Electrochemistry Application — Conductive Metal-Organic Framework for High Energy Sodium-Ion Hybrid Capacitors

8 measurement groups · 33 results

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

cyclic voltammetry kinetic analysis

Voltammetry

Ni-MOF working electrode · Electrode

CV scan rates 0.1-1 mV s-1 under 0.5-3.0 V; b-value and capacitive contribution analysis.

Temperature: room temperature
Geometry: Ni-MOF Na half-cell
Context: Ni-MOF composite working electrode
Measurement source: 5 · 3.3 Redox Mechanism Analysis · Figure 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
anodic peak b-value at 1.6 V	0.82 at anodic peak (1.6 V)	—	—	Text Exact Reported	5 · 3.3 · Figure 4d
cathodic peak b-value at 0.8 V	0.77 at cathodic peak (0.8 V)	—	—	Text Exact Reported	5 · 3.3 · Figure 4d
b-value range	b-values are between 0.7 and 1.0	—	range 0.7-1.0	Text Range	5 · 3.3 · Figure 4c
capacitive contribution at 0.1 mV s-1	39.3%	—	—	Figure Axis Exact Reported	4 · Figure 4 · Figure 4f
capacitive contribution at 0.2 mV s-1	about 43.3%	—	—	Text Approximate	5 · 3.3 · Figure 4e
capacitive contribution at 0.5 mV s-1	56.1%	—	—	Figure Axis Exact Reported	4 · Figure 4 · Figure 4f
capacitive contribution at 0.8 mV s-1	61.6%	—	—	Figure Axis Exact Reported	4 · Figure 4 · Figure 4f
capacitive contribution at 1 mV s-1Marked as a best value within this paper	65.8%	—	—	Figure Axis Exact Reported	4 · Figure 4 · Figure 4f

electrochemical impedance spectroscopy (EIS)

Impedance spectroscopy

Ni-MOF working electrode · Electrode

EIS at five depths of discharge, 200 kHz to 10 mHz with 5 mV amplitude.

Geometry: Ni-MOF Na half-cell
Context: Ni-MOF composite working electrode
Measurement source: S3 · 1.2 Electrochemical measurements · Figure S8

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
EIS resistance trend	below 0.5 V shows large ohm resistance, charge-transfer resistance, and slow sodium-ion diffusion; ohm resistance changes little overall	—	—	Text Qualitative	4 · 3.3 · Figure S8

electrochemical quartz crystal microbalance with dissipation (EQCM-D)

Ni-MOF quartz sensor electrode film · Thin Film

Two-electrode gas-flow EQCM cell with Ni-MOF quartz sensor working electrode and sodium electrode during discharge.

Geometry: 4.95 MHz AT-cut gold quartz sensor, electrochemically active area 0.785 cm2
Context: Ni-MOF film on quartz sensor
Measurement source: S4 · 1.3 Electrochemical quartz crystal microbalance · Figure S5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
charge-carrier insertion interpretation	only naked sodium-ion was inserted after desolvation during discharge	—	—	Text Qualitative	4 · 3.3 · Figure S5
EQCM mass addition per electronMarked as a best value within this paper	mass addition rate of 23.7 g mol-1 (electrons)	—	—	Text Exact Reported	4 · 3.3 · Figure S5

galvanostatic intermittent titration technique (GITT)

Galvanostatic cycling

Ni-MOF working electrode · Electrode

Na/Ni-MOF cell, 50 mA g-1 for 30 min followed by 2 h rest; performed after first charge/discharge cycle.

Temperature: room temperature
Geometry: Na/Ni-MOF half-cell
Context: Ni-MOF composite working electrode
Measurement source: S9 · Figure S7 caption · Figure S7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Na+ diffusion coefficient above 0.5 VMarked as a best value within this paper	10^-10 to 10^-11 cm2 s-1 above 0.5 V	—	reported as range	Text Range	4 · 3.3 · Figure S7d
diffusion coefficient comparison below 0.5 V	above-0.5 V DNa is 1-2 orders of magnitude larger than below 0.5 V	—	—	Text Qualitative	4 · 3.3 · Figure S7d

GCD cycling/rate tests in Na half-cell

Galvanostatic cycling

Ni-MOF working electrode · Electrode

CR2032 Na half-cells; potential window 0.01-3.0 V versus Na+/Na.

Temperature: room temperature
Atmosphere: cells assembled in Ar-filled glove box
Geometry: standard CR2032-type coin cells with sodium metal counter electrode
Context: Ni-MOF composite working electrode
Measurement source: 3 · 3.2 Sodium Storage Performance · Figure 2d-f

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
capacity at 500 mA g-1, 0.01-3.0 V	about 173 mAh g-1 at 500 mA g-1	—	—	Text Approximate	4 · 3.2 · Figure 2e
specific capacity at 50 mA g-1, 0.01-3.0 VMarked as a best value within this paper	about 517 mAh g-1	—	—	Text Approximate	3 · 3.2 · Figure 2d
capacity retention after 400 cycles at 1 A g-1, 0.01-3.0 V	only 26% after 400 cycles under 1 A g-1	—	—	Text Approximate	4 · 3.2 · Figure 2f

GCD cycling/rate tests in Na half-cell

Galvanostatic cycling

Ni-MOF working electrode · Electrode

CR2032 Na half-cells, 1 M NaClO4 EC:PC/FEC electrolyte; potential window 0.5-3.0 V versus Na+/Na.

Temperature: room temperature
Atmosphere: cells assembled in Ar-filled glove box
Geometry: standard CR2032-type coin cells with sodium metal counter electrode
Context: Ni-MOF composite working electrode
Measurement source: 3 · 3.2 Sodium Storage Performance · Figure 2a-c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
capacity at 500 mA g-1, 0.5-3.0 V	about 202 mAh g-1 at 500 mA g-1	—	—	Text Approximate	4 · 3.2 · Figure 2e
specific capacity at 50 mA g-1, 0.5-3.0 V	about 297 mAh g-1 at 50 mA g-1	—	—	Text Approximate	3 · 3.2 · Figure 2a
capacity after 500 cycles at 1 A g-1	about 145 mAh g-1 after 500 cycles at 1 A g-1	—	—	Text Approximate	3 · 3.2 · Figure 2b
rate capacity at 10 A g-1, 0.5-3.0 VMarked as a best value within this paper	about 107 mAh g-1 at 10 A g-1	—	—	Text Approximate	3 · 3.2 · Figure 2c
capacity retention after 500 cycles at 1 A g-1	about 84%	—	—	Text Approximate	3 · 3.2 · Figure 2b

GCD cycling/rate tests

Galvanostatic cycling

NVOPF/AC positive electrode · Electrode

NVOPF/AC positive electrode between 2.5 and 4.4 V versus Na+/Na.

Temperature: room temperature
Geometry: positive-electrode half-cell
Context: non-MOF NVOPF/AC composite electrode for device context
Measurement source: S14 · Figure S13 caption and paragraph · Figure S13

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
NVOPF/AC capacity at 20 mA g-1Marked as a best value within this paper	approximately 87 mAh g-1 at 20 mA g-1	—	—	Text Approximate	S14 · Figure S13 paragraph · Figure S13a
NVOPF/AC rate capacity at 5 A g-1	about 46 mAh g-1 at 5 A g-1	—	—	Text Approximate	S14 · Figure S13 paragraph · Figure S13b
NVOPF/AC Coulombic efficiency during 2000 cycles	about 100%	—	—	Text Approximate	S14 · Figure S13 paragraph · Figure S13c
NVOPF/AC capacity retention after 2000 cycles	about 87% after 2000 repeated cycles	—	—	Text Approximate	S14 · Figure S13 paragraph · Figure S13c

full-cell CV, GCD, Ragone and cycling tests

Voltammetry Galvanostatic cycling

NVOPF/AC//Ni-MOF SIC full cell · Unknown

NVOPF/AC//Ni-MOF SIC; optimal window 0-3.8 V; energy and power based on total mass of Ni-MOF and NVOPF/AC.

Temperature: room temperature
Atmosphere: Ar-filled glove box assembly
Geometry: three-electrode Swagelok sodium-ion hybrid capacitor
Context: full device using pristine Ni-MOF-derived negative electrode and NVOPF/AC positive electrode
Measurement source: 5 · 3.4 Sodium-Ion Hybrid Capacitor Performance · Figure 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Coulombic efficiency after/during 5000-cycle test	almost 100%	—	—	Text Approximate	5 · 3.4 · Figure 5e
energy density at ultrahigh power	38 Wh kg-1 at 17,309 W kg-1	—	—	Text Exact Reported	5 · 3.4 · Figure 5d
maximum reported device energy densityMarked as a best value within this paper	127 Wh kg-1 at 190 W kg-1	—	—	Text Exact Reported	5 · 3.4 · Figure 5d
ultrahigh power densityMarked as a best value within this paper	17,309 W kg-1	—	—	Text Exact Reported	5 · 3.4 · Figure 5d
Ni-MOF:NVOPF/AC device mass ratio	1:3 (Ni-MOF:NVOPF/AC)	—	—	Text Exact Reported	5 · 3.4
optimal operating voltage windowMarked as a best value within this paper	0-3.8 V	—	—	Text Exact Reported	5 · 3.4 · Figure 5b
power density at 127 Wh kg-1	190 W kg-1	—	—	Text Exact Reported	5 · 3.4 · Figure 5d
capacity retention after 5000 cycles	around 85%	—	—	Text Approximate	5 · 3.4 · Figure 5e