Lai Y., Xiao L., Tao Y. et al. · ChemSusChem · 2021 · 1830-1834
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.
NiFe-HXR is stable during OER chronoamperometry, losing only about 1.5 percent current density over 25 h.
Caveat: Post-stability SEM/XRD support is qualitative from figures/text.
1833 · Electrocatalytic properties · Figure 2h; Figures S8-S9 referenced · Linked to 6 structured results
The paper is transport-relevant but does not report direct electrical conductivity, mobility or thermoelectric measurements; EIS is used as the charge-transfer proxy.
Caveat: Conductive-MOF evidence is mechanistic and electrochemical, not four-probe or device conductivity.
1832 · Electrocatalytic properties · Figure 2e · Linked to 1 structured result
Ni-HXR, Fe-HXR and NiFe-HXR were successfully synthesised as HXR MOF phases because their PXRD patterns match the simulated pattern.
Caveat: CIF and detailed crystallographic table are absent, so formulas and cell parameters cannot be independently verified.
1831 · Results and discussion · Figure 1f and Figure S2 referenced · Linked to 2 structured results
Bimetallic NiFe-HXR outperforms monometallic Ni-HXR, Fe-HXR, derived NiFeOx and commercial IrO2 for OER overpotential and intrinsic activity.
Caveat: Electrochemical results are application metrics rather than standalone bulk electronic conductivity data.
1832-1833 · Electrocatalytic properties and summary · Figure 2 · Linked to 6 structured results
Fe incorporation causes electron transfer from Ni to Fe species, modulating Ni-centre electron density and promoting OER.
Caveat: XPS shifts support electronic interaction, but the mechanistic assignment is interpretive.
1833 · XPS characterisation · Figure 3 · Linked to 2 structured results
The chain-based coordination bonds provide a through-bond pathway, while cofacial terminal-ligand pi-pi stacking provides through-space charge transport, improving one-dimensional charge-carrier efficiency.
Caveat: The paper infers transport enhancement from structural motifs and electrochemical impedance in an OER cell rather than reporting direct electronic conductivity.
1831-1832 · Results and electrocatalytic properties · Figure 1d and Figure 2e · Linked to 2 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Fe-HXR | Not specifiedFe nodes in a monometallic HXR MOF analogue · 4,4'-bipyridine / 4,4'-bpy | 1D · PristineAs-prepared Fe-HXR XRD pattern matches the simulated pattern of the HXR framework family; detailed structure is not provided in the main text. | 1831 · Results and discussion · Figure S2 referenced |
| commercial IrO2 | IrO2Ir oxide benchmark | unknown · UnknownCommercial IrO2 electrocatalyst benchmark. | 1832 · Electrocatalytic properties · Figure 2 |
| Ni0.2Fe0.8-HXR | Ni0.2Fe0.8-HXRMixed Ni/Fe nodes with nominal Ni/Fe ratio 0.2:0.8 · 4,4'-bipyridine / 4,4'-bpy | 1D · PristineBimetallic HXR ratio-control analogue; synthesis details are provided in the SI. | SI p. 2 · 1.1 Synthesis of NiFe-HXR |
| Ni0.8Fe0.2-HXR | Ni0.8Fe0.2-HXRMixed Ni/Fe nodes with nominal Ni/Fe ratio 0.8:0.2 · 4,4'-bipyridine / 4,4'-bpy | 1D · PristineBimetallic HXR ratio-control analogue; synthesis details are provided in the SI. | SI p. 2 · 1.1 Synthesis of NiFe-HXR |
| Ni-HXR | Not specifiedNi sites coordinated by water and 4,4'-bipyridine; monometallic Ni chain-based MOF · 4,4'-bipyridine / 4,4'-bpy | 1D · PristineC2/c single-crystal structure; 1D metal complex bridged by 4,4'-bpy along the b axis, with hydrogen-bonded 3D supramolecular packing and cofacial terminal-ligand pi-pi stacking. | 1831 · Results and discussion · Figure 1a-d |
| NiFe-HXR | Not specifiedMixed Ni/Fe nodes in a bimetallic chain-based MOF; optimal Ni/Fe molar ratio reported as 1:1 · 4,4'-bipyridine / 4,4'-bpy | 1D · PristineBimetallic chain-based MOF isomorphous with Ni-HXR, combining through-bond chain transport and through-space cofacial ligand stacking; hexagonal nanorod morphology. | 1830-1831 · Introduction and results · Figure 1 |
| NiFeOx | NiFeOxNi and Fe in mixed-metal oxide after high-temperature pyrolysis | unknown · DerivedDerived mixed-metal oxide generated by high-temperature pyrolysis of NiFe-HXR. | SI p. 2 · 1.1 Synthesis of NiFe-HXR · Figure S3/Figure S6 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Fe-HXR hexagonal nanorodsresearch_0668__mat__mat_fe_hxr | Powder · Pristine Control · Pristine Framework | As-prepared monometallic Fe-HXR made by the same SI procedure as NiFe-HXR, omitting Ni(NO3)2.6H2O. | SI p. 2 · 1.1 Synthesis of NiFe-HXR · Figure S2 |
| commercial IrO2 benchmarkresearch_0668__mat__mat_iro2 | Powder · Pristine Control · Unknown | Commercial benchmark electrocatalyst. | 1832 · Electrocatalytic properties · Figure 2 |
| Ni0.2Fe0.8-HXRresearch_0668__mat__mat_ni02fe08_hxr | Powder · Pristine Control · Mixed Metal | Bimetallic HXR ratio-control sample prepared by the SI NiFe-HXR procedure with Ni/Fe = 0.2 : 0.8. | SI p. 2 · 1.1 Synthesis of NiFe-HXR · Figure S5 |
| Ni0.8Fe0.2-HXRresearch_0668__mat__mat_ni08fe02_hxr | Powder · Pristine Control · Mixed Metal | Bimetallic HXR ratio-control sample prepared by the SI NiFe-HXR procedure with Ni/Fe = 0.8 : 0.2. | SI p. 2 · 1.1 Synthesis of NiFe-HXR · Figure S5 |
| Ni-HXR hexagonal nanorodsresearch_0668__mat__mat_ni_hxr | Powder · Pristine Control · Pristine Framework | Hydrothermally prepared hexagonal nanorods; detailed workup not available without SI. | 1831 · Results and discussion · Figure 1e-f |
| NiFe-HXR hexagonal nanorodsresearch_0668__mat__mat_nife_hxr | Powder · Target Sample · Mixed Metal | Hydrothermally prepared bimetallic chain-based MOF; optimal Ni/Fe molar ratio 1:1. | 1830-1832 · Introduction and electrocatalytic properties · Figure 1 and Figure 2 |
| NiFeOx derived oxideresearch_0668__mat__mat_nifeox | Powder · Pristine Control · Unknown | NiFe-HXR heated at 500 C for 2 h under air with a 2 C min-1 ramp. | SI p. 2 · 1.1 Synthesis of NiFe-HXR · Figure S3/Figure S6 |