Hwang S., Lee E.J., Song D. et al. · ACS Applied Materials and Interfaces · 2018 · 35354-35660
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.
pH-controlled Co-MOF-74 crystals retain structural integrity after H2SO4/NH4OH treatments and humid exposure, as supported by NMR/PXRD and N2/BET data.
Caveat: PXRD/NMR and isotherm evidence are figure/table-level characterisation; no CIF refinement for treated samples is included in the supplied documents.
p003 / journal page 35356 · Results and Discussion · Linked to 3 structured results
Co-MOF-74 single crystals show highly directional proton migration along isolated 1D c-axis channels.
Caveat: Directional interpretation is based on axis-specific single-crystal EIS; authors note possible cracks or metal-ion-mediated transport may contribute to a-axis conductivity.
p001 / journal page 35354 · Abstract · Linked to 3 structured results
c-axis single-crystal conductivities are much higher than pellet conductivities, with a maximum reported c/pellet ratio of 46667.
Caveat: Authors state direct comparison between single crystals and pellets may not be fully valid because pellet data can include extrinsic interparticle transport.
p005 / journal page 35358 · Results and Discussion · Linked to 1 structured result
Acid and base treatments increase c-axis conductivity mainly through increased proton-carrier concentration in the channels; base-treated samples may support base-catalysed proton transfer.
Caveat: Carrier concentration is inferred from pH treatment and conductivity trends; no direct carrier count is reported.
p004 / journal page 35357 · Results and Discussion · Equation 1 · Linked to 3 structured results
Very low c-axis activation energies, especially 0.12 eV for pH 11, are attributed to high proton mobility through isolated channels via directional Grotthuss proton transfer.
Caveat: The Grotthuss assignment is mechanistic interpretation supported by Arrhenius values and simple geometric modelling, not direct observation of proton hopping.
p005 / journal page 35358 · Conclusions · Linked to 2 structured results
The maximum c-axis/a-axis proton-conductivity anisotropy is approximately 1200-fold, with Table 2 reporting 1235 at pH 11 and 30 deg C.
Caveat: The abstract/conclusion round this as approximately 1200-fold; the table gives the exact reported ratio.
p003 / journal page 35356 · Results and Discussion · Table 2 · Linked to 1 structured result
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Co-MOF-74Browse family: Co₂(DOBDC) / Co–MOF-74 / CPO-27-Co | Co-MOF-74; Co2(dobdc)-type framework, exact empirical formula not reported in this paperCo2+ open-metal-site nodes · 2,5-dioxido-1,4-benzenedicarboxylate / DOBDC-derived linker | 3D · PristineMOF-74/CPO-27-type framework with isolated one-dimensional channels aligned along the crystallographic c-axis and separated by framework walls. | p001 / journal page 35354 · Introduction |
| Co-MOF-74 geometric water-chain model | Co-MOF-74 framework model with pore-filling H2O moleculesCo2+ nodes from MOF-74 crystal structure · DOBDC-derived linker from MOF-74 crystal structure | 3D · Model SystemSimple geometric model of coordinated and pore-filling water molecules in Co-MOF-74 channels. | S-13 · Section S9 · Figures S8-S9 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| pH 11 NH4OH-treated Co-MOF-74 crystals before electrode configurationresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | pH 11 NH4OH-treated | p003 / journal page 35356 · Results and Discussion |
| pH 11 NH4OH-treated Co-MOF-74 pelletresearch_0380__mat__co_mof74 | Pellet · Target Sample · Guest Loaded | Slightly ground pH-controlled crystals pressed into a pellet and contacted on flat sides.pellet EIS: A=0.4072 cm2; l=6.9 x10^-2 cm | S-6 · Section S2 / Electrodes connection to pellets |
| pH 11 NH4OH-treated Co-MOF-74 single crystal, a-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (100) or (010) surface connected for [100]/a-axis impedance measurement.FTO glass with conductive silver epoxy · a-axis EIS: A=11.264 x10^-5 cm2; l=1.08 x10^-2 cm | S-6 · Section S2 / Microelectrodes connection |
| pH 11 NH4OH-treated Co-MOF-74 single crystal, c-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (001) end surfaces connected for [001]/c-axis impedance measurement.flat slide glass during electrode connection · c-axis EIS: A=1.52 x10^-5 cm2; l=3.86 x10^-2 cm | S-7 · Section S4 · Table S2 |
| pH 3 H2SO4-treated Co-MOF-74 crystals before electrode configurationresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | pH 3 H2SO4-treated | p003 / journal page 35356 · Results and Discussion |
| pH 3 H2SO4-treated Co-MOF-74 pelletresearch_0380__mat__co_mof74 | Pellet · Target Sample · Guest Loaded | Slightly ground pH-controlled crystals pressed into a pellet and contacted on flat sides.pellet EIS: A=0.4072 cm2; l=5.1 x10^-2 cm | S-6 · Section S2 / Electrodes connection to pellets |
| pH 3 H2SO4-treated Co-MOF-74 single crystal, a-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (100) or (010) surface connected for [100]/a-axis impedance measurement.FTO glass with conductive silver epoxy · a-axis EIS: A=6.712 x10^-5 cm2; l=0.93 x10^-2 cm | S-6 · Section S2 / Microelectrodes connection |
| pH 3 H2SO4-treated Co-MOF-74 single crystal, c-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (001) end surfaces connected for [001]/c-axis impedance measurement.flat slide glass during electrode connection · c-axis EIS: A=3.579 x10^-5 cm2; l=2.41 x10^-2 cm | S-7 · Section S4 · Table S2 |
| pH 5 H2SO4-treated Co-MOF-74 crystals before electrode configurationresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | pH 5 H2SO4-treated | p003 / journal page 35356 · Results and Discussion |
| pH 5 H2SO4-treated Co-MOF-74 pelletresearch_0380__mat__co_mof74 | Pellet · Target Sample · Guest Loaded | Slightly ground pH-controlled crystals pressed into a pellet and contacted on flat sides.pellet EIS: A=0.4072 cm2; l=5.8 x10^-2 cm | S-6 · Section S2 / Electrodes connection to pellets |
| pH 5 H2SO4-treated Co-MOF-74 single crystal, a-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (100) or (010) surface connected for [100]/a-axis impedance measurement.FTO glass with conductive silver epoxy · a-axis EIS: A=8.832 x10^-5 cm2; l=0.73 x10^-2 cm | S-6 · Section S2 / Microelectrodes connection |
| pH 5 H2SO4-treated Co-MOF-74 single crystal, c-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (001) end surfaces connected for [001]/c-axis impedance measurement.flat slide glass during electrode connection · c-axis EIS: A=3.642 x10^-5 cm2; l=3.28 x10^-2 cm | S-7 · Section S4 · Table S2 |
| pH 7 H2O-coordinating Co-MOF-74 crystals before electrode configurationresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | pH 7 H2O-coordinating | p003 / journal page 35356 · Results and Discussion |
| pH 7 H2O-coordinating Co-MOF-74 pelletresearch_0380__mat__co_mof74 | Pellet · Target Sample · Guest Loaded | Slightly ground pH-controlled crystals pressed into a pellet and contacted on flat sides.pellet EIS: A=0.4072 cm2; l=7.5 x10^-2 cm | S-6 · Section S2 / Electrodes connection to pellets |
| pH 7 H2O-coordinating Co-MOF-74 single crystal, a-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (100) or (010) surface connected for [100]/a-axis impedance measurement.FTO glass with conductive silver epoxy · a-axis EIS: A=14.62 x10^-5 cm2; l=0.88 x10^-2 cm | S-6 · Section S2 / Microelectrodes connection |
| pH 7 H2O-coordinating Co-MOF-74 single crystal, c-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (001) end surfaces connected for [001]/c-axis impedance measurement.flat slide glass during electrode connection · c-axis EIS: A=3.84 x10^-5 cm2; l=4.65 x10^-2 cm | S-7 · Section S4 · Table S2 |
| pH 9 NH4OH-treated Co-MOF-74 crystals before electrode configurationresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | pH 9 NH4OH-treated | p003 / journal page 35356 · Results and Discussion |
| pH 9 NH4OH-treated Co-MOF-74 pelletresearch_0380__mat__co_mof74 | Pellet · Target Sample · Guest Loaded | Slightly ground pH-controlled crystals pressed into a pellet and contacted on flat sides.pellet EIS: A=0.4072 cm2; l=6.7 x10^-2 cm | S-6 · Section S2 / Electrodes connection to pellets |
| pH 9 NH4OH-treated Co-MOF-74 single crystal, a-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (100) or (010) surface connected for [100]/a-axis impedance measurement.FTO glass with conductive silver epoxy · a-axis EIS: A=12.475 x10^-5 cm2; l=0.98 x10^-2 cm | S-6 · Section S2 / Microelectrodes connection |
| pH 9 NH4OH-treated Co-MOF-74 single crystal, c-axis EIS geometryresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Guest Loaded | Flat (001) end surfaces connected for [001]/c-axis impedance measurement.flat slide glass during electrode connection · c-axis EIS: A=2.897 x10^-5 cm2; l=3.19 x10^-2 cm | S-7 · Section S4 · Table S2 |
| as-synthesised pristine Co-MOF-74 crystalsresearch_0380__mat__co_mof74 | Single Crystal · Target Sample · Pristine Framework | As-synthesised pristine Co-MOF-74 containing coordinated DMF prior to coordination exchange.large single crystals approximately 100 x 600 um2 in a- and c-axes (main text) | S-5 · Section S2 / Synthesis of Co-MOF-74 |
| geometric model of pore-filling H2O in Co-MOF-74 channelsresearch_0380__mat__co_mof74_model | Model · Model System · Model | 2D geometric model based on MOF-74 crystal structure and typical H2O hydrogen-bond O-O distance. | S-13 · Section S9 · Figures S8-S9 |