Measurement evidence
Operando Elucidation of Electrocatalytic and Redox Mechanisms on a 2D Metal Organic Framework Catalyst for Efficient Electrosynthesis of Hydrogen Peroxide in Neutral Media · Ross R.D., Sheng H., Ding Y. et al. · Journal of the American Chemical Society · 2022 · 15845-15854
Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.
Blank CFP electrode · Electrode
0.4 V vs RHE in 0.5 M NaPi on CFP electrode with no catalyst loading.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Blank CFP maximum possible H2O2 | no more than 7 ppm at 100% selectivity | — | — | Caption Rounded Reported | S26 · Supporting Figures · Figure S31 |
| Blank CFP test-strip estimate | ~10 ppm H2O2 estimated after blank CFP measurement | — | — | Caption Approximate | S26 · Supporting Figures · Figure S31 |
Ni-HAB/CFP electrode · Electrode
Custom H-cell, O2-saturated 0.5 M NaPi pH 6.64, 5 mL initial volume, potentials 0.6/0.5/0.4 V vs RHE, aliquots analysed by UV-vis.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Final Faradaic efficiency at 0.4 V | 39% final Faradaic efficiency | — | — | Text Exact Reported | 15851 · Bulk Electrochemical Synthesis · Figure 5d |
| Bulk H2O2 concentration at 0.4 VMarked as a best value within this paper | 662 ppm (19.5 mM) after 90 min | 19.5 mM | — | SI Table Exact Reported | S40 · Supporting Tables · Table S21 |
| H2O2 production rate at 0.4 V | 58.5 mmol gcat-1 h-1 | — | — | SI Table Exact Reported | S41 · Supporting Tables · Table S22 |
| Bulk H2O2 yield at 0.4 VMarked as a best value within this paper | 86.2 umol after 90 min | — | — | SI Table Exact Reported | S40 · Supporting Tables · Table S21 |
| Final Faradaic efficiency at 0.5 V | 73% final Faradaic efficiency | — | — | Text Exact Reported | 15851-15852 · Bulk Electrochemical Synthesis and Conclusions · Figure 5d |
| Bulk H2O2 concentration at 0.5 V | 337 ppm (9.92 mM) after 90 min | 9.92 mM | — | SI Table Exact Reported | S39 · Supporting Tables · Table S21 |
| H2O2 production rate at 0.5 V | 25.6 mmol gcat-1 h-1 | — | — | SI Table Exact Reported | S41 · Supporting Tables · Table S22 |
| Bulk H2O2 yield at 0.5 V | 37.7 umol after 90 min | — | — | SI Table Exact Reported | S39 · Supporting Tables · Table S21 |
| Extended 0.6 V H2O2 concentration | up to 213 ppm over about 6 h | — | — | Text Rounded Reported | 15851 · Bulk Electrochemical Synthesis · Figure S30 |
| Extended 0.6 V production rate | 3.36 mmol gcat-1 h-1 over 6 h | — | — | SI Table Exact Reported | S41 · Supporting Tables · Table S22 |
| Final Faradaic efficiency at 0.6 V | about 61% FE at 90 min | — | — | Figure Axis Approximate | 15851 · Bulk Electrochemical Synthesis · Figure 5d |
| Bulk H2O2 concentration at 0.6 V | 48.0 ppm (1.41 mM) after 90 min | 1.41 mM | — | SI Table Exact Reported | S39 · Supporting Tables · Table S21 |
| H2O2 production rate at 0.6 V | 3.88 mmol gcat-1 h-1 | — | — | SI Table Exact Reported | S41 · Supporting Tables · Table S22 |
| Bulk H2O2 yield at 0.6 V | 5.72 umol after 90 min | — | — | SI Table Exact Reported | S39 · Supporting Tables · Table S21 |
Ni-HAB RRDE disk catalyst film · Electrode
Ni-HAB catalyst in Ar-saturated 0.05 M NaPi; scan-rate CVs used to identify linker redox potential.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Cathodic peak potential Epc | 0.20 V vs RHE | — | — | Text Exact Reported | 15847 · Results · Figure 2; Figure S7 |
| Half-wave linker redox potential EredoxMarked as a best value within this paper | 0.29 V vs RHE | — | — | Text Exact Reported | 15847 · Results · Figure S7a,b |
Ni-HAB/Nafion EQCM crystal · Electrode
QCM200, 5 MHz Cr/Au crystals; 0.05 M NaPi cycling under Ar and O2 at 25 deg C.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Ar-saturated EQCM mass-change behaviour | mass increases steadily during cathodic sweep and more rapidly when E < Eredox; about 100 ng net mass increase after cycle | — | — | Text Approximate | 15850 · Mechanisms of ORR · Figure 4c |
| EQCM Sauerbrey calibration constant | Cf = 110 +/- 2 Hz cm2 ug-1 | — | +/- 2 Hz cm2 ug-1 | Figure Axis Rounded Reported | S22 · Supporting Figures · Figure S25 |
| O2-saturated EQCM mass-change behaviour | slight initial mass increase during cathodic sweep, then mass decrease peaking at 0.3 V vs RHE on oxidative sweep | — | — | Text Exact Reported | 15850 · Mechanisms of ORR · Figure 4c |
Ni-HAB/CFP electrode · Electrode
KSCN added in 0.05 M NaPi to test Ni-site blocking on Ni-HAB/CFP ORR activity.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| KSCN poisoning effect on selective-region ORR | No change in ORR activity for Ni-HAB in the H2O2 selective region (E > Eredox) | — | — | Text Qualitative | 15851 · Mechanisms of ORR · Figure S27 |
Ni-HAB RRDE disk catalyst film · Electrode
Ni-HAB, Ni-HITP and Cu-HAB compared in 0.025 M Na2HPO4/NaH2PO4 buffer pH 6.5-6.6 at 1600 rpm.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Cu-HAB neutral ORR activity/selectivity | Cu-HAB exhibits low catalytic activity and selectivity toward 2e- ORR in neutral conditions | — | — | Text Qualitative | 15847 · Results · Figure S8 |
| Ni-HITP comparison | Ni-HAB is significantly more selective and active than Ni-HITP at lower overpotentials in neutral conditions | — | — | Text Qualitative | 15847 · Results · Figure S8 |
Ni-HAB RRDE disk catalyst film · Electrode
0.05 M NaPi buffer pH 6.5-6.6, 1600 rpm, 50 mV/s LSV or CA; O2-saturated and Ar-saturated conditions.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Low catalyst loading equivalent C | 68 ugC/cm2_disk | — | — | Text Rounded Reported | 15847 · Results · Figure 2 |
| Low catalyst loading equivalent N | 79 ugN/cm2_disk | — | — | Text Rounded Reported | 15847 · Results · Figure 2 |
| Low catalyst loading equivalent Ni | 83 ugNi/cm2_disk | — | — | Text Rounded Reported | 15847 · Results · Figure 2 |
| Apparent LSV H2O2 selectivity peak | approximately 50% from typical LSV | — | — | Text Approximate | 15847 · Results · Figure 2 |
| RRDE ring current across potential range | approximately 1 mA/cm2_disk | — | — | Text Approximate | 15847 · Results · Figure 2 |
| H2O2 selectivity at 0.6 V vs RHEMarked as a best value within this paper | >80% at 0.6 V vs RHE | — | — | Text Approximate | 15845 · Abstract |
| Ar-subtracted LSV slope-change potential | Eslope change = 0.27 V | — | — | Figure Axis Approximate | S11 · Supporting Figures · Figure S6 |