Electrochemistry Application — Negative electrodes for supercapacitors with good performance using conductive bismuth-catecholate metal-organic frameworks

5 measurement groups · 32 results

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

CV scan-rate analysis using Dunn theory

Voltammetry

Bi(HHTP) 4/8/12/20 h carbon-cloth electrode series · Electrode

CV profiles at 5-100 mV s^-1; log i versus log v fitted for oxidation peaks; capacitive contribution ratios estimated as a function of scan rate.

Geometry: carbon cloth working electrode with Bi(HHTP)/Super-P/PVDF slurry
Context: Composite electrodes containing pristine Bi(HHTP) active material.
Measurement source: p006 / article p.4831 · Charge storage mechanism · Figure 6

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
b-value Bi(HHTP) 12 h oxidation peak 1	0.69	—	—	Text Exact Reported	p006 / article p.4831 · Charge storage mechanism · Figure 6h
b-value Bi(HHTP) 12 h oxidation peak 2	0.52	—	—	Text Exact Reported	p006 / article p.4831 · Charge storage mechanism · Figure 6h
b-value Bi(HHTP) 20 h oxidation peak 1	0.72	—	—	Text Exact Reported	p006 / article p.4831 · Charge storage mechanism · Figure 6k
b-value Bi(HHTP) 20 h oxidation peak 2	0.59	—	—	Text Exact Reported	p006 / article p.4831 · Charge storage mechanism · Figure 6k
b-value Bi(HHTP) 4 h oxidation peak 1	0.81	—	—	Text Exact Reported	p006 / article p.4831 · Charge storage mechanism · Figure 6b
b-value Bi(HHTP) 4 h oxidation peak 2	0.65	—	—	Text Exact Reported	p006 / article p.4831 · Charge storage mechanism · Figure 6b
b-value Bi(HHTP) 8 h oxidation peak 1	0.70	—	—	Text Exact Reported	p006 / article p.4831 · Charge storage mechanism · Figure 6e
b-value Bi(HHTP) 8 h oxidation peak 2	0.61	—	—	Text Exact Reported	p006 / article p.4831 · Charge storage mechanism · Figure 6e
surface-capacitive contribution Bi(HHTP) 12 h at 100 mV s^-1	about 63% from Figure 6i bar label	—	visual read from rendered Figure 6i	Figure Axis Approximate	p006 / article p.4831 · Charge storage mechanism · Figure 6i

SI XRD impurity estimate and GCD control

X-ray diffraction and scattering Galvanostatic cycling

0.25Bi(C2H3O2)3:Bi(HHTP) 12 h mixture electrode · Electrode

Bi(C2H3O2)3, Bi(HHTP) 12 h, and 0.25:1 Bi(C2H3O2)3:Bi(HHTP) 12 h electrodes compared at 1 A g^-1.

Geometry: electrode formulation not separately specified
Context: Impurity-control samples for Bi(HHTP) 12 h.
Measurement source: p004 and p008 · The Residual Impurity in Bi(HHTP) Nanobelts and Its Influences · Figures S1 and S5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
specific capacitance of Bi(C2H3O2)3 control electrode	36 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	p008 · The Residual Impurity in Bi(HHTP) Nanobelts and Its Influences · Figure S5
estimated residual Bi(C2H3O2)3:Bi(HHTP) mass ratio in 12 h sample	about 0.0073:1	—	—	Text Approximate	p008 · The Residual Impurity in Bi(HHTP) Nanobelts and Its Influences · Figure S1
specific capacitance of 0.25:1 Bi(C2H3O2)3:Bi(HHTP) 12 h mixture	222 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	p008 · The Residual Impurity in Bi(HHTP) Nanobelts and Its Influences · Figure S5

Three-electrode CV and galvanostatic charge-discharge

Voltammetry Galvanostatic cycling

Bi(HHTP) 4/8/12/20 h carbon-cloth electrode series · Electrode

3 M KOH electrolyte; Hg/HgO reference and Pt counter electrode; CV at 20 mV s^-1 and GCD at 1 A g^-1 for specific capacitance.

Geometry: carbon cloth working electrode with Bi(HHTP)/Super-P/PVDF slurry
Context: Composite electrodes containing pristine Bi(HHTP) active material.
Measurement source: p005 / article p.4830 · Electrochemical properties · Figure 5 and Table 1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
specific capacitance Bi(HHTP) 12 h electrodeMarked as a best value within this paper	234 F g^-1 at 1 A g^-1; Table 1 reports 234.0	—	—	Text Exact Reported	p005 / article p.4830 · Electrochemical properties · Figure 5b and Table 1
specific capacitance Bi(HHTP) 20 h electrode	155 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	p005 / article p.4830 · Electrochemical properties · Figure 5b
specific capacitance Bi(HHTP) 4 h electrode	128 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	p005 / article p.4830 · Electrochemical properties · Figure 5b
specific capacitance Bi(HHTP) 8 h electrode	183 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	p005 / article p.4830 · Electrochemical properties · Figure 5b
cycling capacitance retention Bi(HHTP) 12 hMarked as a best value within this paper	72% after 1000 cycles at 4 A g^-1	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure 5d
cycling capacitance retention Bi(HHTP) 20 h	59% after 1000 cycles at 4 A g^-1	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure 5d
cycling capacitance retention Bi(HHTP) 4 h	28% after 1000 cycles at 4 A g^-1	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure 5d
cycling capacitance retention Bi(HHTP) 8 h	67% after 1000 cycles at 4 A g^-1	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure 5d
three-electrode stability/potential window	-1.2 to -0.2 V vs Hg/HgO in 3 M KOH	—	—	Text Range	p005 / article p.4830 · Electrochemical properties · Table 1
capacitance retention from 1 to 10 A g^-1, 12 h	37%	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure 5c
capacitance retention from 1 to 10 A g^-1, 20 h	41%	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure 5c
capacitance retention from 1 to 10 A g^-1, 4 hMarked as a best value within this paper	51%	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure 5c
capacitance retention from 1 to 10 A g^-1, 8 h	36%	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure 5c

Electrochemical impedance spectroscopy

Impedance spectroscopy

Bi(HHTP) 4/8/12/20 h carbon-cloth electrode series · Electrode

Nyquist plots of Bi(HHTP) 4, 8, 12 and 20 h electrodes; Rs extracted from high-frequency regions.

Geometry: carbon cloth working electrode with Bi(HHTP)/Super-P/PVDF slurry
Context: Composite electrodes containing pristine Bi(HHTP) active material.
Measurement source: p006 / article p.4831 · Electrochemical properties · Figure S7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
equivalent series resistance Bi(HHTP) 12 h electrodeMarked as a best value within this paper	0.42 ohm	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure S7
equivalent series resistance Bi(HHTP) 20 h electrode	1.03 ohm	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure S7
equivalent series resistance Bi(HHTP) 4 h electrode	0.98 ohm	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure S7
equivalent series resistance Bi(HHTP) 8 h electrode	0.77 ohm	—	—	Text Exact Reported	p006 / article p.4831 · Electrochemical properties · Figure S7

Two-electrode supercapacitor CV, GCD, rate and cycling tests

Voltammetry Galvanostatic cycling

Bi(HHTP) 12 h carbon-cloth electrode · Electrode

Ni(OH)2 positive electrode, Bi(HHTP) negative electrode, 6 M KOH electrolyte; positive:negative active-material mass ratio 1:3.

Geometry: two-electrode cell
Context: Application device using Bi(HHTP) as the negative electrode.
Measurement source: p007 / article p.4832 · Charge storage mechanism · Figure 7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
two-electrode specific capacitance at 1 A g^-1	55 F g^-1 at 1 A g^-1	—	—	Text Exact Reported	p007 / article p.4832 · Charge storage mechanism · Figure 7b-c
two-electrode cycling stability	92.5% after 1000 cycles at 10 A g^-1	—	—	Text Exact Reported	p007 / article p.4832 · Charge storage mechanism · Figure 7d
positive:negative active-material mass ratio	1:3	—	—	Text Exact Reported	p007 / article p.4832 · Charge storage mechanism · Equation 7