Park J., Lee M., Feng D. et al. · Journal of the American Chemical Society · 2018 · 10315-10323
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.
Co-HAB-D preserves charge transport at high active mass loading, giving nearly linear areal-capacity scaling up to 2.6 mAh cm^-2 at 9.6 mg cm^-2.
Caveat: Areal-capacity comparisons to literature anodes in Table S3 are contextual and not extracted as first-hand rows except for Co-HAB-D.
main p.10320 · Results and Discussion · Fig. 4 · Linked to 3 structured results
Discharging Co-HAB below 0.5 V to 0.05 V vs Na+/Na causes poor retention and likely framework destruction through over-reduction of Co(II).
Caveat: The Co(0)/framework-destruction pathway is proposed rather than directly proven in the extracted text.
main p.10319 · Results and Discussion · Fig. S9; Scheme S1c · Linked to 2 structured results
Co-HAB is assigned as a 2D eclipsed hexagonal honeycomb conductive MOF rather than a staggered/nonporous structure.
Caveat: The SI states ab initio structure determination from PXRD was not possible due to insufficient and broadened peaks; assignment combines Pawley fitting, DFT model, HRTEM and porosity.
main p.10317 · Results and Discussion · Fig. 1; Table S1 · Linked to 5 structured results
Higher crystallinity and larger particle size in Co-HAB correlate with higher bulk electrical conductivity, with Co-HAB-D reaching 1.57 S cm^-1.
Caveat: Some intermediate conductivities are read from plotted axes rather than printed values.
main p.10318 · Results and Discussion · Fig. 2e,f · Linked to 4 structured results
Adding NH4OH after pre-mixing Co(II) salt and HAB avoids Co(OH)2 impurity formation observed in the base-first route.
Caveat: Evidence is qualitative PXRD comparison in Fig. S1.
main p.10317 · Results and Discussion · Fig. S1
The sodium-storage redox activity is centred on HAB linkers, while Co remains divalent and provides an immobilising/conductive framework bridge.
Caveat: Conclusion is based on ex situ XPS peak changes and analogy to related metal-o-phenyldiamine complexes.
main p.10321 · Results and Discussion · Fig. 5e,f · Linked to 3 structured results
The high intrinsic conductivity of pristine Co-HAB-D enables high-rate sodium storage with only 5 wt% carbon additive and even observable carbon-free capacity.
Caveat: Electrochemical electrodes are composites; the carbon-free electrode still likely contains binder, and exact carbon-free formulation is not fully specified.
main p.10320 · Results and Discussion · Fig. 3; Fig. S10 · Linked to 4 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Co-HAB cobalt hexaaminobenzene 2D conductive MOFBrowse family: Co₃(HAB)₂ / Co–HAB | Not reported as a simple empirical formula; cobalt-based HAB coordination framework.Co(II) centres in square-planar coordination units · Hexaaminobenzene (HAB; used as HAB.3HCl precursor) | 2D · PristineEclipsed hexagonal honeycomb 2D framework; Pawley-refined P6/mmm hexagonal unit cell, with 1D channels along rod-like crystals. | main pp.10316-10317 · Results and Discussion · Fig. 1 |
| Ni-HAB nickel hexaaminobenzene conductive MOF comparison sampleBrowse family: Ni₃(HAB)₂ / Ni–HAB | Not reportedNi centres; exact oxidation/coordination not specified here · Hexaaminobenzene (HAB) | 2D · PristineAssumed analogous conductive MOF platform; detailed structure not extracted from this paper. | main p.10321 · Results and Discussion · Fig. S12 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Co-HAB-A10research_0004__mat__co_hab | Powder · Pristine Control · Pristine Framework | Aqueous Co-HAB sample prepared with 10 equiv NH4OH; cold-isostatically pressed for conductivity where applicable.Pellet thickness 200-300 um for conductivity measurement. | SI p.S5 · Optimization of Co-HAB synthesis · Fig. S2; Fig. S3 |
| Co-HAB-A3research_0004__mat__co_hab | Powder · Pristine Control · Pristine Framework | Aqueous synthesis with about 3 equiv NH4OH; low-yield amorphous product. | main p.10318 · Results and Discussion · Fig. 2c |
| Co-HAB-A4research_0004__mat__co_hab | Powder · Pristine Control · Pristine Framework | Aqueous Co-HAB sample prepared with 4 equiv NH4OH; cold-isostatically pressed for conductivity where applicable.Pellet thickness 200-300 um for conductivity measurement. | main p.10318 · Results and Discussion · Fig. 2; Fig. 3c |
| Co-HAB-A aqueous synthesis seriesresearch_0004__mat__co_hab | Powder · Target Sample · Pristine Framework | Aqueous synthesis in open air, washed with water/acetone and vacuum-dried. | SI p.S5 · Optimization of Co-HAB synthesis · Fig. S2; Fig. S3 |
| Base-first Co-HAB synthesis product with Co(OH)2 impurityresearch_0004__mat__co_hab | Powder · Pristine Control · Unknown | Metal salt and NH4OH mixed before HAB addition; product filtered, washed and dried. | main p.10317 · Results and Discussion · Fig. S1 |
| Carbon-free Co-HAB-D electroderesearch_0004__mat__co_hab | Electrode · Composite Sample · Composite | Electrode without carbon conductive additive; exact binder composition not stated in text layer.Cu foil current collector; Na metal counter/reference | main p.10320 · Results and Discussion · Fig. S10 |
| Co-HAB-D optimised mixed-solvent productresearch_0004__mat__co_hab | Powder · Target Sample · Pristine Framework | DMF/water mixed-solvent synthesis, open air, 75 C, washed and vacuum-dried. | main p.10318 · Results and Discussion · Fig. 2 |
| Pressed Co-HAB-D pelletresearch_0004__mat__co_hab | Pellet · Target Sample · Pristine Framework | Cold-isostatically pressed pellet, evacuated before four-point-probe measurement.glass slide during measurement · 200-300 um thickness; 3.175 mm diameter | SI p.S9 · Electrical conductivity measurement · Fig. S6 |
| High-mass-loading Co-HAB-D electroderesearch_0004__mat__co_hab | Electrode · Composite Sample · Composite | High loading electrodes prepared with PTFE binder instead of PVDF in the same 90:5:5 mass ratio.Cu foil current collector; Na metal counter/reference in 2032 coin cell · Active mass loading series 1.3-9.6 mg cm^-2; 4.4 mg cm^-2 rate electrode also reported. | main p.10321 · Experimental Section · Fig. 4 |
| Co-HAB sodium electrode tested with 0.05 V lower cutoffresearch_0004__mat__co_hab | Electrode · Composite Sample · Composite | Sodium cell cycled with lower discharge cutoff at 0.05 V vs Na+/Na.Na half-cell | main p.10319 · Results and Discussion · Fig. S9; Scheme S1c |
| DFT-optimised eclipsed Co-HAB structural modelresearch_0004__mat__co_hab | Model · Model System · Model | Geometry optimised by DFT and refined by Pawley fitting against synchrotron PXRD. | main p.10317 · Results and Discussion · Fig. 1c,e; Table S1 |
| Drop-cast Co-HAB film on quartzresearch_0004__mat__co_hab | Thin Film · Target Sample · Pristine Framework | As-synthesised Co-HAB dispersed in water and drop-cast; water evaporated before UV-Vis-NIR measurement.quartz substrate | SI p.S8 · UV-Vis-NIR spectrum of Co-HAB · Fig. S5 |
| Standard Co-HAB-D sodium half-cell electroderesearch_0004__mat__co_hab | Electrode · Composite Sample · Composite | Co-HAB powder, carbon black and PVDF binder slurry coated on Cu foil and dried at 70 C overnight under vacuum.Cu foil current collector; Na metal counter/reference in 2032 coin cell · 1 cm2 circular disks; typical mass 1-1.5 mg | main p.10321 · Experimental Section |
| Ni-HAB sodium half-cell electroderesearch_0004__mat__ni_hab | Electrode · Pristine Control · Composite | Electrochemical conditions stated to be identical to those used for Co-HAB.Na half-cell | main p.10321 · Results and Discussion · Fig. S12 |