Yu L., Xiao J., Huang C. et al. · Journal of Materials Chemistry A · 2022 · 17552-17560
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.
Fe-CoNi MOFs outperform pristine CoNi MOFs, Ni foam and RuO2 controls for alkaline OER by combining lower overpotential, lower Tafel slope, higher TOF and stable operation.
Caveat: Most electrochemical values use 85% iR compensation unless otherwise stated.
17555-17556 · Results and discussion · Fig. 3 · Linked to 5 structured results
The Fe incorporation method is presented as universal across CoM MOFs (M = Cu, Mn, Cd, Zn) and scalable to 10 cm x 10 cm electrodes.
Caveat: Universality overpotentials are extracted from figure labels; detailed literature-comparison table was not extractable from supplied SI text/images.
17554 and 17559 · Results and discussion · Fig. 3d; Fig. S34 · Linked to 4 structured results
During OER, CoNi MOFs and Fe-CoNi MOFs reconstruct into amorphous metal oxyhydroxides, which are assigned as the real active species.
Caveat: Surface/bulk characterisations are consistent, but active-species assignment remains operational under OER conditions.
17557 · Results and discussion · Fig. 4a-c · Linked to 3 structured results
DFT attributes improved OER activity to Fe-induced electronic coupling that upshifts the Co d-band centre and lowers the rate-determining OER barrier.
Caveat: Computational result uses simplified oxyhydroxide slab models rather than the full experimental heterogeneous electrode.
17558 · Results and discussion · Fig. 4h-i · Linked to 4 structured results
CoNi MOFs transform to Fe-CoNi MOFs in 3 s at room temperature through an etching-redeposition mechanism driven by acidic Fe(NO3)3 solution and Fe3+-assisted redeposition.
Caveat: Mechanism is inferred from control HNO3 treatment and structural characterisation rather than directly time-resolved.
17553 · Results and discussion · Fig. S2 · Linked to 2 structured results
Fe incorporation lowers the interfacial charge-transfer resistance of CoNi MOFs and is interpreted as improved electronic conductivity for more efficient charge transfer.
Caveat: Evidence is EIS Rct under OER conditions; no four-probe or bulk conductivity measurement is reported.
17556 · Results and discussion · Fig. 3f · Linked to 3 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| CoM MOFs | CoM MOFs where M = Cu, Mn, Cd or ZnCo plus Cu, Mn, Cd or Zn · 2-methylimidazole | 3D · PristineBimetallic CoM MOF controls prepared by replacing the Ni nitrate in the CoNi MOF recipe. | S2-S3 · Synthesis of CoNi MOFs on Ni foam · Fig. S8-S11 |
| CoNi MOFs | CoNi zeolitic imidazolate framework, exact stoichiometry not reportedCo and Ni · 2-methylimidazole | 3D · PristineBimetallic CoNi MOF micro-sheet arrays on Ni foam; XRD/FTIR assigned as zeolitic imidazolate framework. | 17553 · Results and discussion · Fig. 1b; Fig. S3-S4 |
| CoNiOOH model | CoNi oxyhydroxideCo and Ni oxyhydroxide sites · none | unknown · Model SystemDFT model for reconstructed CoNi MOFs active phase. | S5 · DFT calculations · Fig. S31 |
| Fe-CoM MOFs | Fe-incorporating CoM hydroxides/MOFs where M = Cu, Mn, Cd or ZnFe, Co and Cu/Mn/Cd/Zn · Residual 2-methylimidazole framework/linkers from corresponding CoM MOFs | 3D · DerivedFe-incorporated transformed CoM MOF-derived hierarchical electrodes. | S3 · Conversion of CoNi MOFs into Fe-CoNi MOFs · Fig. S12-S15 |
| Fe-CoNi MOFs | Fe-incorporating CoNi hydroxides/MOFsFe, Co and Ni · Residual 2-methylimidazole framework/linkers partly retained after etching-redeposition | 3D · DerivedPartially transformed Fe-incorporating CoNi hydroxides/MOFs with hierarchical micro-nano sheet/nanoparticle architecture and grain-boundary defects. | 17552 · Abstract |
| Fe-CoNiOOH model | Fe-incorporated CoNi oxyhydroxideFe, Co and Ni oxyhydroxide sites · none | unknown · Model SystemDFT model for reconstructed Fe-CoNi MOFs active phase. | S5 · DFT calculations · Fig. S31 |
| Ni foam | NiNi metal · none | 3D · PristineCommercial porous metallic substrate/control. | S2 · Chemicals |
| RuO2/IrO2 benchmark electrodes on Ni foam | RuO2 or IrO2 on Ni foamRu or Ir oxide benchmark catalyst · none | unknown · CompositeCommercial oxide benchmark loaded on Ni foam with Nafion binder. | S3 · Preparation of RuO2 and IrO2 electrodes on Ni foam |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| CoCd MOFsresearch_0653__mat__mat_com_mofs | Electrode · Pristine Control · Pristine Framework | Prepared by replacing Ni nitrate with Cd(NO3)2.4H2O.Ni foam | S3 · Synthesis of CoNi MOFs on Ni foam · Fig. S10 |
| CoCu MOFsresearch_0653__mat__mat_com_mofs | Electrode · Pristine Control · Pristine Framework | Prepared by replacing Ni nitrate with Cu(NO3)2.3H2O.Ni foam | S3 · Synthesis of CoNi MOFs on Ni foam · Fig. S8 |
| CoMn MOFsresearch_0653__mat__mat_com_mofs | Electrode · Pristine Control · Pristine Framework | Prepared by replacing Ni nitrate with Mn(NO3)2.4H2O.Ni foam | S3 · Synthesis of CoNi MOFs on Ni foam · Fig. S9 |
| CoNi MOFs on Ni foamresearch_0653__mat__mat_coni_mofs | Electrode · Pristine Control · Pristine Framework | As-synthesised micro-sheet MOF arrays on Ni foam.Ni foam · Ni foam thickness 1.6 mm | S2 · Synthesis of CoNi MOFs on Ni foam · Fig. S1 |
| CoNiOOH DFT surface modelresearch_0653__mat__mat_coniooh_model | Model · Model System · Model | Optimised DFT surface model without Fe. | S37 · Supplementary figures · Fig. S31 |
| CoZn MOFsresearch_0653__mat__mat_com_mofs | Electrode · Pristine Control · Pristine Framework | Prepared by replacing Ni nitrate with Zn(NO3)2.6H2O.Ni foam | S3 · Synthesis of CoNi MOFs on Ni foam · Fig. S11 |
| Fe-CoCd MOFsresearch_0653__mat__mat_fe_com_mofs | Electrode · Target Sample · Mixed Metal | Corresponding CoCd MOFs immersed into Fe(NO3)3 solution.Ni foam | S3 · Conversion of CoNi MOFs into Fe-CoNi MOFs · Fig. S14 |
| Fe-CoCu MOFsresearch_0653__mat__mat_fe_com_mofs | Electrode · Target Sample · Mixed Metal | Corresponding CoCu MOFs immersed into Fe(NO3)3 solution.Ni foam | S3 · Conversion of CoNi MOFs into Fe-CoNi MOFs · Fig. S12 |
| Fe-CoMn MOFsresearch_0653__mat__mat_fe_com_mofs | Electrode · Target Sample · Mixed Metal | Corresponding CoMn MOFs immersed into Fe(NO3)3 solution.Ni foam | S3 · Conversion of CoNi MOFs into Fe-CoNi MOFs · Fig. S13 |
| Fe-CoNi MOFs on Ni foam, 0.05 M Fe(NO3)3research_0653__mat__mat_fe_coni_mofs | Electrode · Target Sample · Mixed Metal | Fe concentration variant of the ultrafast transformation.Ni foam | S3 · Conversion of CoNi MOFs into Fe-CoNi MOFs · Fig. S18 |
| Fe-CoNi MOFs on Ni foam, 0.10 M Fe(NO3)3research_0653__mat__mat_fe_coni_mofs | Electrode · Target Sample · Mixed Metal | CoNi MOFs immersed in 10 mL 0.1 M Fe(NO3)3.9H2O for 3 s and air dried.Ni foam · CoNi MOFs piece 0.3 cm x 2 cm | S3 · Conversion of CoNi MOFs into Fe-CoNi MOFs |
| Fe-CoNi MOFs on Ni foam, 0.15 M Fe(NO3)3research_0653__mat__mat_fe_coni_mofs | Electrode · Target Sample · Mixed Metal | Fe concentration variant of the ultrafast transformation.Ni foam | S3 · Conversion of CoNi MOFs into Fe-CoNi MOFs · Fig. S18 |
| Fe-CoNi MOFs on Ni foam, 0.20 M Fe(NO3)3research_0653__mat__mat_fe_coni_mofs | Electrode · Target Sample · Mixed Metal | Fe concentration variant of the ultrafast transformation.Ni foam | S3 · Conversion of CoNi MOFs into Fe-CoNi MOFs · Fig. S18 |
| Fe-CoNi MOFs AEM electrolyser anoderesearch_0653__mat__mat_fe_coni_mofs | Electrode · Target Sample · Mixed Metal | Used as OER anode in AEM water splitting and CO2 reduction flow electrolysers.Ni foam · 1.2 cm x 1.2 cm in water electrolyser figure caption | 17558 · Fig. 5 caption · Fig. 5 |
| Large-area Fe-CoNi MOFs electroderesearch_0653__mat__mat_fe_coni_mofs | Electrode · Target Sample · Mixed Metal | Large-size electrode made by the same ultrafast room-temperature method.Ni foam · 10 cm x 10 cm | S40 · Supplementary figures · Fig. S34 |
| Fe-CoNiOOH DFT surface modelresearch_0653__mat__mat_fe_coniooh_model | Model · Model System · Model | Optimised DFT surface model with Fe incorporation. | S37 · Supplementary figures · Fig. S31 |
| Fe-CoZn MOFsresearch_0653__mat__mat_fe_com_mofs | Electrode · Target Sample · Mixed Metal | Corresponding CoZn MOFs immersed into Fe(NO3)3 solution.Ni foam | S3 · Conversion of CoNi MOFs into Fe-CoNi MOFs · Fig. S15 |
| IrO2 on Ni foam AEM benchmarkresearch_0653__mat__mat_ruo2_iro2 | Electrode · Pristine Control · Composite | Commercial IrO2 supported on Ni foam and used as AEM OER benchmark.Ni foam | S5 · AEM electrolyser test · Fig. 5 |
| Ni foam substrate controlresearch_0653__mat__mat_ni_foam | Electrode · Pristine Control · Unknown | Bare commercial Ni foam.Ni foam · 1.6 mm | 17555 · Results and discussion · Fig. 3a,b,f |
| RuO2 on Ni foamresearch_0653__mat__mat_ruo2_iro2 | Electrode · Pristine Control · Composite | Commercial RuO2/Nafion dispersion soaked on Ni foam and air dried.Ni foam | S3 · Preparation of RuO2 and IrO2 electrodes on Ni foam |