hold.

Atmosphere: alkaline ORR electrolyte
Geometry: drop-cast catalyst film on RRDE/RDE
Context: catalyst/Nafion electrode
Measurement source: 39077; 39079 · Stability of Ni-HAB during the ORR · Figure 3b,c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-HAB-H current retention during ORR stability holdMarked as a best value within this paper	nearly 100% of initial current density retained over 20 h	—	—	Text Approximate	39077 · Stability of Ni-HAB during the ORR · Figure 3b

steady-state potentiostatic ORR stability

Ni-HAB-L drop-cast GC electrode · Electrode

Potential hold at 0.5 V vs RHE for 12 h under ORR conditions; ring and disk currents recorded; CV scans before and after hold.

Atmosphere: alkaline ORR electrolyte
Geometry: drop-cast catalyst film on RRDE/RDE
Context: catalyst/Nafion electrode
Measurement source: 39077; 39079 · Stability of Ni-HAB during the ORR · Figure 3e,f

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-HAB-L current stability during 12 h hold	notable decrease in ORR and H2O2 current over 12 h, with irreversible redox features	—	—	Text Qualitative	39077 · Stability of Ni-HAB during the ORR · Figure 3e,f