Zhang H., Xu J., Jin Y. et al. · Chemistry - A European Journal · 2018 · 14522-14530
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.
2D-MCo3O4-NCNAs show the best ORR performance among the obtained MOF-derived materials, with near-four-electron selectivity and higher stability than Pt/C.
Caveat: No direct electrical conductivity measurement is reported; ORR transport benefit is inferred from electrochemical performance.
14527 · Results and Discussion · Figure 6 · Linked to 6 structured results
The target 2D-MCo3O4-NCNAs consist of monocrystalline Co3O4 nanosheets embedded in nitrogen-doped porous carbon.
14525 · Results and Discussion · Figure 4 · Linked to 4 structured results
The larger surface area and pore volume of 2D-MCo3O4-NCNAs are proposed to expose more active sites and improve transport of ORR/OER species.
Caveat: The link is correlative; the paper does not isolate surface area from composition and morphology.
14526 · Results and Discussion · Figure 5 · Linked to 3 structured results
Increasing ammonia accelerates Zn/Co coordination with 2-methylimidazole, produces more nuclei, decreases ZnCo-ZIF particle size, and enables a quantum-size-effect transformation of ZnCo-ZIF-15 into 2D nanosheet arrays.
Caveat: Quantum-effect interpretation is mechanistic inference by the authors, not a direct electronic quantum-confinement measurement.
14524-14525 · Results and Discussion · Figures 2-3 · Linked to 2 structured results
The target catalyst has lower OER charge-transfer resistance than IrO2, which the authors use as evidence for promoted charge transfer during OER.
Caveat: EIS was measured under application conditions and is not a standalone bulk electrical conductivity measurement.
14527 · Results and Discussion · Figure 7c · Linked to 2 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| 2D-MCo3O4-NCNAs | Co3O4-embedded nitrogen-doped carbon nanosheet arraysMonocrystalline Co3O4 nanosheets embedded in carbon · N-doped graphitic carbon derived from 2-methylimidazole | 2D · DerivedWell-aligned two-dimensional monocrystalline Co3O4-embedded nitrogen-doped porous carbon nanosheet arrays derived from ZnCo-ZIF-15. | 14522 · Abstract |
| Co3O4-NC-n-m products | Co3O4 nanoparticles in N-doped carbonCo3O4 derived from ZnCo-ZIF cobalt centres · Carbon and nitrogen matrix derived from 2-methylimidazole | 0D · DerivedCalcined ZnCo-ZIF products. Co3O4-NC-5-900 forms isolated small particles; Co3O4-NC-10-900 remains particle-rich with nanosheets on particle surfaces. | 14524-14525 · Results and Discussion · Figure 3d-f |
| Co-ZIF-n precursor series | Co-ZIF, cobalt 2-methylimidazolate frameworkCo2+ · 2-methylimidazole | 3D · PristineCobalt ZIF precursor series prepared with ammonia amounts n = 5, 10, and 15; XRD patterns are shown in Figure S1 and morphology in Figure S2. | 14528 · Experimental Section |
| CoPre-Co3O4-NC-n-900 products | Co3O4/N-doped carbon from Co-ZIFCo3O4 derived from Co-ZIF cobalt centres · Carbon and nitrogen matrix derived from 2-methylimidazole | unknown · DerivedCalcined Co-ZIF-n products that inherit precursor polyhedral shape and do not show the quantum-effect nanosheet transformation. | 1 · Supporting Information · Figure S2 |
| commercial IrO2 reference catalyst | IrO2IrO2 | unknown · PristineCommercial OER benchmark catalyst tested under the same OER conditions. | 14527 · Results and Discussion · Figure 7 |
| commercial Pt/C reference catalyst | Pt/CPt nanoparticles · carbon support | unknown · CompositeCommercial ORR benchmark catalyst tested under the same ORR conditions. | 14527 · Results and Discussion · Figure 6a,c |
| Bimetallic ZnCo-ZIF-n precursor series | ZnCo-ZIF, mixed Zn/Co 2-methylimidazolate frameworkZn2+ and Co2+ · 2-methylimidazole | 3D · PristineBimetallic ZIF polyhedra whose XRD peaks match simulated ZIF-67/ZIF-8; increasing ammonia decreases the precursor size. | 14523 · Results and Discussion · Figure 2a |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| 2D-MCo3O4-NCNAs-15-900research_0237__mat__mat_2d_mco3o4_ncna | Nanosheet · Target Sample · Derived Carbon | ZnCo-ZIF-15-derived product calcined at 900 C and drop-cast from catalyst ink for ORR/OER measurements.glassy carbon electrode for electrochemical tests | 14528 · Experimental Section |
| Co3O4-NC-10-900research_0237__mat__mat_co3o4_nc | Powder · Pristine Control · Derived Carbon | ZnCo-ZIF-10-derived product calcined at 900 C. | 14525 · Results and Discussion · Figure 3e-f |
| Co3O4-NC-5-900research_0237__mat__mat_co3o4_nc | Powder · Pristine Control · Derived Carbon | ZnCo-ZIF-5-derived product calcined at 900 C. | 14525 · Results and Discussion · Figure 3d; Figure S4 |
| Co3O4-NC-n-m seriesresearch_0237__mat__mat_co3o4_nc | Powder · Pristine Control · Derived Carbon | ZnCo-ZIF-n products calcined at 700, 800, or 900 C. | 14528 · Experimental Section |
| Co-ZIF-n precursor seriesresearch_0237__mat__mat_co_zif | Powder · Pristine Control · Pristine Framework | Ammonia-modulated Co-ZIF powders with n = 5, 10, and 15 uL ammonia. | 1 · Supporting Information · Figures S1-S2 |
| CoPre-Co3O4-NC-n-900 seriesresearch_0237__mat__mat_copre_co3o4_nc | Powder · Pristine Control · Derived Carbon | Co-ZIF-n-derived products calcined at 900 C. | 14529 · Experimental Section |
| commercial IrO2 OER reference electroderesearch_0237__mat__mat_iro2_ref | Electrode · Pristine Control · Unknown | Commercial IrO2 catalyst tested for OER under the same conditions.glassy carbon electrode | 14527 · Results and Discussion · Figure 7 |
| commercial Pt/C ORR reference electroderesearch_0237__mat__mat_ptc_ref | Electrode · Pristine Control · Composite | Commercial Pt/C catalyst tested for ORR under the same conditions.glassy carbon RRDE | 14527 · Results and Discussion · Figure 6 |
| ZnCo-ZIF-10 precursorresearch_0237__mat__mat_znco_zif | Powder · Pristine Control · Mixed Metal | Bimetallic ZIF precursor prepared with 10 uL ammonia. | 14524 · Results and Discussion · Figure 3b |
| ZnCo-ZIF-15 precursorresearch_0237__mat__mat_znco_zif | Powder · Pristine Control · Mixed Metal | Nanosized bimetallic ZIF precursor prepared with 15 uL ammonia. | 14525 · Results and Discussion · Figure 3c |
| ZnCo-ZIF-5 precursorresearch_0237__mat__mat_znco_zif | Powder · Pristine Control · Mixed Metal | Bimetallic ZIF precursor prepared with 5 uL ammonia. | 14524 · Results and Discussion · Figure 3a |