Zhu Q., Wang J., Liu X. et al. · Angewandte Chemie - International Edition · 2020 · 16579-16586
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.
In situ XRD found no crystalline Li2S, Na2S, or S8 formation during electrochemical conversion, supporting maintained amorphous <Na2MoS4> rather than crystalline side-product formation.
Caveat: XRD would be insensitive to amorphous side products or phases below detection limits.
5 (16583) · Results and Discussion · Figure 4 · Linked to 1 structured result
Extraction of the second Na cation at high voltage is irreversible and leads to rapid capacity loss and signs of elemental sulfur redox.
11 · Figure S7 caption · Figure S7 · Linked to 1 structured result
The dehydrated <Na2MoS4> target is best described as a Na-rich amorphous coordination polymer/framework rather than a confirmed single crystalline phase.
Caveat: Authors state that further studies are required and possible co-existence of several phases cannot be excluded.
3 (16581) · Results and Discussion · Linked to 3 structured results
The intrinsic electronic conductivity of dehydrated <Na2MoS4> is sufficient to operate carbon-free Li half-cell electrodes with substantial capacity.
Caveat: Adding Super P improves active-material utilisation and increases capacity to about 460 mAh g-1.
7 (16585) · Results and Discussion · Figure 6 · Linked to 3 structured results
Charge storage involves combined Mo cationic redox and sulfide/disulfide anionic redox, with predominant sulfide redox above 2 V and Mo redox at lower potentials.
Caveat: Li/Na cation exchange occurs in Li half-cells, so exact alkali content could not be determined from XPS.
7 (16585) · Conclusion · Figure 3 · Linked to 5 structured results
<Na2MoS4> and Na2MoS4.3.5H2O are mixed ionic-electronic conductors; dehydrated <Na2MoS4> has dominant measurable electronic conduction.
Caveat: Direct ionic conductivity of dehydrated <Na2MoS4> was not separately measured and is inferred from electrochemical performance and EIS behaviour.
7 (16585) · Conclusion · Linked to 4 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| ammonium tetrathiomolybdate precursor | (NH4)2MoS4Mo in tetrathiomolybdate anions | unknown · UnknownNeedle-like red crystalline precursor used for sodium salt synthesis. | 2 · Experimental Section, (NH4)2MoS4 synthesis |
| sodium molybdate air-exposure product | Na2MoO4Mo | unknown · DerivedPXRD product assigned to Na2MoO4 after ambient exposure of dehydrated Na2MoS4. | 8 · Figure S4 caption · Figure S4 |
| dehydrated sodium tetrathiomolybdate amorphous coordination framework | <Na2MoS4>Mo in tetrathiomolybdate units with mixed Mo valence | unknown · PristineAmorphous coordination polymer/framework composed of MoS4 units connected by ionic or coordination bonds and covalent disulfide bonds; single phase not fully confirmed. | 2 (16580) · Results and Discussion |
| sodium tetrathiomolybdate hydrate | Na2MoS4.3.5H2OMo in tetrathiomolybdate anions | unknown · PristineCrystalline hydrated sodium tetrathiomolybdate matched to JCPDS 00-038-0076. | 2 (16580) · Results and Discussion · Figure S1 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| (NH4)2MoS4 precursor crystalsresearch_0606__mat__mat_ammonium_tetrathiomolybdate | Powder · Unknown · Unknown | filtered, ethanol-washed, vacuum-dried red crystals | 2 · Experimental Section |
| <Na2MoS4> cold-pressed pelletresearch_0606__mat__mat_na2mos4_amorphous | Pellet · Target Sample · Pristine Framework | 10 mm pellet cold-pressed at 4.5 tons for 30 s under Arcarbon-coated aluminium foils during pressing | 4 · MIEC testing and analysis |
| dehydrated <Na2MoS4> powderresearch_0606__mat__mat_na2mos4_amorphous | Powder · Target Sample · Pristine Framework | vacuum-annealed dark amorphous phase | 6 · Figure S2 caption · Figure S2 |
| Na2MoS4.3.5H2O cold-pressed pelletresearch_0606__mat__mat_na2mos4_hydrate | Pellet · Pristine Control · Pristine Framework | 10 mm pellet cold-pressed at 4.5 tons for 30 s under Arcarbon-coated aluminium foils during pressing | 4 · MIEC testing and analysis |
| as-synthesised Na2MoS4.3.5H2O powderresearch_0606__mat__mat_na2mos4_hydrate | Powder · Pristine Control · Pristine Framework | red crystalline hydrated powder | 6 · Figure S2 caption · Figure S2 |
| <Na2MoS4> in situ XRD composite electrode cellresearch_0606__mat__mat_na2mos4_amorphous | Electrode · Composite Sample · Composite | composite electrode in XRD transmission cell with Li metal counter electrodein-house transmission-mode coin cell | 14 · Figure S10 caption · Figure S10 |
| <Na2MoS4> Li half-cell electrode with 0 wt % Super Presearch_0606__mat__mat_na2mos4_amorphous | Electrode · Target Sample · Pristine Framework | pressed powder electrode, Li metal counter electrodeCR2032 stainless-steel coin-cell case | 7 (16585) · Results and Discussion · Figure 6A,B |
| <Na2MoS4>/Super P Li half-cell electrodesresearch_0606__mat__mat_na2mos4_amorphous | Electrode · Composite Sample · Composite | hand-ground with 10, 20, or 30 wt % Super P and pressed as composite electrodeCR2032 stainless-steel coin-cell case | 3 · Electrochemical measurements |
| <Na2MoS4>/Super P Na half-cell electroderesearch_0606__mat__mat_na2mos4_amorphous | Electrode · Composite Sample · Composite | composite cathode with Na metal counter electrodeCR2032 stainless-steel coin-cell case | 3 · Electrochemical measurements |