Electrical Transport — Particle size dependence of proton conduction in a cationic lanthanum phosphonate MOF

6 measurement groups · 22 results

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

AC impedance proton conductivity under varied pelletisation torque

Electrical conductivity Impedance spectroscopy

beta-PCMOF21-Br torque-control pellet · Pellet

Equal portions of beta-PCMOF21-Br equilibrated 3 days at 85 deg C and 95% RH under 0.2-0.5 N m, then increased by 0.05 N m and equilibrated another 3 days before measurement.

Temperature: 358
Atmosphere: air, 95% RH
Geometry: pellet sample holders, torque-varied compression
Context: representative pristine PCMOF21-series bromide framework
Measurement source: p003 / journal page 4024 · Proton conductivity torque measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
proton conductivity at 20 cN m torque	0.000181 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 1
proton conductivity at 25 cN m torque	0.000148 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 1
proton conductivity at 30 cN m torque	0.000198 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 1
proton conductivity at 35 cN m torque	0.000243 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 1
proton conductivity at 40 cN m torqueMarked as a best value within this paper	0.00429 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 1
proton conductivity at 45 cN m torque	0.00163 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 1
proton conductivity at 50 cN m torque	0.00117 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 1
proton conductivity at 55 cN m torque	0.000539 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 1
Nyquist semicircle changes with pelletisation pressure	varying pelletisation pressure changed the magnitude of the first semicircle feature	—	—	Text Qualitative	p005 / journal page 4026 · Proton conduction by particle size · Figure 4

AC impedance proton conductivity, second cycle

Electrical conductivity Impedance spectroscopy

as-synthesised PCMOF21-AcO bulk powder · Powder

As-synthesised unsieved powder; 85 deg C, 95% RH, air, 0.4 N m; second cycle result in Table 2.

Temperature: 358
Atmosphere: air, 95% RH
Geometry: 2-probe titanium-electrode pellet cell
Context: pristine framework
Measurement source: p005 / journal page 4026 · Proton conduction by particle size · Table 2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
activation energy	0.001 eV	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2
Arrhenius best-fit R2	0.338	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2
proton conductivity at 85 deg C and 95% RH	1.27 x 10-3 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2

AC electrochemical impedance spectroscopy on Princeton Applied Research VersaSTAT3

Impedance spectroscopy

as-synthesised PCMOF21-AcO bulk powder · Powder

Air, 95% RH, humidity-controlled ESPEC BTL-433 oven; 25-85 deg C in 10 deg C / 24 h increments; samples loaded as-is in custom dual-sample 2-probe cell with titanium electrodes; 0.4 N m torque; two heating/cooling cycles; 1 MHz to 1 Hz and reverse.

Temperature: 298-358
Atmosphere: air, 95% RH
Geometry: custom dual-sample 2-probe titanium-electrode cell, assumed 3.175 mm diameter corrected by callipers
Context: pristine PCMOF21-AcO powder/pellet
Measurement source: p002 / journal page 4023 · Proton conductivity measurements

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
conductivity trend over temperature sweep	conductivity increases with temperature; >=210 um fraction remains highest across the plotted range	—	—	Figure Axis Qualitative	p006 / journal page 4027 · Proton conduction by particle size · Figure 8

AC impedance proton conductivity, second cycle

Electrical conductivity Impedance spectroscopy

PCMOF21-AcO >210 um particle fraction · Pellet

>210 um sieved fraction; 85 deg C, 95% RH, air, 0.4 N m; second cycle result in Table 2.

Temperature: 358
Atmosphere: air, 95% RH
Geometry: 2-probe titanium-electrode pellet cell
Context: pristine framework
Measurement source: p005 / journal page 4026 · Proton conduction by particle size · Table 2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
activation energy	0.003 eV	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2
Arrhenius best-fit R2	0.334	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2
proton conductivity at 85 deg C and 95% RHMarked as a best value within this paper	3.08 x 10-3 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2

AC impedance proton conductivity, second cycle

Electrical conductivity Impedance spectroscopy

PCMOF21-AcO <38 um particle fraction · Pellet

<38 um sieved fraction; 85 deg C, 95% RH, air, 0.4 N m; second cycle result in Table 2.

Temperature: 358
Atmosphere: air, 95% RH
Geometry: 2-probe titanium-electrode pellet cell
Context: pristine framework
Measurement source: p005 / journal page 4026 · Proton conduction by particle size · Table 2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
activation energy	0.001 eV	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2
Arrhenius best-fit R2	0.359	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2
proton conductivity at 85 deg C and 95% RH	1.12 x 10-3 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2

AC impedance proton conductivity, second cycle

Electrical conductivity Impedance spectroscopy

PCMOF21-AcO 125 <= x < 180 um particle fraction · Pellet

125 <= x < 180 um sieved fraction; 85 deg C, 95% RH, air, 0.4 N m; second cycle result in Table 2.

Temperature: 358
Atmosphere: air, 95% RH
Geometry: 2-probe titanium-electrode pellet cell
Context: pristine framework
Measurement source: p005 / journal page 4026 · Proton conduction by particle size · Table 2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
activation energy	0.001 eV	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2
Arrhenius best-fit R2	0.367	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2
proton conductivity at 85 deg C and 95% RH	1.44 x 10-3 S cm-1	—	—	Table Exact Reported	p005 / journal page 4026 · Proton conduction by particle size · Table 2