Electrochemistry Application — Ligand engineering of Co-MOF-74 with hexaaminotriphenylene for enhanced oxygen reduction reaction in zinc-air batteries

6 measurement groups · 30 results

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

electrochemical impedance spectroscopy (EIS)

Impedance spectroscopy

Co-MOF-74-HATP@EC-300J RRDE electrode · Electrode

ORR EIS comparison of Co-MOF-74-HATP@EC-300J and Co-MOF-74@EC-300J from Fig. 3(d).

Atmosphere: alkaline ORR test conditions
Geometry: electrode geometry as ORR RRDE sample
Context: target compared with pristine-control composite
Measurement source: 5 · Results and discussion · Fig. 3(d)

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ORR charge-transfer resistance after HATP modificationMarked as a best value within this paper	lower charge resistance for Co-O5-N configuration	—	—	Qualitative Qualitative	5 · Results and discussion · Fig. 3(d)

OER LSV, Tafel, EIS, CV double-layer capacitance and ECSA analysis

Impedance spectroscopy Voltammetry Tafel and polarisation analysis

Co-MOF-74-HATP@EC-300J carbon-cloth OER electrode · Electrode

OER in N2-saturated 1 M KOH; LSV at 5 mV s-1 after 50 CV cycles activation; EIS from 10^-2 to 10^5 Hz at 5 mV amplitude; Cdl from 5-25 mV s-1 CV in non-Faradaic range.

Atmosphere: N2-saturated 1 M KOH
Geometry: 1 x 1 cm2 carbon-cloth electrode, 0.5 mg cm-2 catalyst loading
Context: target compared with RuO2 and carbon cloth controls
Measurement source: 1 · Electrochemical characterizations

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ECSA of Co-MOF-74-HATP@EC-300JMarked as a best value within this paper	1147.5 cm-2	—	—	Text Exact Reported	5 · Results and discussion · Figs. S17-S19
ECSA ratio relative to RuO2Marked as a best value within this paper	more than 7.6 times that of RuO2	—	>	Text Approximate	5 · Results and discussion · Figs. S17-S19
Double-layer capacitance of Co-MOF-74-HATP@EC-300JMarked as a best value within this paper	45.9 mF cm-2	—	—	Figure Axis Rounded Reported	7 · Supplementary figures · Fig. S19
Double-layer capacitance of RuO2	6.0 mF cm-2	—	—	Figure Axis Rounded Reported	7 · Supplementary figures · Fig. S19
OER overpotential of Co-MOF-74-HATP@EC-300J at 10 mA cm-2Marked as a best value within this paper	320 mV at 10 mA cm-2	0.32 V	—	Text Exact Reported	5 · Results and discussion · Fig. S14
OER overpotential of RuO2 at 10 mA cm-2	approximately 350 mV at 10 mA cm-2	—	—	Figure Axis Approximate	6 · Supplementary figures · Fig. S14
OER Tafel slope of Co-MOF-74-HATP@EC-300JMarked as a best value within this paper	133 mV dec-1	—	—	Text Exact Reported	5 · Results and discussion · Fig. S15
OER Tafel slope of RuO2	217 mV dec-1	—	—	Figure Axis Rounded Reported	6 · Supplementary figures · Fig. S15

ORR CV, LSV, rotating ring-disk electrode and Tafel analysis

Voltammetry Tafel and polarisation analysis

Co-MOF-74-HATP@EC-300J RRDE electrode · Electrode

ORR in 1 M KOH after N2 or O2 purging for 30 min; LSV at 5 mV s-1 and different rotation speeds; Fig. 3(b) at 1600 rpm; RRDE ring electrode at 1.5 V vs RHE.

Atmosphere: O2-saturated and N2-saturated alkaline electrolyte
Geometry: RRDE, 0.247 cm2 electrode area; 1600 rpm for Fig. 3(b)
Context: target Co-MOF-74-HATP@EC-300J compared with Co-MOF-74@EC-300J and EC-300J
Measurement source: 1 · Electrochemical characterizations

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
CV oxidation-reduction peak associated with Co	0.43 V	—	—	Text Exact Reported	4 · Results and discussion · Fig. S10
ORR half-wave potential of Co-MOF-74@EC-300J	E1/2 = 0.73 V	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3(b)
ORR half-wave potential of Co-MOF-74-HATP@EC-300JMarked as a best value within this paper	E1/2 = 0.84 V	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3(b)
Positive shift in ORR half-wave potential from HATP modificationMarked as a best value within this paper	110 mV more positive	0.11 V	—	Text Exact Reported	4 · Results and discussion · Fig. 3(b)
ORR Tafel slope of Co-MOF-74@EC-300J	72.71 mV dec-1	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3(c)
ORR Tafel slope of Co-MOF-74-HATP@EC-300JMarked as a best value within this paper	47.82 mV dec-1	—	—	Text Exact Reported	4 · Results and discussion · Fig. 3(c)

accelerated CV ageing, Koutecky-Levich analysis and H2O2 selectivity

Voltammetry Tafel and polarisation analysis

Co-MOF-74-HATP@EC-300J RRDE electrode · Electrode

LSV before/after 10,000 CV cycles; electron-transfer number and H2O2 yield from RRDE/K-L analysis; collection efficiency N=0.37.

Atmosphere: alkaline ORR electrolyte
Geometry: RRDE
Context: target compared with Co-O5 Co-MOF-74 control for peroxide yield
Measurement source: 1 · Electrochemical characterizations

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ORR transferred electron number for Co-O5-N configuration	n = 2.9	—	—	Text Exact Reported	5 · Results and discussion · Fig. 3(f); Figs. S12-S13
H2O2 yield for Co-O5 configuration	75%	0.75 fraction	—	Text Exact Reported	5 · Results and discussion · Figs. S12-S13
H2O2 yield for Co-O5-N configurationMarked as a best value within this paper	53%	0.53 fraction	—	Text Exact Reported	5 · Results and discussion · Fig. 3(f); Figs. S12-S13
Post-CV FTIR/XRD structural stability	no notable variation in FTIR spectra or XRD patterns after CV stability test	—	—	Qualitative Qualitative	5 · Results and discussion · Fig. S11
ORR half-wave-potential loss after 10,000 CV cyclesMarked as a best value within this paper	Delta E1/2 = 20 mV negative shift	0.02 V	—	Text Exact Reported	5 · Results and discussion · Fig. 3(e)

literature comparison table for ORR activity

Co-MOF-74-HATP@EC-300J RRDE electrode · Electrode

SI Table S2 compares ORR activity of various non-precious catalysts and reports the paper's catalyst in 1.0 M KOH.

Atmosphere: alkaline ORR electrolyte
Geometry: not specified in table
Context: target catalyst compared with literature non-precious catalysts
Measurement source: 9 · Table S2 · Table S2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
SI Table S2 ORR half-wave potential for this workMarked as a best value within this paper	E1/2 = 0.84 V vs RHE in 1.0 M KOH	—	—	SI Table Exact Reported	9 · Table S2 · Table S2
SI Table S2 ORR onset potential for this workMarked as a best value within this paper	Eonset = 0.88 V vs RHE in 1.0 M KOH	—	—	SI Table Exact Reported	9 · Table S2 · Table S2

alkaline zinc-air battery testing

zinc-air battery with Co-MOF-74-HATP@EC-300J air cathode · Electrode

Open-circuit voltage, charge/discharge curves, power density and cycling stability of ZAB with Co-MOF-74-HATP@EC-300J cathode; commercial 20% Pt/C + RuO2 control uses same assembly procedure.

Atmosphere: air cathode
Geometry: carbon paper cathode, zinc sheet/foil anode, 6.0 M KOH + 0.2 M Zn(CH3COO)2 electrolyte
Context: application device compared with commercial 20% Pt/C + RuO2 electrode
Measurement source: 2 · Zinc-air battery performance test

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ZAB cycling current density	1 mA cm-2	—	—	Text Exact Reported	6 · Figure caption · Fig. 4(e)
ZAB cycling duration at reported voltage gapMarked as a best value within this paper	500 h at 1 mA cm-2	—	—	Text Exact Reported	5 · Results and discussion · Fig. 4(e)
Two-cell LED demonstration	two zinc-air batteries in series powered an LED lamp	—	—	Qualitative Qualitative	5 · Results and discussion · Fig. 4(f); Fig. S22
Open-circuit voltage of ZAB with Co-MOF-74-HATP@EC-300JMarked as a best value within this paper	1.37 V	—	—	Text Exact Reported	5 · Results and discussion · Fig. 4(b); Fig. S20
Photographed OCV of Co-MOF-74-HATP ZABMarked as a best value within this paper	1.377 V	—	—	Figure Axis Rounded Reported	8 · Supplementary figures · Fig. S20
Photographed OCV of 20% Pt/C + RuO2 ZAB	1.360 V	—	—	Figure Axis Rounded Reported	8 · Supplementary figures · Fig. S20
Peak power density of ZAB with Co-MOF-74-HATP@EC-300JMarked as a best value within this paper	96.6 mW cm-2	—	—	Text Exact Reported	5 · Results and discussion · Fig. 4(d)
Voltage gap during ZAB cyclingMarked as a best value within this paper	0.77 V over 500 h at 1 mA cm-2	—	—	Text Exact Reported	5 · Results and discussion · Fig. 4(e)