Electrochemistry Application — A two-dimensional semiconducting covalent organic framework with nickel(II) coordination for high capacitive performance

4 measurement groups · 16 results

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

Two-electrode asymmetric supercapacitor CV, GCD and Ragone analysis

Voltammetry Galvanostatic cycling

AC//Ni-COF asymmetric supercapacitor device · Electrode

AC//Ni-COF device in 3 M KOH; CV at 100 mV s^-1 over voltage windows up to 1.5 V; scan rates 5-30 mV s^-1; GCD current densities 1-10 A g^-1.

Geometry: Activated carbon negative electrode paired with Ni-COF positive electrode
Context: asymmetric device using Ni-COF active electrode
Measurement source: main p.4-5, article pp.19679-19680 · Device evaluation · Fig. 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
AC//Ni-COF device capacitance at 1 A g^-1Marked as a best value within this paper	417 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	main p.5, article p.19680 · Device evaluation · Fig. 4e
AC//Ni-COF device capacitance at 10 A g^-1	212 F g^-1 at 10 A g^-1	—	—	Text Exact Reported	main p.5, article p.19680 · Device evaluation · Fig. 4e
AC//Ni-COF device energy densityMarked as a best value within this paper	130 W h kg^-1 at 839 W kg^-1	—	—	Text Exact Reported	main p.5, article p.19680 · Device evaluation · Fig. 4f
Power density at 130 W h kg^-1	839 W kg^-1	—	—	Text Exact Reported	main p.5, article p.19680 · Device evaluation · Fig. 4f
AC//Ni-COF working potential window	as large as 1.5 V	—	—	Text Rounded Reported	main p.4, article p.19679 · Device evaluation · Fig. 4a-b

CV, GCD and cycling stability in a three-electrode setup

Voltammetry Galvanostatic cycling

Ni0-COF three-electrode working electrode · Electrode

3 M KOH aqueous electrolyte; CV scan rates 5-30 mV s^-1; GCD current densities 0.5-10 A g^-1; cycling at 1 A g^-1.

Geometry: Ni0-COF composite working electrode on Ni foam
Context: nickel-free control active material in composite electrode
Measurement source: SI p.16 · Characterization · Fig. S19-S20

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni0-COF specific capacitance at 0.5 A g^-1Marked as a best value within this paper	204 F g^-1 at 0.5 A g^-1	—	—	Text Exact Reported	SI p.17 · Characterization · Fig. S20
Ni0-COF specific capacitance at 1 A g^-1	184 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	SI p.16 · Characterization · Fig. S19
Ni0-COF specific capacitance at 10 A g^-1	112 F g^-1 at 10 A g^-1	—	—	Text Exact Reported	SI p.16 · Characterization · Fig. S19
Ni0-COF cycling capacitance retention	87.5% after 10000 cycles	—	—	Text Exact Reported	SI p.16 · Characterization · Fig. S19

CV, GCD and EIS in a three-electrode setup

Impedance spectroscopy Voltammetry Galvanostatic cycling

Ni-COF three-electrode working electrode · Electrode

3 M KOH aqueous electrolyte; Pt plate counter electrode; Hg/HgO reference electrode; potential range 0-0.6 V vs Hg/HgO; CV scan rates 5-30 mV s^-1; GCD current densities 0.5-10 A g^-1.

Geometry: Ni-COF composite working electrode on 1 cm2 Ni foam; mass loading 5.0 mg cm^-2
Context: Ni-COF active material in composite electrode
Measurement source: SI p.3 · Electrochemical performance experiments · Fig. 3; Fig. S17-S18

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni-COF specific capacitance at 0.5 A g^-1Marked as a best value within this paper	1478 F g^-1 at 0.5 A g^-1	—	—	Text Exact Reported	SI p.15 · Characterization · Fig. S17
Ni-COF specific capacitance at 1 A g^-1	1257 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	main p.3, article p.19678 · Electrochemistry · Fig. 3c
Ni-COF specific capacitance at 10 A g^-1	711 F g^-1 at 10 A g^-1	—	—	Text Exact Reported	main p.3, article p.19678 · Electrochemistry · Fig. 3c
Ni-COF specific capacitance at 2 A g^-1	1054 F g^-1 at 2 A g^-1	—	—	Text Exact Reported	main p.3, article p.19678 · Electrochemistry · Fig. 3c
Ni-COF cycling capacitance retention	94% after 10000 cycles at 1 A g^-1	—	—	Text Exact Reported	main p.3, article p.19678 · Electrochemistry · Fig. 3e
Ni-COF EIS charge-transfer resistance comparison	lower Rct and Rs than Ni0-COF	—	—	Qualitative Qualitative	main p.4, article p.19679 · Electrochemistry · Fig. 3f

CV and GCD substrate control

Voltammetry Galvanostatic cycling

Ni foam electrochemical substrate control · Electrode

Ni foam evaluated to preclude substrate contribution; compared with Ni-COF at 1 A g^-1.

Geometry: Ni foam substrate
Context: substrate control
Measurement source: SI p.15 · Characterization · Fig. S18

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ni foam substrate capacitance at 1 A g^-1	48 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	SI p.15 · Characterization · Fig. S18