Electrochemistry Application — Fabrication of high-performance supercapacitor of surface-engineered ZIF-8 for energy storage applications

11 measurement groups · 26 results

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

Activated-carbon anode CV/GCD supporting curves

Voltammetry Galvanostatic cycling

Ag@ZIF-8/AC hybrid supercapacitor · Electrode

AC anode supporting data: CV at 20 mV s-1 and GCD at 1 A g-1 current density from SI Fig. S1.

Context: hybrid-device supporting component
Measurement source: 5 · Figure S1 · Figure S1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
AC anode CV/GCD support shown in SI	AC CV at 20 mV s-1 and GCD at 1 A g-1 are shown in Figure S1; curves were not digitised.	—	—	Caption Qualitative	5 · Figure S1 · Figure S1

Cyclic voltammetry (CV)

Voltammetry

2-Ag@ZIF-8/Ni foam working electrode · Electrode

3 M KOH electrolyte; comparison at 10 mV s-1 and scan-rate series from 10 to 100 mV s-1 shown in Fig. 5.

Geometry: Three-electrode Ni foam working electrode configuration.
Context: 2-Ag@ZIF-8 compared with ZIF-8 and 1-Ag@ZIF-8.
Measurement source: 4-6 · 3.2.2. Electrochemical performance of fabricated electrodes as positive electrode · Fig. 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
2-Ag@ZIF-8 higher CV responseMarked as a best value within this paper	2-Ag@ZIF-8 delivered considerably higher specific capacitance than ZIF-8 and 1-Ag@ZIF-8	—	—	Text Qualitative	6 · 3.2.2. Electrochemical performance · Fig. 5a
2-Ag@ZIF-8 anodic CV peak potential	~0.4 V	—	~	Text Approximate	6 · 3.2.2. Electrochemical performance · Fig. 5
2-Ag@ZIF-8 cathodic CV peak potential	~0.17 V	—	~	Text Approximate	6 · 3.2.2. Electrochemical performance · Fig. 5

Cycling stability by repeated GCD

Galvanostatic cycling

2-Ag@ZIF-8/Ni foam working electrode · Electrode

2-Ag@ZIF-8 electrode cycled for 5000 cycles; current density reported inconsistently as 5 A g-1 in section text/Fig. 6 caption and 10 A g-1 in abstract.

Geometry: Three-electrode Ni foam working electrode configuration.
Context: Best Ag-decorated electrode.
Measurement source: 5 · 3.2.2. Electrochemical performance of fabricated electrodes as positive electrode · Fig. 6f

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
2-Ag@ZIF-8 capacitance retention after 5000 cyclesMarked as a best value within this paper	83.3 % after 5000 cycles	83.3 %	—	Text Exact Reported	7 · 3.2.2. Electrochemical performance · Fig. 6f

Electrochemical impedance spectroscopy (EIS)

Impedance spectroscopy

1-Ag@ZIF-8/Ni foam working electrode · Electrode

Three-electrode cell, 3 M KOH electrolyte, open-circuit potential, 10 mV voltage amplitude.

Geometry: Ni foam working electrode; Pt sheet counter electrode; AgCl/Ag reference electrode.
Context: Ag-decorated electrode compared with pristine ZIF-8.
Measurement source: 5 · 3.2.1. EIS measurements of ZIF-8, 1-Ag@ZIF-8, and 2-Ag@ZIF-8 · Fig. 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
1-Ag@ZIF-8 Nyquist high-Zprime extent	approximately 17 ohm g at the plotted high-impedance end	—	—	Figure Axis Approximate	4 · 3.2.1. EIS measurements · Fig. 4

Electrochemical impedance spectroscopy (EIS)

Impedance spectroscopy

2-Ag@ZIF-8/Ni foam working electrode · Electrode

Three-electrode cell, 3 M KOH electrolyte, open-circuit potential, 10 mV voltage amplitude.

Geometry: Ni foam working electrode; Pt sheet counter electrode; AgCl/Ag reference electrode.
Context: Higher-Ag electrode compared with pristine ZIF-8 and 1-Ag@ZIF-8.
Measurement source: 5-6 · 3.2.1. EIS measurements of ZIF-8, 1-Ag@ZIF-8, and 2-Ag@ZIF-8 · Fig. 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
2-Ag@ZIF-8 maximum real complex capacitance	approximately 0.0065 F g-1 on Cprime axis	—	—	Figure Axis Approximate	4 · 3.2.1. EIS measurements · Fig. 4
2-Ag@ZIF-8 Nyquist high-Zprime extent	approximately 14 ohm g at the plotted high-impedance end	—	—	Figure Axis Approximate	4 · 3.2.1. EIS measurements · Fig. 4
Ag@ZIF-8 faster ion diffusion and EDLC-like behaviourMarked as a best value within this paper	Ag@ZIF-8 low-frequency line almost normal to x-axis, implying modified pore structure, fast ion diffusion and EDLC-like behaviour	—	—	Text Qualitative	5 · 3.2.1. EIS measurements · Fig. 4a
Complex-capacitance increase after Ag decorationMarked as a best value within this paper	Ag-decorated materials show increased capacitance and facilitated ion diffusion in pores	—	—	Text Qualitative	6 · 3.2.1. EIS measurements · Fig. 4b

Electrochemical impedance spectroscopy (EIS)

Impedance spectroscopy

ZIF-8/Ni foam working electrode · Electrode

Three-electrode cell, 3 M KOH electrolyte, open-circuit potential, 10 mV voltage amplitude.

Geometry: Ni foam working electrode; Pt sheet counter electrode; AgCl/Ag reference electrode.
Context: Pristine ZIF-8 electrode control.
Measurement source: 5 · 3.2.1. EIS measurements of ZIF-8, 1-Ag@ZIF-8, and 2-Ag@ZIF-8 · Fig. 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ZIF-8 Nyquist high-Zprime extent	approximately 70 ohm g at the plotted high-impedance end	—	—	Figure Axis Approximate	4 · 3.2.1. EIS measurements · Fig. 4
ZIF-8 Warburg-type ion diffusion	Low-frequency straight line with slope of about 45 deg relative to x-axis, reflecting ion diffusion in pores	—	about	Text Approximate	5 · 3.2.1. EIS measurements · Fig. 4a

Galvanostatic charge-discharge (GCD)

Galvanostatic cycling

1-Ag@ZIF-8/Ni foam working electrode · Electrode

Three-electrode test in 3 M KOH; 1 A g-1 over 0-0.45 V; current density series shown in Fig. 6.

Geometry: Ni foam working electrode configuration.
Context: Lower-Ag electrode compared with pristine ZIF-8 and 2-Ag@ZIF-8.
Measurement source: 5-6 · 3.2.2. Electrochemical performance of fabricated electrodes as positive electrode · Fig. 6; Table 1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
1-Ag@ZIF-8 specific capacitance at 1 A g-1	260.7 F g-1	260.7 F g-1	—	Text Exact Reported	7 · 3.2.2. Electrochemical performance · Fig. 6b-d; Table 1

Galvanostatic charge-discharge (GCD)

Galvanostatic cycling

2-Ag@ZIF-8/Ni foam working electrode · Electrode

Three-electrode test in 3 M KOH; 1 A g-1 over 0-0.45 V; current density series shown in Fig. 6.

Geometry: Ni foam working electrode configuration.
Context: Best Ag-decorated electrode compared with pristine ZIF-8 and 1-Ag@ZIF-8.
Measurement source: 5-7 · 3.2.2. Electrochemical performance of fabricated electrodes as positive electrode · Fig. 6; Table 1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
2-Ag@ZIF-8 specific capacitance at 1 A g-1Marked as a best value within this paper	538.8 F g-1	538.8 F g-1	—	Text Exact Reported	7 · 3.2.2. Electrochemical performance · Fig. 6b-d; Table 1
2-Ag@ZIF-8 specific capacitance at 2 A g-1	approximately 475 F g-1 from Fig. 6e	475 F g-1	visual estimate from plotted point	Figure Axis Approximate	5 · Fig. 6 · Fig. 6e
2-Ag@ZIF-8 specific capacitance at 3 A g-1	approximately 410 F g-1 from Fig. 6e	410 F g-1	visual estimate from plotted point	Figure Axis Approximate	5 · Fig. 6 · Fig. 6e
2-Ag@ZIF-8 specific capacitance at 4 A g-1	approximately 375 F g-1 from Fig. 6e	375 F g-1	visual estimate from plotted point	Figure Axis Approximate	5 · Fig. 6 · Fig. 6e
2-Ag@ZIF-8 specific capacitance at 5 A g-1	approximately 335 F g-1 from Fig. 6e	335 F g-1	visual estimate from plotted point	Figure Axis Approximate	5 · Fig. 6 · Fig. 6e

Galvanostatic charge-discharge (GCD)

Galvanostatic cycling

ZIF-8/Ni foam working electrode · Electrode

Three-electrode test in 3 M KOH; 1 A g-1 over 0-0.45 V; current density series shown in Fig. 6.

Geometry: Ni foam working electrode configuration.
Context: Pristine ZIF-8 control.
Measurement source: 5-6 · 3.2.2. Electrochemical performance of fabricated electrodes as positive electrode · Fig. 6; Table 1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ZIF-8 specific capacitance at 1 A g-1	150 F g-1	150 F g-1	—	Table Exact Reported	6 · Table 1 · Table 1

Hybrid supercapacitor cycling stability and Coulombic efficiency

Ag@ZIF-8/AC hybrid supercapacitor · Electrode

Ag@ZIF-8/AC HS device cycled for 5000 cycles over 0-1.6 V; current density reported inconsistently as 5 A g-1 in text and 10 A g-1 in Fig. 7 caption.

Geometry: Asymmetric/hybrid two-electrode device.
Context: Device-level performance.
Measurement source: 7 · 3.2.3. Full cell performance as hybrid supercapacitor · Fig. 7c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ag@ZIF-8/AC HS Coulombic efficiency after cyclingMarked as a best value within this paper	99.18 %	99.18 %	read from Fig. 7c annotation	Figure Axis Rounded Reported	6 · Fig. 7 · Fig. 7c
Ag@ZIF-8/AC HS capacitance retention after 5000 cyclesMarked as a best value within this paper	94 % after 5000 cycles	94 %	—	Text Exact Reported	7 · 3.2.3. Full cell performance as hybrid supercapacitor · Fig. 7c

Hybrid supercapacitor GCD

Galvanostatic cycling

Ag@ZIF-8/AC hybrid supercapacitor · Electrode

Ag@ZIF-8 cathode and activated carbon anode in 3 M KOH; voltage-window series up to 1.6 V and current density series from 0.5 to 5 A g-1.

Geometry: Asymmetric/hybrid two-electrode device.
Context: Device based on Ag@ZIF-8 and AC; AC-anode supporting data are referenced in Fig. S1, but only the SI caption text is available.
Measurement source: 6-7 · 3.2.3. Full cell performance as hybrid supercapacitor · Fig. 7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Ag@ZIF-8/AC HS cell capacitance at 0.5 A g-1Marked as a best value within this paper	95 F g-1	95 F g-1	—	Text Exact Reported	7 · 3.2.3. Full cell performance as hybrid supercapacitor · Fig. 7b
Ag@ZIF-8/AC HS cell capacitance at 5 A g-1	5.96 F g-1	5.96 F g-1	—	Text Exact Reported	7 · 3.2.3. Full cell performance as hybrid supercapacitor · Fig. 7b
Ag@ZIF-8/AC HS energy densityMarked as a best value within this paper	33.77 Wh kg-1	33.77 Wh kg-1	—	Text Exact Reported	7 · 3.2.3. Full cell performance as hybrid supercapacitor
Ag@ZIF-8/AC HS optimal working voltageMarked as a best value within this paper	1.6 V	1.6 V	—	Text Exact Reported	7 · 3.2.3. Full cell performance as hybrid supercapacitor · Fig. 7a
Ag@ZIF-8/AC HS power densityMarked as a best value within this paper	399.9 W kg-1	399.9 W kg-1	—	Text Exact Reported	7 · 3.2.3. Full cell performance as hybrid supercapacitor