Lukatskaya M.R., Feng D., Bak S.-M. et al. · ACS Nano · 2020 · 15919-15925
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.
NiHAB is presented as an intrinsically conductive MOF electrode material with high gravimetric capacitance relevant to fast-charging supercapacitors.
Caveat: This paper focuses on mechanism and does not report a new first-hand electrical conductivity value for NiHAB.
15919 · Abstract · Linked to 2 structured results
The authors infer that ions do not access NiHAB internal pore space and that through-pores may be absent because adjacent 2D layers could be staggered.
Caveat: This is an inference from cation-size electrochemistry and prior EXAFS, not a direct in situ ion-transport measurement.
15922 · Surface vs Bulk Pseudocapacitance in NiHAB · Figure 2 · Linked to 3 structured results
Electrical double-layer capacitance accounts for only a small fraction of NiHAB capacitance because the measured surface area is low.
Caveat: The EDL calculation uses a high literature areal capacitance assumption rather than a separately measured double-layer capacitance for NiHAB.
15921 · Results and Discussion · Figure S2 · Linked to 3 structured results
Basic electrolyte conditions produce the pronounced redox response, while neutral electrolytes give more rectangular lower-capacitance CVs; the behaviour is controlled by pH/basicity rather than hydroxide anion identity alone.
Caveat: Organic-base comparison uses nonaqueous electrolytes and a slower scan rate, so it supports but does not exactly reproduce the aqueous condition.
15922-15923 · Effect of the pH and Anion and Cation Identity · Figure 3; Figure S6 · Linked to 4 structured results
NiHAB charge storage is ligand-centred rather than Ni-centred; Ni oxidation state does not change during charge/discharge.
Caveat: XAS is insensitive to very small/local changes below the authors' detection and interpretation threshold, but both in situ and steady-state XAS are reported as unchanged.
15919, 15921 · Abstract; Results and Discussion · Figure 1b, Figure 1c · Linked to 3 structured results
The dominant charge-storage mechanism is pH-dependent surface pseudocapacitance at the particle exterior, not bulk ion intercalation through NiHAB pores.
Caveat: The surface-site argument depends on a geometric model of isotropic bicone/spherical particles and crystallographic model assumptions.
15922 · Surface vs Bulk Pseudocapacitance in NiHAB · Figure 2; Figure S5 · Linked to 4 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| NiHAB nickel hexaaminobenzene conductive MOFBrowse family: Ni₃(HAB)₂ / Ni–HAB | Ni3(hexaaminobenzene)2; repeat unit discussed as Ni3C12N12H9Ni, square-planar/four-coordinate local environment; nominal Ni oxidation state estimated as +2.5 · hexaaminobenzene / HAB ligand with quinoid and benzenoid nitrogen environments | 2D · PristineTwo-dimensional conductive metal-organic framework; schematic pore label 13.11 A and effective pore size discussed as 7.4 A; phase purity confirmed by PXRD; staggered interlayer conformation proposed by comparison to prior EXAFS work. | 15921 · Results and Discussion · Figure 1d-1f |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| free-standing NiHAB composite electroderesearch_0809__mat__NiHAB | Electrode · Target Sample · Composite | NiHAB powder, PTFE binder, and carbon black ground with ethanol, dried, kneaded, and rolled into a free-standing film.free-standing film; placed on glassy carbon current collector for electrochemical measurements; on gold current collector for in situ Raman | 15923 · Methods, Electrode Fabrication Procedure |
| NiHAB powderresearch_0809__mat__NiHAB | Powder · Pristine Control · Pristine Framework | Synthesised according to previous reports; phase purity confirmed by XRD; dried at 200 C under reduced pressure before gas sorption. | 15923 · Methods, Electrode Fabrication Procedure · Figure S1 |