Javed A., Strauss I., Bunzen H. et al. · Nanomaterials · 2020 · 1-9
Open a family to keep every result attached to its sample, method and conditions.
Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.
The 95% r.h. conductivity value is likely dominated by continuous liquid water phase formation and should not be used as intrinsic MOF conductivity.
Caveat: Authors explicitly call the 95% r.h. effect bulk water condensation and limit later measurements to 90% r.h.
5 · Results and Discussion · Figure 6 · Linked to 1 structured result
Co-MOF-74 is assigned as the MOF-74/CPO-27-Co framework with Co(II)-dobdc nodes, trigonal R-3 symmetry, and 1D micropores parallel to the crystallographic c axis.
Caveat: The structure figure uses cited crystallographic data rather than a new single-crystal refinement in this paper.
1-2 · Introduction · Figure 1 · Linked to 3 structured results
Co-MOF-74 retains its powder XRD peak positions under humid conditions from 20 C to 60 C at 93% relative humidity.
Caveat: Minor intensity changes of the first diffraction peak are attributed to water occupancy inside the pores.
3-4 · Results and Discussion · Figure 3 · Linked to 2 structured results
Activation dehydrates Co-MOF-74 and reversibly changes the colour from red to black; re-exposure to humid air restores red colour through water coordination at open Co sites.
Caveat: Qualitative observation, not a quantified transport result.
4 · Results and Discussion
Proton conductivity is strongly anisotropic, with much higher conductivity along the micropore c axis than orthogonal to it.
Caveat: The orientation comparison is from one single crystal at 25 C and 92% r.h.
4-5 · Results and Discussion · Figure 4 · Linked to 3 structured results
Low activation energy along the micropore axis supports a Grotthuss-type proton-conduction mechanism involving water molecules inside Co-MOF-74 channels.
Caveat: The 30-60 C c-axis series used a different crystal; orthogonal transport has a higher activation energy attributed to likely H3O+ diffusion through surface sorbate layers.
6-7 · Results and Discussion; Conclusions · Figure 7 · Linked to 2 structured results
The proton conductivity is strongly humidity-dependent and increases roughly exponentially with relative humidity up to 90% r.h.
Caveat: The 95% r.h. point is excluded from intrinsic interpretation because the authors attribute it to bulk water condensation/short-circuiting.
5-6 · Results and Discussion · Figure 6 · Linked to 4 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Co-MOF-74 / CPO-27-CoBrowse family: Co₂(DOBDC) / Co–MOF-74 / CPO-27-Co | Co2(dobdc), dobdc = 2,5-dioxido-1,4-benzenedicarboxylateCo(II) ions; penta-coordinated by linkers in the solvent-free state with an open sixth coordination site toward the pore interior · 2,5-dioxido-1,4-benzenedicarboxylate, prepared from 2,5-dihydroxy-terephthalic acid (DHBDC) | 3D · PristineMOF-74 honeycomb framework; trigonal space group 148, R-3; linear 1D micropores with ca. 1.1 nm hexagonal cross-section running parallel to the crystallographic c axis. | 1-2 · Introduction · Figure 1 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Co-74_1 single crystalresearch_0232__mat__co_mof_74 | Single Crystal · Target Sample · Pristine Framework | Activated Co-MOF-74 single crystal used for orientation-dependent impedance at 25 C and 92% r.h.Interdigitated Pt electrode array | 3 · Supplementary Material · Table S3 |
| Co-74_2 single crystalresearch_0232__mat__co_mof_74 | Single Crystal · Target Sample · Pristine Framework | Activated Co-MOF-74 single crystal measured along c axis at 21 C under variable humidity.Interdigitated Pt electrode array | 3 · Supplementary Material · Table S3 |
| Co-74_3 single crystalresearch_0232__mat__co_mof_74 | Single Crystal · Target Sample · Pristine Framework | Activated Co-MOF-74 single crystal measured along c axis at 90% r.h. over 22-30 C.Interdigitated Pt electrode array | 3 · Supplementary Material · Table S3 |
| Co-74_4 single crystalresearch_0232__mat__co_mof_74 | Single Crystal · Target Sample · Pristine Framework | Activated Co-MOF-74 single crystal measured orthogonal to the c axis at 90% r.h. over 21-30 C.Interdigitated Pt electrode array | 3 · Supplementary Material · Table S3 |
| Co-74_5 single crystalresearch_0232__mat__co_mof_74 | Single Crystal · Target Sample · Pristine Framework | Activated Co-MOF-74 single crystal measured along c axis under variable humidity at 30 C and at 90% r.h. from 30-60 C.Interdigitated Pt electrode array | 3 · Supplementary Material · Table S3 |
| Co-MOF-74 powder sampleresearch_0232__mat__co_mof_74 | Powder · Target Sample · Pristine Framework | Powder from the solvothermal Co-MOF-74 preparation; IR measured under humid air and temperature-resolved XRPD measured at 93% relative humidity. | 2-4 · Materials and Methods; Results and Discussion · Figures 2c, 3 |
| large Co-MOF-74 single crystalsresearch_0232__mat__co_mof_74 | Single Crystal · Target Sample · Pristine Framework | Solvothermally prepared, washed, solvent-exchanged with MeOH, dried under reduced pressure, and activated under vacuum at 160 C overnight before transport testing.Interdigitated Pt electrodes for impedance measurements | 1, 2-4 · Abstract; Materials and Methods; Results and Discussion · Figures 2, 4-7 |