Wu J.-Q., Zhao J.-W., Li G.-R. · Energy and Fuels · 2020 · 9050-9057
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.
MoO2 NPs@N-C NSs/NF shows superior alkaline HER activity relative to NF and MoO2/NF controls.
Caveat: Comparison is electrochemical and catalyst-loading dependent.
4 · Results and Discussion · Figure 3a-b · Linked to 4 structured results
The target catalyst maintains HER performance during 24 h operation and after 1000 cycles.
Caveat: Longer-term industrial stability was not assessed.
5 · Results and Discussion · Figure 3d-e · Linked to 2 structured results
N-doped carbon confines MoO2 nanoparticles, improves conductivity, suppresses agglomeration, and increases accessible HER active sites.
Caveat: Electrical conductivity is inferred from EIS charge-transfer resistance rather than direct conductivity.
3 and 5 · Results and Discussion; Conclusions · Figure 1; Figure 3c · Linked to 3 structured results
DFT indicates that the MoO2/N-C composite can bring hydrogen adsorption free energy closer to the ideal value than isolated carbon or MoO2 active-site models.
Caveat: Authors state that the effect of N-C structure on MoO2 H adsorption was not further studied because of model difficulty.
5 · Results and Discussion · Figure 4 · Linked to 5 structured results
The target MoO2/N-doped porous carbon nanosheet catalyst is obtained by solvothermal Mo-MOF growth on nickel foam followed by N2 pyrolysis.
Caveat: The structure of the Mo-MOF precursor is not newly solved in this paper.
3 · Results and Discussion · Scheme S1 · Linked to 2 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Mo-MOF | Not specifiedMo from MoO3 precursor · 2-methylimidazole (2-Mim) | 2D · PristineMOF-derived porous nanosheets grown on nickel foam; phase matched a previously reported Mo-MOF. | 2 · Experimental Section · Scheme 1; Figure S1 |
| carbon model | C | unknown · Model SystemGraphitic six-membered ring model for MOF-derived carbon. | 10 · C and NC active sites · Figure S12 |
| MoO2 (-111) slab model | MoO2Mo atoms in MoO2 slab | unknown · Model SystemDFT slab model of the MoO2 (-111) surface. | 8 · Crystal face selection · Figure S8; Table S2 |
| MoO2/N-C model | MoO2/N-CMoO2 slab | unknown · Model SystemMoO2 crystal plane matched with N-doped carbon skeleton. | 11 · MoO2/C and MoO2/N-C active sites · Figure S15 |
| N-doped carbon model | N-C | unknown · Model SystemNitrogen-doped graphitic carbon model. | 11 · C and NC active sites · Figure S14 |
| Pt(111) model | PtPt atoms in (111) slab | unknown · Model SystemDFT Pt(111) reference model. | 13 · Table S3 · Table S3 |
| MoO2 NPs@N-C NSs | MoO2/C/NMoO2 nanoparticles | 2D · DerivedMoO2 nanoparticles confined in N-doped porous carbon nanosheets derived from Mo-MOF. | 1 · Abstract |
| MoO2/NF | MoO2/NiMoO2 | unknown · CompositeMoO2 control on nickel foam. | 4 · Results and Discussion · Figure 3 |
| nickel foam | NiNi foam | 3D · PristineThree-dimensional conductive nickel foam substrate/control. | 5 · Conclusions |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| C modelresearch_0690__mat__model_c | Model · Model System · Model | DFT-relaxed graphite-ring model | 10 · C and NC active sites · Figure S12 |
| MoO2 (-111) modelresearch_0690__mat__model_moo2_111 | Model · Model System · Model | DFT-relaxed slab with top atomic layers relaxed and other layers fixed10 A vacuum slab | 7 · Calculation details |
| MoO2/N-C modelresearch_0690__mat__model_moo2_nc | Model · Model System · Model | DFT-relaxed MoO2/N-C composite model | 12 · MoO2/C and MoO2/N-C active sites · Figure S15 |
| N-C modelresearch_0690__mat__model_nc | Model · Model System · Model | DFT-relaxed N-doped carbon model | 11 · C and NC active sites · Figure S14 |
| Pt(111) reference modelresearch_0690__mat__model_pt111 | Model · Model System · Model | DFT reference catalyst model | 13 · Table S3 · Table S3 |
| Mo-MOF/NFresearch_0690__mat__mo_mof | Electrode · Composite Component · Composite | solvothermally grown on cleaned nickel foam, washed and driednickel foam · porous nanosheets with thickness of about 140 nm | 3 · Results and Discussion · Figure 1a |
| MoO2 NPs@N-C NSs/NFresearch_0690__mat__moo2_nc | Electrode · Target Sample · Composite | Mo-MOF/NF annealed at 600 C for 3 h under N2nickel foam · nanosheet thickness about 150 nm; MoO2 NP diameter about 30 nm | 3 · Results and Discussion · Figure 1b-d |
| MoO2 NPs@N-C NSs peeled from NFresearch_0690__mat__moo2_nc | Nanosheet · Target Sample · Composite | peeled from NF through ultrasonication for powder XRD | 3 · Results and Discussion · Figure S4b |
| MoO2/NFresearch_0690__mat__moo2_nf | Electrode · Pristine Control · Composite | control electrode; synthesis not separately specifiednickel foam | 4 · Results and Discussion · Figure 3a-c |
| NFresearch_0690__mat__nf | Electrode · Pristine Control · Pristine Framework | ultrasonically cleaned with acetone, HCl solution, ethanol, and deionized water2.5 cm x 4 cm piece used for synthesis | 2 · Experimental Section |