Electrochemistry Application — A novel 2D conductive MOF nanobelts for highly efficient electrosynthesis of hydrogen peroxide

8 measurement groups · 20 results

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

Cyclic voltammetry double-layer capacitance fitting for ECSA comparison

Voltammetry

Ni-PTC-60 RRDE catalyst electrode · Electrode

CV in non-Faradaic region; SI states 1.0-1.1 V_RHE with scan rates 20-100 mV s-1.

Atmosphere: electrochemical electrolyte
Geometry: RRDE-type catalyst electrode
Context: catalyst/carbon/Nafion electrodes from Ni-PTC powders
Measurement source: 2 · 2.3 Electrochemistry performance characterization · Figure 3f; Figure S8

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-PTC-25 double-layer capacitance	approximately 0.32 mF cm-2	—	—	Figure Axis Approximate	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3f
Ni-PTC-60 double-layer capacitanceMarked as a best value within this paper	0.79 mF cm-2	—	—	Text Exact Reported	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3f
Ni-PTC-80 double-layer capacitance	approximately 0.39 mF cm-2	—	—	Figure Axis Approximate	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3f

In-situ electrochemical impedance spectroscopy (EIS)

Impedance spectroscopy

Ni-PTC-60 RRDE catalyst electrode · Electrode

Frequencies 0.05 Hz to 1 MHz, 12 points per decade, under 0.70, 0.65, 0.60, 0.55, and 0.50 V_RHE; CNLS fitting in ZView.

Atmosphere: electrochemical electrolyte
Geometry: RRDE-type catalyst electrode
Context: Ni-PTC-60 catalyst/carbon/Nafion electrode
Measurement source: 2 · 2.3 Electrochemistry performance characterization · Figure 3g,h; Figure S9

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-PTC-60 charge-transfer resistance decrease	Rct decreased by 98% from 0.70 to 0.50 V vs RHE	—	—	Text Exact Reported	6 · 3.2 Electrocatalytic 2e ORR performance · Figure 3h

Three-compartment flow-cell chronopotentiometry and cerimetry H2O2 assay

Galvanostatic cycling

Ni-PTC-60 flow-cell gas-diffusion electrode · Electrode

1.0 cm2 working electrode; 10 mL 0.1 M KOH in cathode and anode compartments; electrolyte circulation 5 mL min-1; O2 flow 20 mL min-1.

Atmosphere: continuous O2 flow
Geometry: three-compartment gas-diffusion electrolytic flow cell with Fumasep FAA-3-PK-130 membrane
Context: Ni-PTC-60/carbon/Nafion on GDL carbon paper
Measurement source: 2 · 2.3 Flow cell measurements · Figure 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Flow-cell Faradaic efficiency at 200 mA cm-2Marked as a best value within this paper	reached 80% under 200 mA cm-2	—	—	Text Rounded Reported	6 · 3.3 Electrocatalytic performance in the flow cell · Figure 4c
Flow-cell H2O2 concentration after 70 minMarked as a best value within this paper	24.93 mmol L-1 after 70 min at 50 mA cm-2	—	—	Text Exact Reported	6 · 3.3 Electrocatalytic performance in the flow cell · Figure 4d
Ni-PTC-60 flow-cell H2O2 production rateMarked as a best value within this paper	11.96 mol gcat-1 h-1	11960 mmol g-1 h-1	—	Text Exact Reported	6 · 3.3 Electrocatalytic performance in the flow cell · Figure 4f; Table S6
Ni-PTC-60 flow-cell H2O2 selectivityMarked as a best value within this paper	95%	—	—	Text Rounded Reported	6 · 3.3 Electrocatalytic performance in the flow cell · Figure 4f; Table S6
Ni-PTC-60 flow-cell stable operation time	3 h	—	—	Text Exact Reported	6 · 3.3 Electrocatalytic performance in the flow cell · Figure 4e; Table S6

RRDE linear sweep voltammetry for 2e ORR

Voltammetry

Ni-PTC-25 RRDE catalyst electrode · Electrode

O2-saturated 0.1 M KOH; LSV 0.1-1.2 V vs RHE at 10 mV s-1.

Temperature: room temperature
Atmosphere: O2-saturated electrolyte
Geometry: RRDE, catalyst loading 0.1 mg cm-2
Context: catalyst/carbon/Nafion electrode from Ni-PTC-25 control powder
Measurement source: 5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3a-c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-PTC-25 ORR current density at 0.1 VMarked as a best value within this paper	about 2.5 mA cm-2 at 0.1 V vs RHE	—	—	Text Approximate	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3a

RRDE linear sweep voltammetry for 2e ORR

Voltammetry

Ni-PTC-60 RRDE catalyst electrode · Electrode

O2-saturated 0.1 M KOH; three-electrode RRDE; LSV 0.1-1.2 V vs RHE at 10 mV s-1; Pt ring at 1.5 V vs RHE for H2O2 detection.

Temperature: room temperature
Atmosphere: O2-saturated electrolyte
Geometry: RRDE, catalyst loading 0.1 mg cm-2
Context: catalyst/carbon/Nafion electrode from pristine Ni-PTC-60 powder
Measurement source: 2 · 2.2 Electrochemical rotating ring disk electrode measurements · Figure 3a-d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
RRDE collection efficiency	N = 0.436	—	—	Figure Axis Approximate	5 · Figure S6 · Figure S6b
Ni-PTC-60 Faradaic efficiency at 0.1 VMarked as a best value within this paper	96% at 0.1 V vs RHE	—	—	Text Exact Reported	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3d
Ni-PTC-60 RRDE onset potentialMarked as a best value within this paper	0.68 V vs RHE	—	—	Text Exact Reported	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3a
Ni-PTC-60 H2O2 selectivity by RRDEMarked as a best value within this paper	95%	—	—	Text Rounded Reported	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3b
Ni-PTC-60 Tafel slopeMarked as a best value within this paper	approximately 78.9 mV dec-1	—	—	Figure Axis Approximate	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3e
Ni-PTC-60 electron transfer number at 0.1 VMarked as a best value within this paper	2.04	—	—	Text Exact Reported	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3d

RRDE linear sweep voltammetry for 2e ORR

Voltammetry

XC72 carbon black RRDE control electrode · Electrode

O2-saturated 0.1 M KOH; carbon black comparison electrode.

Temperature: room temperature
Atmosphere: O2-saturated electrolyte
Geometry: RRDE
Context: non-MOF carbon control
Measurement source: 5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
XC72 CB H2O2 selectivity range	71%-78%	—	—	Text Range	5 · 3.2 Electrocatalytic 2e ORR performance · Figure 3b

CV cycling durability and post-test SEM/XRD

X-ray diffraction and scattering Scanning electron microscopy Voltammetry

Ni-PTC-60 RRDE catalyst electrode · Electrode

10,000 CV cycles in 0.1 M KOH; SI states CV in 0.6-0.8 V_RHE for electrode stability.

Atmosphere: electrochemical electrolyte
Geometry: RRDE-type catalyst electrode
Context: Ni-PTC-60 catalyst/carbon/Nafion electrode
Measurement source: 6 · 3.2 Electrocatalytic 2e ORR performance · Figure 3i; Figure S10

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-PTC-60 activity retention after cycling	93% after 10,000 CV cycles	—	—	Text Exact Reported	6 · 3.2 Electrocatalytic 2e ORR performance · Figure 3i; Figure S10

Ce(SO4)2 UV-vis calibration for H2O2 quantification

UV-visible and optical absorption spectroscopy

Ni-PTC-60 flow-cell gas-diffusion electrode · Electrode

1 mM Ce(SO4)2 in 0.5 M H2SO4; 400 uL Ce(SO4)2 solution added to cathode solution; Ce4+ concentration by UV-vis.

Geometry: flow-cell catholyte assay
Context: H2O2 generated by Ni-PTC-60 flow-cell electrode
Measurement source: 3 · 2.3 Electrochemistry performance characterization · Figure S13

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ce(SO4)2 UV-vis calibration R2	R2 = 0.9999	—	—	Figure Axis Approximate	7 · Figure S13 · Figure S13b
Ce(SO4)2 UV-vis calibration slope	y = 5.340x	—	—	Figure Axis Approximate	7 · Figure S13 · Figure S13b