Abbas B., Ravindra A.V. · Molecular Catalysis · 2025 · 115025
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.
Pristine U is the better HER electrocatalyst, with lower overpotential, lower Tafel slope, and stronger HER stability than U-N.
Caveat: HER performance is measured on carbon/PVDF/nickel-foam composite electrodes rather than neat MOF films.
9 · 3.7.2 Hydrogen evolution reaction (HER) · Fig. 8; Table 3 · Linked to 5 structured results
U-N is the better OER electrocatalyst, showing lower OER overpotential and lower OER Tafel slope than U.
Caveat: OER comparison was made at 20 mA/cm2 rather than the common 10 mA/cm2 criterion because of the nickel-foam oxidation feature and U-N behaviour after the oxidation peak.
8 · 3.7.1 Oxygen evolution reaction (OER) · Fig. 7; Table 2 · Linked to 4 structured results
The SI post-reaction XRD comparison suggests U-N maintains the main 7.3 deg MOF peak better than U after water splitting.
Caveat: Post-reaction XRD conclusion is qualitative; rendered SI confirms the figure exists, but numeric peak intensities are not reported.
2 · XRD before and after the water-splitting process · Fig. S1 · Linked to 2 structured results
Amino functionalisation in U-N retains the fundamental UiO-66 crystal structure and phase while changing XRD peak intensity.
Caveat: Simulated UiO-66 CIF 4512072 was not supplied as a local document.
4 · 3.1 XRD · Fig. 1 · Linked to 2 structured results
The paper attributes U's superior HER behaviour to larger BET surface area, larger pore volume, and smaller average pore size relative to U-N.
Caveat: Mechanistic attribution is correlative; no independent adsorption-energy or intrinsic conductivity measurement is reported.
9 · 3.7.2 Hydrogen evolution reaction (HER) · Table 1; Fig. 8 · Linked to 7 structured results
Amino functionalisation lowers the optical band gap and is associated with enhanced electronic conductivity and charge-transfer characteristics in U-N.
Caveat: No direct four-probe electrical conductivity measurement is reported; conductivity is inferred from band gap, XPS valence/conduction-band discussion, CV/ECSA, and EIS behaviour.
6, 12 · 3.6 XPS; 3.7.4 CV and EIS · Fig. 6f; Fig. 10d · Linked to 4 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| nano UiO-66 (U) | Zr6O4(OH)4(C8H4O4)6Zr6O4(OH)4 zirconium clusters / SBUs · terephthalic acid / BDC | 3D · PristineUiO-type Zr MOF; XRD peaks match simulated UiO-66 pattern and are indexed to (111), (200), (220), (400), (442), (533), (551), (771), (971), and (991). | 2, 5 · Introduction; 3.6 XPS · Fig. 1 |
| nano UiO-66-NH2 (U-N) | Zr6O4(OH)4(C8H3NO4)6Zr6O4(OH)4 zirconium clusters / SBUs · 2-aminoterephthalic acid / BDC-NH2 | 3D · PristineAmino-functionalised UiO-66 framework; XRD retains the UiO phase and FTIR/XPS confirm amine/nitrogen functionality. | 2, 5 · Introduction; 3.6 XPS · Fig. 1; Fig. 6 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| U catalyst-coated nickel foam electroderesearch_0355__mat__uio66 | Electrode · Composite Sample · Composite | Catalyst ink from active U sample, conductive carbon black, PVDF, and NMP applied to both sides of nickel foam over 1 x 1 cm2; expected mass increase 5-6 mg.nickel foam · nickel foam thickness 1.5 mm | 3 · 2.4 Electrochemical studies |
| UiO-66 powder, labelled Uresearch_0355__mat__uio66 | Powder · Pristine Control · Pristine Framework | Solvothermally synthesised, centrifuged, washed, dried, activated at 100 C for 24 h, finely ground; white powder. | 3 · 2.2 Synthesis |
| U post-water-splitting SI electroderesearch_0355__mat__uio66 | Electrode · Composite Sample · Composite | SI re-synthesised working electrode paste from U active sample and PVDF in NMP; dried for 8 h before repeated electrochemistry and XRD.nickel foam | 2 · XRD before and after the water-splitting process · Fig. S1; Fig. S2 |
| U-N catalyst-coated nickel foam electroderesearch_0355__mat__uio66_nh2 | Electrode · Composite Sample · Composite | Catalyst ink from active U-N sample, conductive carbon black, PVDF, and NMP applied to both sides of nickel foam over 1 x 1 cm2; expected mass increase 5-6 mg.nickel foam · nickel foam thickness 1.5 mm | 3 · 2.4 Electrochemical studies |
| UiO-66-NH2 powder, labelled U-Nresearch_0355__mat__uio66_nh2 | Powder · Target Sample · Pristine Framework | Solvothermally synthesised, centrifuged, washed, dried, activated at 100 C for 24 h, finely ground; yellow powder. | 3 · 2.2 Synthesis |
| U-N post-water-splitting SI electroderesearch_0355__mat__uio66_nh2 | Electrode · Composite Sample · Composite | SI re-synthesised working electrode paste from U-N active sample and PVDF in NMP; dried for 8 h before repeated electrochemistry and XRD.nickel foam | 2 · XRD before and after the water-splitting process · Fig. S1; Fig. S2 |