Electrical Transport — Vapor-Induced Superionic Conduction of Magnesium Ions in a Metal-Organic Framework

6 measurement groups · 19 results

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

AC impedance spectroscopy under MeOH vapour

Impedance spectroscopy

Mg-MOF-74 superset {Mg(TFSI)2}x loading series · Powder

Prepared Mg-MOF-74 superset {Mg(TFSI)2}x samples measured under MeOH vapour after dehydration.

Temperature: 298
Atmosphere: MeOH vapour
Geometry: compressed pellet with porous silver electrodes
Context: salt-loading dependence
Measurement source: p006 / SI p.S6 · Ionic Conductivity and Mg2+ Transport · Figure S7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
MeOH-vapour conductivity increases with Mg(TFSI)2 loading	ionic conductivity clearly increases with increasing amount of incorporated Mg(TFSI)2	—	—	Text Qualitative	p006 / SI p.S6 · Ionic Conductivity and Mg2+ Transport · Figure S7
Approximate conductivity of x = 0.07 under MeOH vapour	about 2.5 x 10-6 S cm-1 at 25 deg C from SI Figure S7	0.00025 S m-1	visual estimate from SI plot	Figure Axis Approximate	p006 / SI p.S6 · Supporting Information · Figure S7
Approximate conductivity of x = 0.13 under MeOH vapour	about 4 x 10-5 S cm-1 at 25 deg C from SI Figure S7	0.004 S m-1	visual estimate from SI plot	Figure Axis Approximate	p006 / SI p.S6 · Supporting Information · Figure S7

AC impedance spectroscopy, two-probe method, Solartron 1260/1296A, 1 Hz to 10 MHz

Electrical conductivity Impedance spectroscopy

Mg-MOF-74 superset {Mg(TFSI)2}0.15 · Powder

Compressed powder pellet with two porous silver electrodes in a home-made sealed cell; dried under N2 at 130 deg C overnight; measured under dry N2 or anhydrous guest vapours from N2 bubbling over solvents, 19-34 deg C.

Temperature: 292-307
Atmosphere: dry N2; MeOH, EtOH, MeCN, THF, PC, and DEC vapours carried by dry N2
Geometry: compressed pellet, 3 mm diameter, around 0.5 mm thick, two porous Ag electrodes
Context: target Mg(TFSI)2-loaded MOF
Measurement source: p003 / article p.21126 · Ionic Conductivity Measurements · Figure 3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Activation energy under MeOH vapour	0.26 eV	0.26 eV	—	Text Rounded Reported	p004 / article p.21127 · Ionic Conductivity and Mg2+ Transport · Figure 3
DEC and PC vapours did not enhance ionic conductivity	DEC and PC did not show such enhancement under the measurement condition	—	—	Text Qualitative	p004 / article p.21127 · Ionic Conductivity and Mg2+ Transport · Figure 3
Approximate ionic conductivity under DEC vapour from Figure 3	about 2.5 x 10-9 S cm-1 at 25 deg C from log(sigma) near -8.6	2.5e-7 S m-1	visual estimate from plotted axis	Figure Axis Approximate	p004 / article p.21127 · Ionic Conductivity and Mg2+ Transport · Figure 3
Ionic conductivity of x = 0.15 under EtOH vapour at 25 deg C	4.9 x 10-5 S cm-1 at 25 deg C	0.0049 S m-1	—	Text Rounded Reported	p004 / article p.21127 · Ionic Conductivity and Mg2+ Transport · Figure 3
Ionic conductivity of x = 0.15 under MeCN vapour at 25 deg C	4.6 x 10-5 S cm-1 at 25 deg C	0.0046 S m-1	—	Text Rounded Reported	p004 / article p.21127 · Ionic Conductivity and Mg2+ Transport · Figure 3
Ionic conductivity of x = 0.15 under MeOH vapour at 25 deg CMarked as a best value within this paper	2.6 x 10-4 S cm-1 at 25 deg C	0.026 S m-1	—	Text Rounded Reported	p004 / article p.21127 · Ionic Conductivity and Mg2+ Transport · Figure 3
Ionic conductivity of x = 0.15 under dry N2 at 25 deg C	1.5 x 10-9 S cm-1 at 25 deg C	1.5e-7 S m-1	—	Text Rounded Reported	p004 / article p.21127 · Ionic Conductivity and Mg2+ Transport · Figure 3
Approximate ionic conductivity under PC vapour from Figure 3	about 1.3 x 10-9 S cm-1 at 25 deg C from log(sigma) near -8.9	1.3e-7 S m-1	visual estimate from plotted axis	Figure Axis Approximate	p004 / article p.21127 · Ionic Conductivity and Mg2+ Transport · Figure 3
Approximate ionic conductivity under THF vapour from Figure 3	about 1 x 10-6 S cm-1 at 25 deg C from log(sigma) near -6	0.0001 S m-1	visual estimate from plotted axis	Figure Axis Approximate	p004 / article p.21127 · Ionic Conductivity and Mg2+ Transport · Figure 3

AC impedance spectroscopy under various vapours

Impedance spectroscopy

Mg-MOF-74 superset {Mg(TFSI)2}x, x = 0 blank · Powder

Blank x = 0 sample measured under various vapours as a control; details follow the same dehydration and sealed-cell impedance protocol.

Temperature: 298
Atmosphere: various vapours, including protic MeOH
Geometry: compressed pellet with porous silver electrodes
Context: pristine Mg-MOF-74 vapour control
Measurement source: p005 / SI p.S5 · Ionic Conductivity and Mg2+ Transport · Figure S6

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Approximate x = 0 conductivity under MeOH vapour from SI Figure S6	about 7 x 10-7 S cm-1 at 25 deg C from log(sigma) near -6.15	0.00007 S m-1	visual estimate from SI plot	Figure Axis Approximate	p005 / SI p.S5 · Supporting Information · Figure S6
x = 0 blank conductivity under vapours	below 10-6 S cm-1	0.0001 S m-1	upper bound	Text Range	p005 / SI p.S5 · Ionic Conductivity and Mg2+ Transport · Figure S6

Repeated AC impedance measurements under guest vapours and dry N2

Impedance spectroscopy

Mg-MOF-74 superset {Mg(TFSI)2}0.15 · Powder

Reproducibility tested by repeating impedance measurements under guest vapours and under N2 after dehydration at 130 deg C overnight at 25 deg C; durability followed under organic vapour.

Temperature: 298
Atmosphere: MeOH, MeCN, THF vapours and dry N2
Geometry: compressed pellet sealed-cell impedance
Context: target Mg(TFSI)2-loaded MOF
Measurement source: p005 / article p.21128 · Ionic Conductivity and Mg2+ Transport · Figure 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Vapour-induced ionic conductivity durability	durable for at least a week	604800 s	at least	Text Range	p005 / article p.21128 · Ionic Conductivity and Mg2+ Transport · Figure 5a
Vapour-induced conductivity reproducibility	completely reproducible	—	—	Text Qualitative	p005 / article p.21128 · Ionic Conductivity and Mg2+ Transport · Figure 5b

AC impedance conductivity measurement of Mg(TFSI)2 salt control

Electrical conductivity Impedance spectroscopy

Mg(TFSI)2 salt control · Powder

Mg(TFSI)2 control measured under selected guest vapours; MeOH, EtOH, and MeCN conditions could not be measured because of salt deliquescence.

Atmosphere: guest vapours including THF; MeOH, EtOH, and MeCN attempted but not measurable
Context: non-MOF salt control
Measurement source: p006 / SI p.S6 · Ionic Conductivity and Mg2+ Transport · Figure S8

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Mg(TFSI)2 control did not show drastic vapour enhancement	Mg(TFSI)2 itself did not show such a drastic enhancement of ionic conduction by guest vapors (e.g., THF)	—	—	Text Qualitative	p006 / SI p.S6 · Ionic Conductivity and Mg2+ Transport · Figure S8
Mg(TFSI)2 control not measurable under MeOH, EtOH, MeCN	could not be measured because of deliquescence of Mg(TFSI)2	—	—	Text Qualitative	p005 / article p.21128 · Ionic Conductivity and Mg2+ Transport
Approximate Mg(TFSI)2 salt conductivity under THF vapour	about 6 x 10-10 S cm-1 at 25 deg C from SI Figure S8	6e-8 S m-1	visual estimate from SI plot	Figure Axis Approximate	p006 / SI p.S6 · Supporting Information · Figure S8

Nyquist impedance plots under dry N2 and organic vapours

Impedance spectroscopy

Mg-MOF-74 superset {Mg(TFSI)2}0.15 · Powder

Example Nyquist plots at 25 deg C for x = 0.15 under MeOH, EtOH, MeCN, THF, DEC, PC, and N2.

Temperature: 298
Atmosphere: MeOH, EtOH, MeCN, THF, DEC, PC, and dry N2
Geometry: compressed pellet sealed-cell impedance
Context: target Mg(TFSI)2-loaded MOF
Measurement source: p004 / SI p.S4 · Supporting Information · Figure S5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source