Xu J., Zhu X., Jia X. · ACS Sustainable Chemistry and Engineering · 2019 · 16629-16639
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 hierarchical (U+S)-CoFe-MOF is the best OER electrocatalyst among the three CoFe-MOFs, with lower overpotential, lower Tafel slope, lower charge-transfer resistance and better stability.
Caveat: Activity is application electrochemistry on MOF/Nafion/GCE electrodes; no standalone electronic conductivity was measured.
10 · Conclusions · Linked to 7 structured results
The paper discusses charge transfer and mass transport during OER but does not report a direct electrical conductivity, mobility, Seebeck coefficient or thermoelectric measurement for the MOF.
Caveat: This is an extraction caveat based on full main/SI reading.
1 · Abstract · Linked to 2 structured results
(U+S)-CoFe-MOF has enhanced structural stability in water, NMP and OER cycling, attributed to removal of unstable domains and retention of more crystalline framework regions.
Caveat: Post-OER surface oxidation/hydroxide formation is observed, so stability is not a claim of chemically unchanged surface speciation.
8-9 · Results and Discussion · Figure 6 · Linked to 4 structured results
The two-step method is presented as general for monometal, bimetal and trimetal 2D MOFs, with Ni-MOF, NiV-MOF and NiCoFe-MOF examples showing increased surface area or obvious mesopores after solvothermal treatment.
Caveat: The assigned documents do not provide detailed synthesis recipes or electrochemical performance for these generality examples.
6 · Results and Discussion · Figure 4; Figures S6-S8 · Linked to 3 structured results
Ultrasound synthesis followed by solvothermal treatment etches unstable CoFe-MOF domains, creating hierarchical mesopores while retaining ultrathin 2D morphology and improving crystallinity.
Caveat: Mechanistic conclusion is inferred from ex situ TGA/UV-vis/ICP/XPS and microscopy, not from in situ observation.
6 · Results and Discussion · Figure 3 · Linked to 4 structured results
Hierarchical pores concentrate OH- at exposed boundaries and improve electrolyte mass transport/access to active sites relative to a smooth microporous CoFe-MOF surface.
Caveat: The 160-fold concentration enhancement is computational and model-dependent.
9 · Results and Discussion · Figure 7 · Linked to 3 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Bimetallic CoFe-MOF nanosheets | Co/Fe 1,4-benzenedicarboxylate MOF; exact empirical formula not reported.Co and Fe metal ions/octahedral metal centres; Co and Fe contents measured by ICP. · Benzenedicarboxylic acid / BDC linker. | 2D · PristineIsostructural to reported NiCo-based MOFs; assigned C2/m with XRD reflections (200), (001), (201), and (-201). | 4 · Results and Discussion · Figure 2a |
| Ni-MOF nanosheets | Nickel MOF; exact linker/formula not reported in assigned documents.Ni metal nodes. · not reported | 2D · PristineUltrasonically generated Ni-MOF before and after solvothermal treatment; mesoporous network after treatment. | 6 · Results and Discussion · Figure 4a-c; Figure S6 |
| NiCoFe-MOF nanosheets | Nickel-cobalt-iron MOF; exact linker/formula not reported in assigned documents.Ni, Co and Fe metal nodes. · not reported | 2D · PristineTrimetal MOF nanosheets with abundant mesopores after the two-step treatment. | 6 · Results and Discussion · Figure S8 |
| NiV-MOF nanosheets | Nickel-vanadium MOF; exact linker/formula not reported in assigned documents.Ni and V metal nodes. · not reported | 2D · PristineBimetallic NiV-MOF nanosheets; mesopores are created after solvothermal treatment. | 6 · Results and Discussion · Figure 4d-f; Figure S7 |
| Commercial RuO2 electrocatalyst control | RuO2Ru oxide | unknown · Model SystemCommercial non-MOF OER benchmark. | 7 · Results and Discussion · Figure 5 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Commercial RuO2 comparison electroderesearch_0489__mat__ruo2_control | Electrode · Model System · Model | Commercial RuO2 benchmark; exact electrode preparation not separately described.Glassy carbon electrode, inferred same OER comparison context | 7 · Results and Discussion · Figure 5; Figure 6 |
| S-CoFe-MOF on glassy carbon electroderesearch_0489__mat__cofe_mof | Electrode · Pristine Control · Composite | MOF ink in ethanol/water/Nafion drop-cast on polished GC electrode and dried for 15 min.Glassy carbon electrode, 3 mm diameter | 3 · Electrochemical Characterizations |
| S-CoFe-MOF direct-solvothermal nanosheetsresearch_0489__mat__cofe_mof | Nanosheet · Pristine Control · Mixed Metal | Direct solvothermal reaction of the raw materials at 140 degC for 48 h.much thicker layers than U and (U+S) samples | 3 · Experimental Section · Figure S2 |
| U-CoFe-MOF on glassy carbon electroderesearch_0489__mat__cofe_mof | Electrode · Pristine Control · Composite | MOF ink in ethanol/water/Nafion drop-cast on polished GC electrode and dried for 15 min.Glassy carbon electrode, 3 mm diameter | 3 · Electrochemical Characterizations |
| U-CoFe-MOF ultrasound-only nanosheetsresearch_0489__mat__cofe_mof | Nanosheet · Pristine Control · Mixed Metal | Ultrasonically shocked 40 kHz reaction for 8 h with the same raw material ratio; no solvothermal post-treatment.similar to (U+S)-CoFe-MOF; Figure S1 labelled about 1.3 nm | 3 · Experimental Section · Figure 1e; Figure S1 |
| U-Ni-MOF ultrasonic controlresearch_0489__mat__ni_mof | Nanosheet · Pristine Control · Pristine Framework | Ultrasonically generated Ni-MOF before solvothermal treatment; detailed recipe not reported. | 6 · Results and Discussion · Figure 4a-c |
| U-NiCoFe-MOF ultrasonic controlresearch_0489__mat__nicofe_mof | Nanosheet · Pristine Control · Mixed Metal | Ultrasonically prepared NiCoFe-MOF before solvothermal treatment; detailed recipe not reported. | 5 · Supporting Information · Figure S8 |
| U-NiV-MOF ultrasonic controlresearch_0489__mat__niv_mof | Nanosheet · Pristine Control · Mixed Metal | Ultrasonically generated NiV-MOF before solvothermal treatment; detailed recipe not reported. | 6 · Results and Discussion · Figure 4d-f |
| (U+S)-CoFe-MOF on glassy carbon electroderesearch_0489__mat__cofe_mof | Electrode · Target Sample · Composite | MOF ink in ethanol/water/Nafion drop-cast on polished GC electrode and dried for 15 min.Glassy carbon electrode, 3 mm diameter | 3 · Electrochemical Characterizations |
| (U+S)-CoFe-MOF COMSOL model electroderesearch_0489__mat__cofe_mof | Model · Model System · Model | Gouy-Chapman-Stern/Nernst-Planck-Poisson model in 1 M KOH.model electrode surface | 3 · COMSOL Calculation · Figure 7 |
| (U+S)-CoFe-MOF hierarchical nanosheetsresearch_0489__mat__cofe_mof | Nanosheet · Target Sample · Mixed Metal | Ultrasound-assisted CoFe-MOF synthesis followed by solvothermal treatment at 140 degC for 48 h, centrifuged, washed and freeze-dried.1.3 nm nanosheets | 3 · Experimental Section · Figure 1 |
| (U+S)-Ni-MOF hierarchical nanosheetsresearch_0489__mat__ni_mof | Nanosheet · Target Sample · Pristine Framework | Ultrasonically generated Ni-MOF followed by solvothermal treatment; detailed recipe not reported. | 4 · Supporting Information · Figure S6 |
| (U+S)-NiCoFe-MOF hierarchical nanosheetsresearch_0489__mat__nicofe_mof | Nanosheet · Target Sample · Mixed Metal | Ultrasonically prepared NiCoFe-MOF followed by solvothermal treatment; detailed recipe not reported. | 5 · Supporting Information · Figure S8 |
| (U+S)-NiV-MOF hierarchical nanosheetsresearch_0489__mat__niv_mof | Nanosheet · Target Sample · Mixed Metal | Ultrasonically generated NiV-MOF followed by solvothermal treatment; detailed recipe not reported. | 5 · Supporting Information · Figure S7 |