cMOF Evidence Base
Electrochemistry Application — Carbon quantum dot-mediated binary metal-organic framework nanosheets for efficient oxygen evolution at ampere-level current densities in proton exchange membrane electrolyzers

Measurement evidence

Electrochemistry Application

Carbon quantum dot-mediated binary metal-organic framework nanosheets for efficient oxygen evolution at ampere-level current densities in proton exchange membrane electrolyzers · Ni Q., Zhang S., Wang K. et al. · Journal of Materials Chemistry A · 2024 · 31253-31261

2 measurement groups · 17 results

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

PEM water electrolyser polarisation, chronopotentiometry and chronoamperometry

Galvanostatic cyclingChronoamperometry

NiFe-MOF-CQD/PEM/Pt-C electrolyser · Electrode

NiFe-MOF-CQD anode and Pt/C cathode in Nafion 115 PEM electrolyser; operating temperature 60 C; current-voltage curve without iR compensation; durability at 2 A cm-2 and/or 2 V.

Temperature
333
Geometry
58 cm2 effective membrane electrode area; anode loading 2.5 mg cm-2; cathode loading 0.25 mgPt cm-2
Context
target composite PEM application
Measurement source
31259 · Results and discussion · Figure 5
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
PEM membrane electrode effective area58 cm2——Text
Exact Reported		31254 · 2.5 Synthesis of PEM-WE
Chronoamperometry stabilitycurrent density remains constantly at 2 A cm-2 over 7 h at 2 V—over 7 hText
Approximate		31259 · Results and discussion · Figure 5e
Chronopotentiometry stabilityapproximately 2 V for over 7 h at 2 A cm-2—over 7 hText
Approximate		31259 · Results and discussion · Figure 5d
PEM cell voltage at 0.5 A cm-21.68 V at 0.5 A cm-2——Text
Exact Reported		31259 · Results and discussion · Figure 5c
PEM cell voltage at 1.0 A cm-21.79 V at 1.0 A cm-2——Text
Exact Reported		31259 · Results and discussion · Figure 5c
PEM cell voltage at 1.5 A cm-21.89 V at 1.5 A cm-2——Text
Exact Reported		31259 · Results and discussion · Figure 5c
PEM cell voltage at 2.0 A cm-2Marked as a best value within this paper2.00 V at 2.0 A cm-2——Text
Exact Reported		31259 · Results and discussion · Figure 5c

LSV, Tafel analysis, CV, EIS and Cdl/ECSA analysis

Impedance spectroscopyVoltammetryTafel and polarisation analysis

NiFe-MOF-CQD on glassy carbon electrode · Electrode

Three-electrode OER in O2-saturated 1.0 M KOH; rotation 1600 rpm for LSV; Ag/AgCl reference; graphite counter; iR compensation applied; CV activation 0.926-1.826 V vs RHE for 15 cycles at 50 mV s-1.

Atmosphere
O2-saturated for LSV; alkaline electrolyte
Geometry
glassy carbon electrode, 0.19625 cm2
Context
target composite compared with pristine NiFe-MOF, Ni-MOF and Fe-MOF controls
Measurement source
31257-31258 · Results and discussion · Figure 4; Figures S8-S11
PropertyReported valueNormalised valueUncertaintyOrigin and qualitySource
Double-layer capacitance CdlMarked as a best value within this paper0.0457 mF cm-2 for NiFe-MOF-CQD——Figure Axis
Rounded Reported		31258 · Results and discussion · Figure 4e
Double-layer capacitance Cdl0.0245 mF cm-2 for NiFe-MOF——Figure Axis
Rounded Reported		31258 · Results and discussion · Figure 4e
NiFe-MOF-CQD redox peak positionsaround 1.31 and 1.50 V vs RHE——Text
Approximate		31257 · Results and discussion · Figure S9
NiFe-MOF redox peak positions1.35 and 1.51 V vs RHE——Text
Approximate		31257 · Results and discussion · Figure S9
Charge-transfer resistance trendNiFe-MOF-CQD Rct notably lower than pure NiFe-MOF——Qualitative
Qualitative		31258 · Results and discussion · Figure 4c
Overpotential at 10 mA cm-2Marked as a best value within this paper280 mV for NiFe-MOF-CQD——Text
Exact Reported		31257 · Results and discussion · Figure 4a
Overpotential at 10 mA cm-2330 mV for NiFe-MOF——Text
Exact Reported		31257 · Results and discussion · Figure 4a
Ni-MOF and Fe-MOF OER activityfar inferior to NiFe-MOF——Qualitative
Qualitative		31257 · Results and discussion · Figure S8
Tafel slopeMarked as a best value within this paper71.98 mV dec-1 for NiFe-MOF-CQD——Text
Exact Reported		31257 · Results and discussion · Figure 4b
Tafel slope90.11 mV dec-1 for NiFe-MOF——Text
Exact Reported		31257 · Results and discussion · Figure 4b