Measurement evidence
Composition-dependent electrocatalytic activities of NiFe-based selenides for the oxygen evolution reaction · Xuan C., Xia K., Lei W. et al. · Electrochimica Acta · 2018 · 64-72
Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.
Ni-Fe-Se1:1-180 · Powder
OER stability at constant current densities of 10 and 20 mA cm-2 for 12 h.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Chronopotentiometry durationMarked as a best value within this paper | 12 h at 10 and 20 mA cm-2 with slight variation | — | — | Text Exact Reported | p006 · Results and discussion · Fig. 5e |
Ni-Fe-Se1:1-180 · Powder
3000 CV cycles from 1.4 to 1.8 V at 100 mV s-1.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Durability cyclingMarked as a best value within this paper | 3000 CV cycles with tiny changes/negligible activity loss | — | — | Text Exact Reported | p006 · Results and discussion · Fig. 5f |
Ni-Fe-O · Powder
Measured at 1.5 V from 100 kHz to 0.01 Hz with 5 mV AC perturbation; Fig. S7 missing.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Approximate Ni-Fe-O charge-transfer resistance | ~9 ohm semicircle diameter from Figure S7 | — | — | Visual Estimate Uncertain | S-6 · Supporting Information · Figure S7 |
Ni-Fe-Se1:1-180 · Powder
Measured at 1.5 V from 100 kHz to 0.01 Hz with 5 mV AC perturbation; Fig. S7 missing.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Charge-transfer resistance | much lower charge-transfer resistance than Ni-Fe-O | — | — | Text Qualitative | p005 · Results and discussion · Fig. S7 (SI cited) |
| Approximate charge-transfer resistance | ~5 ohm semicircle diameter from Figure S7 | — | — | Visual Estimate Uncertain | S-6 · Supporting Information · Figure S7 |
Ir/C (20 wt% Ir) · Electrode
Mass current density benchmark for Ir/C.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Mass current density at 1.45 V | 7 mA mg-1 | — | — | Text Exact Reported | S-5 · Supporting Information, Figure S6 paragraph · Figure S6 / Figure 5b |
| Mass current density at 1.50 V | 78 mA mg-1 | — | — | Text Exact Reported | S-5 · Supporting Information, Figure S6 paragraph · Figure S6 / Figure 5b |
Ni-Fe-Se1:1-180 · Powder
Mass current density calculated using active Ni+Fe+Se mass fraction from TG/XRF.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Mass current density at 1.45 VMarked as a best value within this paper | 35 mA mg-1 | — | — | Text Exact Reported | S-5 · Supporting Information, Figure S6 paragraph · Figure S6 / Figure 5b |
| Mass current density at 1.50 VMarked as a best value within this paper | 266 mA mg-1 | — | — | Text Exact Reported | S-5 · Supporting Information, Figure S6 paragraph · Figure S6 / Figure 5b |
Ni-Fe-Se1:1-180 · Powder
CV at scan rate 50 mV s-1 comparing Ni-Fe-Se1:1-180 and Ni-Fe-O.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Ni redox peak current | Ni-Fe-Se1:1-180 redox peak current density is higher than Ni-Fe-O | — | — | Text Qualitative | p004 · Results and discussion · Fig. 5a |
Ir/C (20 wt% Ir) · Electrode
O2-saturated 1.0 M KOH; GCE working electrode; RHE reference; carbon rod counter; scan rate 5 mV s-1; IR-drop corrected; catalyst loading 0.42 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 | ~270 mV from Fig. 5c | — | — | Visual Estimate Approximate | p007 · Results and discussion · Fig. 5c |
| OER overpotential at 20 mA cm-2 | ~335 mV from Fig. 5c | — | — | Visual Estimate Approximate | p007 · Results and discussion · Fig. 5c |
Ni-Fe-O · Powder
O2-saturated 1.0 M KOH; GCE working electrode; RHE reference; carbon rod counter; scan rate 5 mV s-1; IR-drop corrected; catalyst loading 0.42 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 | 259 mV | — | — | Text Exact Reported | p005 · Results and discussion · Fig. 5b-c/S9 |
| OER overpotential at 20 mA cm-2 | 273 mV | — | — | Text Exact Reported | p005 · Results and discussion · Fig. 5b-c/S9 |
NiFe-PBA · Powder
O2-saturated 1.0 M KOH; GCE working electrode; RHE reference; carbon rod counter; scan rate 5 mV s-1; IR-drop corrected; catalyst loading 0.42 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 | 409 mV | — | — | Text Exact Reported | p005 · Results and discussion · Fig. 5b-c/S9 |
| OER overpotential at 20 mA cm-2 | 479 mV | — | — | Text Exact Reported | p005 · Results and discussion · Fig. 5b-c/S9 |
Ni-Fe-Se1:3-180 · Powder
O2-saturated 1.0 M KOH; GCE working electrode; RHE reference; carbon rod counter; scan rate 5 mV s-1; IR-drop corrected; catalyst loading 0.42 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 | ~286 mV from Figure S10b | — | — | Visual Estimate Approximate | S-7 · Supporting Information · Figure S10b |
| OER overpotential at 20 mA cm-2 | ~303 mV from Figure S10b | — | — | Visual Estimate Approximate | S-7 · Supporting Information · Figure S10b |
| Relative OER activity | higher overpotentials than Ni-Fe-Se1:1-180 | — | — | Text Qualitative | p005 · Results and discussion · Fig. S9/S10 (SI cited) |
Ni-Fe-Se3:1-180 · Powder
O2-saturated 1.0 M KOH; GCE working electrode; RHE reference; carbon rod counter; scan rate 5 mV s-1; IR-drop corrected; catalyst loading 0.42 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 | ~258 mV from Figure S10b | — | — | Visual Estimate Approximate | S-7 · Supporting Information · Figure S10b |
| OER overpotential at 20 mA cm-2 | ~282 mV from Figure S10b | — | — | Visual Estimate Approximate | S-7 · Supporting Information · Figure S10b |
| Relative OER activity | higher overpotentials than Ni-Fe-Se1:1-180 | — | — | Text Qualitative | p005 · Results and discussion · Fig. S9/S10 (SI cited) |
Ni-Fe-Se1:1-140 · Powder
O2-saturated 1.0 M KOH; GCE working electrode; RHE reference; carbon rod counter; scan rate 5 mV s-1; IR-drop corrected; catalyst loading 0.42 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 | ~255 mV from Figure S9b | — | — | Visual Estimate Approximate | S-7 · Supporting Information · Figure S9b |
| OER overpotential at 20 mA cm-2 | ~278 mV from Figure S9b | — | — | Visual Estimate Approximate | S-7 · Supporting Information · Figure S9b |
| Relative OER activity | higher overpotentials than Ni-Fe-Se1:1-180 due to incomplete conversion | — | — | Text Qualitative | p005 · Results and discussion · Fig. S9/S10 (SI cited) |
Ni-Fe-Se1:1-160 · Powder
O2-saturated 1.0 M KOH; GCE working electrode; RHE reference; carbon rod counter; scan rate 5 mV s-1; IR-drop corrected; catalyst loading 0.42 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 | ~248 mV from Figure S9b | — | — | Visual Estimate Approximate | S-7 · Supporting Information · Figure S9b |
| OER overpotential at 20 mA cm-2 | ~266 mV from Figure S9b | — | — | Visual Estimate Approximate | S-7 · Supporting Information · Figure S9b |
| Relative OER activity | higher overpotentials than Ni-Fe-Se1:1-180 due to incomplete conversion | — | — | Text Qualitative | p005 · Results and discussion · Fig. S9/S10 (SI cited) |
Ni-Fe-Se1:1-200 · Powder
O2-saturated 1.0 M KOH; GCE working electrode; RHE reference; carbon rod counter; scan rate 5 mV s-1; IR-drop corrected; catalyst loading 0.42 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 | 225 mV | — | — | Text Exact Reported | p005 · Results and discussion · Fig. 5b-c/S9 |
| OER overpotential at 20 mA cm-2 | 246 mV | — | — | Text Exact Reported | p005 · Results and discussion · Fig. 5b-c/S9 |
Ni-Fe-Se1:1-180 · Powder
O2-saturated 1.0 M KOH; GCE working electrode; RHE reference; carbon rod counter; scan rate 5 mV s-1; IR-drop corrected; catalyst loading 0.42 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2Marked as a best value within this paper | 216 mV | — | — | Text Exact Reported | p005 · Results and discussion · Fig. 5b-c/S9 |
| OER overpotential at 20 mA cm-2Marked as a best value within this paper | 244 mV | — | — | Text Exact Reported | p005 · Results and discussion · Fig. 5b-c/S9 |
| OER overpotential at 10 mA cm-2 in selenide literature comparison table | 228 mV in Table S1 for Ni-Fe-Se-180 | — | — | SI Table Exact Reported | S-10 · Supporting Information · Table S1 |
| OER overpotential at 20 mA cm-2 in selenide literature comparison table | 267 mV in Table S1 for Ni-Fe-Se-180 | — | — | SI Table Exact Reported | S-10 · Supporting Information · Table S1 |
Ir/C (20 wt% Ir) · Electrode
Tafel slope from OER polarisation data, Fig. 5d.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Tafel slope | 68 mV dec-1 | — | — | Figure Axis Rounded Reported | p007 · Results and discussion · Fig. 5d |
Ni-Fe-O · Powder
Tafel slope from OER polarisation data, Fig. 5d.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Tafel slope | 57 mV dec-1 | — | — | Figure Axis Rounded Reported | p007 · Results and discussion · Fig. 5d |
NiFe-PBA · Powder
Tafel slope from OER polarisation data, Fig. 5d.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Tafel slope | 250 mV dec-1 | — | — | Figure Axis Rounded Reported | p007 · Results and discussion · Fig. 5d |
Ni-Fe-Se1:1-180 · Powder
Tafel slope from OER polarisation data, Fig. 5d.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Tafel slopeMarked as a best value within this paper | 36 mV dec-1 | — | — | Figure Axis Rounded Reported | p007 · Results and discussion · Fig. 5d |
Pt/C+Ir/C air electrode · Electrode
Benchmark Pt/C+Ir/C air cathode tested under same Zn-air conditions.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Discharge-charge cycling durability | remarkable voltage losses after only 60 cycles | — | — | Text Exact Reported | p008 · Results and discussion · Fig. 6c |
| Peak power density | ~105 mW cm-2 from Fig. 6b | — | — | Visual Estimate Approximate | p008 · Results and discussion · Fig. 6b |
Ni-Fe-Se1:1-180 + N,S-CNT air electrode · Electrode
Two-electrode Zn-air cell; 6 M KOH + 0.2 M Zn(CH3COO)2 electrolyte; Zn foil anode; air cathode catalyst; cycling at 10 mA cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Discharge-charge cycling durabilityMarked as a best value within this paper | voltage changed slightly after 300 cycles at 10 mA cm-2 | — | — | Text Exact Reported | p008 · Results and discussion · Fig. 6c |
| Peak power densityMarked as a best value within this paper | 148.6 mW cm-2 | — | — | Text Exact Reported | p007 · Results and discussion · Fig. 6b |