Measurement evidence
CoP nanoparticles embedded in P and N co-doped carbon as efficient bifunctional electrocatalyst for water splitting · Zhou Z., Mahmood N., Zhang Y. et al. · Journal of Energy Chemistry · 2017 · 1223-1230
Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.
Carbon black control · Electrode
HER in 0.5 M H2SO4, HER in 1 M KOH, and OER in 1 M KOH; SI Figure S6.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Carbon black HER/OER activity control | negligible HER and OER activity | — | — | Qualitative Qualitative | p005 / article p.1227 · HER acidic media · Figure S6 cited |
CoP polyhedron control · Powder
0.5 M H2SO4; CoP polyhedron control; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Acid HER overpotential at 10 mA cm-2 for CoP | -167 mV at 10 mA cm-2 | — | — | Text Exact Reported | p005 / article p.1227 · HER acidic media · Figure 4a |
CoP/C · Electrode
0.5 M H2SO4; CoP plus 10 wt% carbon black; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Acid HER double-layer capacitance / ECSA proxy | 2.7 mF cm-2 | — | — | Text Exact Reported | p005 / article p.1227 · HER acidic media · Figure 4c |
| Acid HER overpotential at 10 mA cm-2 for CoP/C | -113 mV at 10 mA cm-2 | — | — | Text Exact Reported | p005 / article p.1227 · HER acidic media · Figure 4a |
CoP@PNC · Powder
0.5 M H2SO4; three-electrode cell; GCE working electrode; sweep rate 5 mV s-1; no iR compensation; catalyst loading 0.35 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Acid HER double-layer capacitance / ECSA proxy | 9.1 mF cm-2 | — | — | Text Exact Reported | p005 / article p.1227 · HER acidic media · Figure 4c |
| Acid HER overpotential at 10 mA cm-2Marked as a best value within this paper | -84 mV at 10 mA cm-2 | — | — | SI Table Exact Reported | p013 · Supporting Information · Table S3 |
| Acid HER onset potential | -38 mV | — | — | Text Exact Reported | p005 / article p.1227 · HER acidic media · Figure 4a |
| Acid HER Tafel slope | 57 mV dec-1 | — | — | Text Exact Reported | p005 / article p.1227 · HER acidic media · Figure 4b |
CoP@PNC/C · Electrode
0.5 M H2SO4; CoP@PNC plus 10 wt% carbon black; same GCE loading; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Acid HER double-layer capacitance / ECSA proxyMarked as a best value within this paper | 14.6 mF cm-2 | — | — | Text Exact Reported | p005 / article p.1227 · HER acidic media · Figure 4c |
| Acid HER overpotential at 10 mA cm-2 with added carbonMarked as a best value within this paper | -76 mV at 10 mA cm-2 | — | — | SI Table Exact Reported | p013 · Supporting Information · Table S3 |
CoP polyhedron control · Powder
1 M KOH; CoP control; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Alkaline HER overpotential at 10 mA cm-2 for CoP | -167 mV | — | — | Text Exact Reported | p006 / article p.1228 · HER alkaline media · Figure 5a |
| Alkaline HER charge-transfer resistance | 325 ohm | — | — | Text Exact Reported | p006 / article p.1228 · HER alkaline media · Figure 5c |
CoP/C · Electrode
1 M KOH; CoP plus 10 wt% carbon black; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Alkaline HER overpotential at 10 mA cm-2 for CoP/C | -138 mV | — | — | Text Exact Reported | p006 / article p.1228 · HER alkaline media · Figure 5a |
| Alkaline HER charge-transfer resistance | 100 ohm | — | — | Text Exact Reported | p006 / article p.1228 · HER alkaline media · Figure 5c |
CoP@PNC · Powder
1 M KOH; three-electrode cell; no iR compensation; EIS at -100 mV vs RHE from 100 kHz to 0.01 Hz.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Alkaline HER overpotential at 10 mA cm-2Marked as a best value within this paper | -120 mV at 10 mA cm-2 | — | — | SI Table Exact Reported | p014 · Supporting Information · Table S4 |
| Alkaline HER 20 h stability overpotential increaseMarked as a best value within this paper | increase of only -20 mV after 20 h | — | — | Text Rounded Reported | p006 / article p.1228 · HER alkaline media · Figure 5d |
| Alkaline HER Tafel slope | 66 mV dec-1 | — | — | Text Exact Reported | p006 / article p.1228 · HER alkaline media · Figure 5b |
| Alkaline HER charge-transfer resistance | 70 ohm | — | — | Text Exact Reported | p006 / article p.1228 · HER alkaline media · Figure 5c |
CoP@PNC/C · Electrode
1 M KOH; CoP@PNC plus 10 wt% carbon black; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Alkaline HER overpotential at 10 mA cm-2 with added carbonMarked as a best value within this paper | -114 mV at 10 mA cm-2 | — | — | SI Table Exact Reported | p014 · Supporting Information · Table S4 |
| Alkaline HER charge-transfer resistanceMarked as a best value within this paper | 66 ohm | — | — | Text Exact Reported | p006 / article p.1228 · HER alkaline media · Figure 5c |
CoP polyhedron control · Powder
1 M KOH; CoP control; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 for CoP | 370 mV | — | — | Text Exact Reported | p006 / article p.1228 · OER alkaline media · Figure 6a |
| OER Tafel slope for CoP | 72 mV dec-1 | — | — | Figure Axis Rounded Reported | p006 / article p.1228 · OER alkaline media · Figure 6b |
CoP/C · Electrode
1 M KOH; CoP plus 10 wt% carbon black; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 for CoP/C | 348 mV | — | — | Text Exact Reported | p006 / article p.1228 · OER alkaline media · Figure 6a |
CoP@PNC · Powder
1 M KOH; three-electrode cell; no iR compensation; EIS at 1.53 V vs RHE from 100 kHz to 0.01 Hz.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 | 330 mV at 10 mA cm-2 | — | — | SI Table Exact Reported | p015 · Supporting Information · Table S5 |
| OER onset potentialMarked as a best value within this paper | 1.48 V | — | — | Text Exact Reported | p006 / article p.1228 · OER alkaline media · Figure 6a |
| OER Tafel slope | 64 mV dec-1 | — | — | Text Exact Reported | p006 / article p.1228 · OER alkaline media · Figure 6b |
| OER 20 h stability overpotential increaseMarked as a best value within this paper | increase of 20 mV after 20 h | — | — | Text Rounded Reported | p006 / article p.1228 · OER alkaline media · Figure 6d |
CoP@PNC/C · Electrode
1 M KOH; CoP@PNC plus 10 wt% carbon black; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 with added carbonMarked as a best value within this paper | 327 mV | — | — | SI Table Exact Reported | p015 · Supporting Information · Table S5 |
| OER Tafel slope with added carbon | 64 mV dec-1 | — | — | Text Exact Reported | p006 / article p.1228 · OER alkaline media · Figure 6b |
Commercial IrO2 electrode · Electrode
1 M KOH; commercial IrO2 benchmark; no iR compensation.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| OER overpotential at 10 mA cm-2 for IrO2 | 360 mV | — | — | Text Exact Reported | p006 / article p.1228 · OER alkaline media · Figure 6a |
| OER Tafel slope for IrO2Marked as a best value within this paper | 53 mV dec-1 | — | — | Figure Axis Rounded Reported | p006 / article p.1228 · OER alkaline media · Figure 6b |
CoP@PNC//CoP@PNC two-electrode electrolyser · Electrode
Two-electrode cell in 1 M KOH; CoP@PNC used as both anode and cathode on nickel foam; loading 2 mg cm-2.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Overall water-splitting cell voltage at 100 mA cm-2Marked as a best value within this paper | 1.90 V at 100 mA cm-2 | — | — | Text Exact Reported | p007 / article p.1229 · Water splitting · Figure 7a |
| Overall water-splitting cell voltage at 10 mA cm-2Marked as a best value within this paper | 1.52 V at 10 mA cm-2 | — | — | SI Table Exact Reported | p016 · Supporting Information · Table S6 |
| Overall water-splitting 20 h durabilityMarked as a best value within this paper | only a negligible increase in overpotential after 20 h | — | — | Text Qualitative | p007 / article p.1229 · Water splitting · Figure 7b |
Pt/C//IrO2 two-electrode benchmark · Electrode
Two-electrode benchmark Pt/C//IrO2 system in 1 M KOH.
| Property | Reported value | Normalised value | Uncertainty | Origin and quality | Source |
|---|---|---|---|---|---|
| Pt/C//IrO2 cell voltage at 100 mA cm-2 | 1.97 V at 100 mA cm-2 | — | — | Text Exact Reported | p007 / article p.1229 · Water splitting · Figure 7a; Figure S11 cited |
| Pt/C//IrO2 cell voltage at 10 mA cm-2 | 1.56 V at 10 mA cm-2 | — | — | Text Exact Reported | p007 / article p.1229 · Water splitting · Figure 7a; Figure S11 cited |