Electrical Transport — Humidity-mediated anisotropic proton conductivity through the 1d channels of co-mof-74

8 measurement groups · 42 results

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

Arrhenius analysis of proton conductivity

Electrical conductivity

large Co-MOF-74 single crystals · Single Crystal

Linear regression of ln(T sigma) versus T^-1 at 90% r.h.; activation energies reported for c-axis and orthogonal transport.

Context: pristine_framework
Measurement source: 6 · Results and Discussion · Figure 7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
activation energy along c axis, 21-30 C	EA = 0.37 eV	—	—	Text Exact Reported	6 · Results and Discussion · Figure 7
activation energy along c axis, 30-60 CMarked as a best value within this paper	EA = 0.32 eV	—	—	Text Exact Reported	6-7 · Results and Discussion; Conclusions · Figure 7
activation energy orthogonal direction, 21-30 C	EA = 0.87 eV	—	—	Text Exact Reported	6 · Results and Discussion · Figure 7

AC impedance-derived proton conductivity

Electrical conductivity Impedance spectroscopy

Co-74_1 single crystal · Single Crystal

25 C, 92% r.h.; current direction along c axis and orthogonal to c axis.

Context: pristine_framework
Measurement source: 4-5 · Results and Discussion · Figure 4; Figure 5; Table S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
conductivity anisotropy factor at 25 C and 92% r.h.	123 / 11.7 = 10.5	—	—	Calculated From Reported Rounded Reported	4-5 · Results and Discussion · Figure 4; Table S3
frequency-independent dc plateau along c axis	ca. 100 uS cm^-1	0.0001 S cm^-1	—	Text Approximate	5 · Results and Discussion · Figure 5
frequency-independent dc plateau orthogonal to c axis	ca. 10 uS cm^-1	0.00001 S cm^-1	—	Text Approximate	5 · Results and Discussion · Figure 5
proton conductivity, Co-74_1 along c axis, 25 C, 92% r.h.Marked as a best value within this paper	123 uS cm^-1; direction =; T=25 C; r.h.=92%	0.00012299999999999998 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_1 orthogonal to c axis, 25 C, 92% r.h.	11.7 uS cm^-1; direction not equal; T=25 C; r.h.=92%	0.000011699999999999998 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3

AC impedance-derived proton conductivity

Electrical conductivity Impedance spectroscopy

Co-74_2 single crystal · Single Crystal

21 C; along c axis; relative humidity varied from 75% to 90%.

Context: pristine_framework
Measurement source: 5-6 · Results and Discussion · Figure 6; Table S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
proton conductivity, Co-74_2 along c axis, 21 C, 75% r.h.	0.732 uS cm^-1; direction =; T=21 C; r.h.=75%	7.319999999999999e-7 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_2 along c axis, 21 C, 80% r.h.	2.29 uS cm^-1; direction =; T=21 C; r.h.=80%	0.00000229 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_2 along c axis, 21 C, 85% r.h.	7.38 uS cm^-1; direction =; T=21 C; r.h.=85%	0.00000738 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_2 along c axis, 21 C, 90% r.h.	20.4 uS cm^-1; direction =; T=21 C; r.h.=90%	0.000020399999999999998 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3

AC impedance-derived proton conductivity

Electrical conductivity Impedance spectroscopy

Co-74_3 single crystal · Single Crystal

Along c axis; 90% r.h.; temperature varied from 22 C to 30 C.

Context: pristine_framework
Measurement source: 6 · Results and Discussion · Figure 7; Table S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
proton conductivity, Co-74_3 along c axis, 22 C, 90% r.h.	34.4 uS cm^-1; direction =; T=22 C; r.h.=90%	0.000034399999999999996 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_3 along c axis, 26 C, 90% r.h.	45.5 uS cm^-1; direction =; T=26 C; r.h.=90%	0.000045499999999999995 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_3 along c axis, 30 C, 90% r.h.	49.6 uS cm^-1; direction =; T=30 C; r.h.=90%	0.0000496 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3

AC impedance-derived proton conductivity

Electrical conductivity Impedance spectroscopy

Co-74_4 single crystal · Single Crystal

Orthogonal to c axis; 90% r.h.; temperature varied from 21 C to 30 C.

Context: pristine_framework
Measurement source: 6 · Results and Discussion · Figure 7; Table S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
proton conductivity, Co-74_4 orthogonal to c axis, 21 C, 90% r.h.	0.862 uS cm^-1; direction not equal; T=21 C; r.h.=90%	8.62e-7 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_4 orthogonal to c axis, 24 C, 90% r.h.	1.46 uS cm^-1; direction not equal; T=24 C; r.h.=90%	0.00000146 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_4 orthogonal to c axis, 27 C, 90% r.h.	1.85 uS cm^-1; direction not equal; T=27 C; r.h.=90%	0.00000185 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_4 orthogonal to c axis, 30 C, 90% r.h.	2.4 uS cm^-1; direction not equal; T=30 C; r.h.=90%	0.0000024 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3

AC impedance-derived proton conductivity

Electrical conductivity Impedance spectroscopy

Co-74_5 single crystal · Single Crystal

Along c axis; humidity series at 30 C and temperature series at 90% r.h. from 30 C to 60 C.

Context: pristine_framework
Measurement source: 5-6 · Results and Discussion · Figure 6; Figure 7; Table S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
proton conductivity, Co-74_5 along c axis, 30 C, 70% r.h.	0.27 uS cm^-1; direction =; T=30 C; r.h.=70%	2.7e-7 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_5 along c axis, 30 C, 75% r.h.	1.18 uS cm^-1; direction =; T=30 C; r.h.=75%	0.00000118 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_5 along c axis, 30 C, 80% r.h.	4.48 uS cm^-1; direction =; T=30 C; r.h.=80%	0.00000448 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_5 along c axis, 30 C, 85% r.h.	15.7 uS cm^-1; direction =; T=30 C; r.h.=85%	0.0000157 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_5 along c axis, 30 C, 90% r.h.	49.8 uS cm^-1; direction =; T=30 C; r.h.=90%	0.0000498 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_5 along c axis, 30 C, 95% r.h.	2590 uS cm^-1; direction =; T=30 C; r.h.=95%	0.00259 S cm^-1	—	SI Table Rounded Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_5 along c axis, 40 C, 90% r.h.	52.3 uS cm^-1; direction =; T=40 C; r.h.=90%	0.0000523 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_5 along c axis, 50 C, 90% r.h.	77.7 uS cm^-1; direction =; T=50 C; r.h.=90%	0.0000777 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3
proton conductivity, Co-74_5 along c axis, 60 C, 90% r.h.	137 uS cm^-1; direction =; T=60 C; r.h.=90%	0.000137 S cm^-1	—	SI Table Exact Reported	3 · Supplementary Material · Table S3

Equivalent-circuit fitting of Nyquist spectra

Impedance spectroscopy

Co-74_1 single crystal · Single Crystal

25 C, 92% r.h.; single crystal measured along and orthogonal to micropore axis; resistor plus constant phase element model.

Context: pristine_framework
Measurement source: 2 · Supplementary Material · Table S2; Figure S3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
equivalent-circuit chi-squared, along micropore axis	0.015	—	—	SI Table Exact Reported	2 · Supplementary Material · Table S2
equivalent-circuit chi-squared, orthogonal to axis	0.014	—	—	SI Table Exact Reported	2 · Supplementary Material · Table S2
constant phase element P, along micropore axis	0.88579	—	—	SI Table Exact Reported	2 · Supplementary Material · Table S2
constant phase element P, orthogonal to axis	0.89969	—	—	SI Table Exact Reported	2 · Supplementary Material · Table S2
constant phase element T, along micropore axis	1.8753x10^-11	—	—	SI Table Exact Reported	2 · Supplementary Material · Table S2
constant phase element T, orthogonal to axis	1.4715x10^-11	—	—	SI Table Exact Reported	2 · Supplementary Material · Table S2
fit resistance R, along micropore axis	1.278x10^7 ohm	—	—	SI Table Exact Reported	2 · Supplementary Material · Table S2
fit resistance R, orthogonal to axis	2.072x10^7 ohm	—	—	SI Table Exact Reported	2 · Supplementary Material · Table S2

AC impedance spectroscopy, Solartron SI 1260 and Novocontrol Alpha-A

Impedance spectroscopy

large Co-MOF-74 single crystals · Single Crystal

Single crystal on interdigitated Pt electrodes; dry N2 humidified through water; temperature/humidity verified by Sensirion SHT2x; 12 h equilibration after condition changes.

Context: pristine_framework
Measurement source: 3-4 · Materials and Methods; Results and Discussion · Figures 4-7

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Pt electrode spacing	20 um electrode spacing	—	—	Text Exact Reported	3 · Materials and Methods
Pt electrode width	20 um electrode width	—	—	Text Exact Reported	3 · Materials and Methods
condition equilibration time	12 h after each change	—	—	Text Exact Reported	3 · Materials and Methods
impedance frequency upper bound	1 MHz	—	—	Text Exact Reported	4 · Results and Discussion · Figure 4
impedance frequency lower bound	10 Hz	—	—	Text Exact Reported	4 · Results and Discussion · Figure 4
applied potential	0.1 V	—	—	Text Exact Reported	4 · Results and Discussion · Figure 4