Hod I., Deria P., Bury W. et al. · Nature Communications · 2015 · 8304
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.
NU-1000_Ni-S substantially accelerates acidic HER relative to MOF-free Ni-S and FTO controls, reaching 10 mA cm-2 at 238 mV overpotential.
Caveat: Best value was the lowest observed across several electrodes; values ranged up to 280 mV.
7 · Discussion · Figure 4 · Linked to 4 structured results
NU-1000_Ni-S maintains activity and framework crystallinity during a 2 h acidic HER stability test, with no UV-vis evidence of linker leaching.
Caveat: Stability was demonstrated only over roughly 2 h under the reported conditions.
4-5 · Results - HER catalysis · Figure 5; Supplementary Figure 8 · Linked to 4 structured results
The electrodeposited Ni-S in NU-1000_Ni-S is primarily Ni3S2, with weaker evidence for NiS2/NiS and amorphous character by PXRD.
Caveat: PXRD shows no crystalline Ni-S peaks; assignment relies on Raman plus EDS/ICP ratios.
3 · Results - Electrocatalyst synthesis · Supplementary Figure 5; Supplementary Table 1 · Linked to 4 structured results
The catalytic enhancement is not primarily caused by increased electroactive surface area or improved interfacial electron transfer.
Caveat: The claim is based on CV capacitance, EIS and microscopy evidence; microscopic active-site distribution remains inferred.
5, 7 · Results - Origins; Discussion · Figures 3 and 6 · Linked to 3 structured results
The NU-1000_Ni-S HER kinetics are consistent with a Tafel slope near 120 mV dec-1, implying Volmer-step-limited HER in the authors' mechanistic framing.
Caveat: The paper says the hybrid probably catalyses via Volmer-Tafel, while SI Note 1 says the near-120 mV dec-1 slope implies Volmer limitation; Tafel-slope interpretation is conditional.
12-13 · Supplementary Note 1 · Linked to 1 structured result
Terminal hydroxo/aquo ligands on NU-1000 Zr6 nodes are important for proton conductivity and for the HER enhancement in the hybrid.
Caveat: The exact microscopic proton-delivery mechanism remains unresolved by the authors.
6 · Results - Origins · Figures 7-9 · Linked to 5 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Au, Au_Ni-S and Au_NU-1000_Ni-S control electrodes | gold electrode controls with optional Ni-S and NU-1000_Ni-SAu substrate; optional Zr6 NU-1000 nodes and Ni-S · TBAPy4- where NU-1000 is present | unknown · Model SystemAlternative-substrate HER controls. | 11 · Supplementary Figure 14 · Supplementary Figure 14 |
| benzoate-modified NU-1000 | NU-1000 with ca. four benzoates per Zr6 nodeZr6 nodes with benzoate replacing terminal OH/OH2 ligands · TBAPy4- linkers plus node-bound benzoate ligands | 3D · PristineBenzoate-coordinated NU-1000 variant retaining MOF morphology and inter-rod spacing. | 6 · Results - Origins of enhanced catalytic performance · Figure 7 |
| benzoate-modified NU-1000_Ni-S hybrid | benzoate-modified FTO_NU-1000 with electrodeposited Ni-SZr6 benzoate-modified NU-1000 nodes plus nickel sulfide · TBAPy4- and benzoate ligands | 3D · CompositeComposite control electrode with Ni-S on benzoate-modified NU-1000. | 6 · Results - Origins of enhanced catalytic performance · Figure 8 |
| bare FTO electrode | fluorine-doped tin oxide | unknown · Model SystemConductive glass substrate control. | 4 · Results - HER catalysis · Figure 4 |
| FTO_Ni-S | FTO-supported electrodeposited Ni-SNickel sulfide on FTO | unknown · CompositeMOF-free Ni-S film electrodeposited directly on FTO. | 4 · Results - HER catalysis · Figure 4 |
| electrodeposited Ni-S | Ni3S2 primary product with minor NiS2/NiS signaturesNickel sulfide phase, not a MOF | unknown · DerivedAmorphous electrodeposited nickel sulfide; Raman/elemental analysis assign Ni3S2 as the main product. | 3 · Results - Electrocatalyst synthesis · Supplementary Figure 5; Supplementary Table 1 |
| NU-1000 | Zr6(mu3-O)4(mu3-OH)4(OH)4(OH2)4 with TBAPy4- linkersHexa-zirconium oxo/hydroxo/aquo Zr6 nodes bearing terminal OH and OH2 ligands · 1,3,6,8-tetrakis(p-benzoate)pyrene (TBAPy4-) | 3D · PristineMesoporous NU-1000 framework with triangular and hexagonal one-dimensional channels; acid-stable Zr6-based MOF scaffold. | 2-3 · Results - Electrocatalyst synthesis · Figure 1 |
| NU-1000_Ni-S hybrid | FTO-supported NU-1000 with electrodeposited Ni-S/Ni3S2Zr6 NU-1000 nodes plus electrodeposited nickel sulfide · TBAPy4- linkers in NU-1000 | 3D · CompositeComposite electrode in which Ni-S deposits mainly as a flat layer at/between NU-1000 rods rather than as Ni-S rods throughout the MOF channels. | 3 · Results - Electrocatalyst synthesis · Figures 2-3 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Au substrate HER control seriesresearch_0859__mat__mat_au_controls | Electrode · Model System · Model | Bare Au, Au_Ni-S and Au_NU-1000_Ni-S electrodes compared by J-V.Au | 11 · Supplementary Figure 14 · Supplementary Figure 14 |
| bare FTOresearch_0859__mat__mat_fto | Electrode · Pristine Control · Model | Untreated bare conductive substrate control.FTO glass | 4 · Results - HER catalysis · Figure 4 |
| benzoate-modified FTO_NU-1000research_0859__mat__mat_benzoate_nu1000 | Electrode · Pristine Control · Guest Loaded | As-synthesised NU-1000 film with coordinated benzoate modulators; HCl activation omitted.FTO glass | 7 · Methods - Growth of NU-1000 thin films |
| benzoate-modified NU-1000_Ni-Sresearch_0859__mat__mat_benzoate_nu1000_nis | Electrode · Composite Sample · Composite | Ni-S electrodeposited on benzoate-modified NU-1000.benzoate-modified FTO_NU-1000 | 6 · Results - Origins of enhanced catalytic performance · Figure 8 |
| benzoate-modified NU-1000 pelletresearch_0859__mat__mat_benzoate_nu1000 | Pellet · Pristine Control · Guest Loaded | Disk pellet with silver epoxy contacts and tin-coated copper wires, humidified with H2O vapour.3 mm pellet thickness; 7 mm diameter | 7 · Methods - Proton conductivity measurements · Figure 9 |
| FTO_Ni-Sresearch_0859__mat__mat_fto_nis | Electrode · Composite Sample · Composite | Ni-S electrodeposited directly on FTO without MOF scaffold.bare FTO | 4 · Results - HER catalysis · Figure 4 |
| FTO_NU-1000research_0859__mat__mat_nu1000 | Electrode · Pristine Control · Pristine Framework | Solvothermally grown NU-1000 thin film on FTO, acid-activated to remove benzoate modulators.FTO glass, 15 ohm sq-1, 2.5 x 1.25 cm | 7 · Methods - Growth of NU-1000 thin films |
| bulk NU-1000research_0859__mat__mat_nu1000 | Powder · Pristine Control · Pristine Framework | Bulk NU-1000 used for N2 adsorption/porosity context. | 2 · Results - Electrocatalyst synthesis |
| NU-1000_Ni-Sresearch_0859__mat__mat_nu1000_nis | Electrode · Target Sample · Composite | Ni-S electrodeposited for 2 min unless otherwise stated; hybrid HER electrocatalyst.FTO-supported NU-1000 | 2-3 · Results - Electrocatalyst synthesis · Figures 2-3 |
| NU-1000 pelletresearch_0859__mat__mat_nu1000 | Pellet · Target Sample · Pristine Framework | Pressed disk pellet with silver epoxy contacts and tin-coated copper wires, humidified with H2O vapour.3 mm pellet thickness; 7 mm diameter | 7 · Methods - Proton conductivity measurements · Figure 9 |