Shi X., Hua R., Xu Y. et al. · Sustainable Energy and Fuels · 2020 · 4589-4597
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.
FeCo0.6Ni0.4-CAT is considered a precatalyst because it electrochemically transforms to metal hydroxides/oxyhydroxides under alkaline OER conditions.
Caveat: Post-OER structural details supported by supplied SI Figures S10-S11.
6 · Results and discussion · Fig. 4 · Linked to 6 structured results
CoxNi1-x-CATs and FeCoxNi1-x-CATs have similar diffraction patterns characteristic of isostructural Co-CAT, indicating framework crystallinity is retained after Fe cation exchange.
Caveat: SI supplied; PXRD peak set is reported in main text, while SI figures mainly support related characterisation.
3 · Results and discussion · Fig. 1a · Linked to 1 structured result
Fe incorporation substantially lowers OER overpotentials of M-CATs, with FeCo0.6Ni0.4-CAT giving the best reported activity.
Caveat: OER active phase is assigned as electrochemically formed hydroxide/oxyhydroxide, so pristine MOF values are precatalyst performance rather than intrinsic MOF catalytic activity.
4 · Results and discussion · Fig. 3 · Linked to 5 structured results
The low Rct of activated FeCo0.6Ni0.4-CAT is used as evidence that Fe incorporation enhances charge transfer during OER.
Caveat: This is electrochemical charge-transfer resistance, not a bulk electrical conductivity measurement.
6 · Results and discussion · Fig. 5a; Table S3 · Linked to 6 structured results
The authors argue that Co offsets Fe-induced suppression of Ni(OH)2 to NiOOH oxidation, and that NiOOH conductivity enhanced by Fe favours OER electrocatalysis.
Caveat: The exact active centre in NiCoFe oxyhydroxides is stated to be unidentified; the conductivity link is mechanistic interpretation rather than direct conductivity data.
7 · Results and discussion · Fig. 5b · Linked to 5 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Co0.4Ni0.6-CATBrowse family: Ni/Co–HHTP family | Co0.4Ni0.6-CAT, nominal CoxNi1-x-CAT with x = 0.4Mixed Co/Ni nodes · HHTP | 2D · PristineBimetallic M-CAT; similar PXRD pattern to isostructural Co-CAT. | 2 · Synthesis of CoxNi1-x-CATs |
| Co0.6Ni0.4-CATBrowse family: Ni/Co–HHTP family | Co0.6Ni0.4-CAT, nominal CoxNi1-x-CAT with x = 0.6Mixed Co/Ni nodes · HHTP | 2D · PristineBimetallic conductive M-CAT; similar PXRD pattern to Co-CAT; hexagonal nanorods. | 2 · Synthesis of CoxNi1-x-CATs |
| Co0.8Ni0.2-CATBrowse family: Ni/Co–HHTP family | Co0.8Ni0.2-CAT, nominal CoxNi1-x-CAT with x = 0.8Mixed Co/Ni nodes · HHTP | 2D · PristineBimetallic M-CAT; similar PXRD pattern to isostructural Co-CAT. | 3 · Results and discussion |
| Co-CATBrowse family: Co₃(HHTP)₂ / Co–HHTP | Co3(HHTP)2 / M-CAT family, described as stacked Co3(HHTP)2(H2O)6 and Co3(HHTP)(H2O)12 layersCo2+ nodes · HHTP, 2,3,6,7,10,11-hexahydroxytriphenylene | 2D · PristineConductive M-CAT; alternating stacked 2D layers with hydrogen bonding and pi-pi interactions along [001]. | 1 · Introduction |
| FeCo0.4Ni0.6-CATBrowse family: Ni/Co/Fe–HHTP family | FeCo0.4Ni0.6-CATFe/Co/Ni mixed nodes after cation exchange · HHTP | 2D · PristineTrimetallic FeCoxNi1-x-CAT; similar PXRD pattern to Co-CAT. | 3 · Results and discussion |
| FeCo0.6Ni0.4-CATBrowse family: Ni/Co/Fe–HHTP family | FeCo0.6Ni0.4-CAT; ICP Co/Ni = 0.59/0.41 for the 1 mM Fe(OAc)2 sampleFe/Co/Ni mixed nodes after cation exchange · HHTP | 2D · PristineTrimetallic conductive M-CAT; hexagonal nanorods; Co, Ni and Fe homogeneously distributed; electrochemically transforms to metal hydroxides/oxyhydroxides under OER conditions. | 1 · Abstract |
| FeCo0.8Ni0.2-CATBrowse family: Ni/Co/Fe–HHTP family | FeCo0.8Ni0.2-CATFe/Co/Ni mixed nodes after cation exchange · HHTP | 2D · PristineTrimetallic FeCoxNi1-x-CAT; similar PXRD pattern to Co-CAT. | 3 · Results and discussion |
| FeCo-CATBrowse family: Ni/Co/Fe–HHTP family | FeCoxNi1-x-CAT with parent Co-CAT; no NiFe/Co mixed nodes after cation exchange · HHTP | 2D · PristineFe-exchanged bimetallic M-CAT; similar PXRD pattern to Co-CAT. | 2 · Synthesis of FeCoxNi1-x-CATs |
| FeNi-CATBrowse family: Ni/Co/Fe–HHTP family | FeCoxNi1-x-CAT with parent Ni-CAT; no CoFe/Ni mixed nodes after cation exchange · HHTP | 2D · PristineFe-exchanged bimetallic M-CAT; similar PXRD pattern to Co-CAT. | 4 · Results and discussion · Fig. 2 |
| Ni-CATBrowse family: Ni₃(HHTP)₂ / Ni–HHTP | Ni3(HHTP)2 / M-CAT familyNi2+ nodes · HHTP | 2D · PristineConductive M-CAT isostructural with Co-CAT. | 2 · Synthesis of CoxNi1-x-CATs |
| Commercial RuO2 | RuO2 | unknown · UnknownCommercial non-MOF OER benchmark. | 5 · Results and discussion · Fig. 3 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Co0.4Ni0.6-CAT powder/electroderesearch_0093__mat__mat_co04ni06_cat | Electrode · Pristine Control · Mixed Metal | as-synthesised MOF powder drop-cast as catalyst ink and electrochemically activated before OERglassy carbon electrode for OER measurements | 2 · Synthesis of CoxNi1-x-CATs |
| Co0.6Ni0.4-CAT powder/electroderesearch_0093__mat__mat_co06ni04_cat | Electrode · Pristine Control · Mixed Metal | as-synthesised MOF powder drop-cast as catalyst ink and electrochemically activated before OERglassy carbon electrode for OER measurements | 2 · Synthesis of CoxNi1-x-CATs |
| Co0.8Ni0.2-CAT powder/electroderesearch_0093__mat__mat_co08ni02_cat | Electrode · Pristine Control · Mixed Metal | as-synthesised MOF powder drop-cast as catalyst ink and electrochemically activated before OERglassy carbon electrode for OER measurements | 2 · Synthesis of CoxNi1-x-CATs |
| Co-CAT powder/electroderesearch_0093__mat__mat_co_cat | Electrode · Pristine Control · Pristine Framework | as-synthesised MOF powder drop-cast as catalyst ink and electrochemically activated before OERglassy carbon electrode for OER measurements | 2 · Synthesis of CoxNi1-x-CATs |
| FeCo0.4Ni0.6-CAT powder/electroderesearch_0093__mat__mat_feco04ni06_cat | Electrode · Target Sample · Mixed Metal | Co0.4Ni0.6-CAT after nominal 1 mM Fe(OAc)2 methanolic cation exchange, drop-cast and electrochemically activated before OERglassy carbon electrode for OER measurements | 3 · Results and discussion |
| FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) = 0.06research_0093__mat__mat_feco06ni04_cat | Electrode · Target Sample · Mixed Metal | Co0.6Ni0.4-CAT after 0.25 mM Fe(OAc)2 methanolic cation exchangeglassy carbon electrode for OER measurements | 4 · Results and discussion |
| FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) = 0.15research_0093__mat__mat_feco06ni04_cat | Electrode · Target Sample · Mixed Metal | Co0.6Ni0.4-CAT after 0.5 mM Fe(OAc)2 methanolic cation exchangeglassy carbon electrode for OER measurements | 4 · Results and discussion |
| FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) about 0.32research_0093__mat__mat_feco06ni04_cat | Electrode · Target Sample · Mixed Metal | Co0.6Ni0.4-CAT after 1.0 mM Fe(OAc)2 methanolic cation exchange, drop-cast and electrochemically activated before OERglassy carbon electrode for OER measurements | 3 · Results and discussion |
| FeCo0.6Ni0.4-CAT powder/electrode, Fe/(Co+Ni) = 0.49research_0093__mat__mat_feco06ni04_cat | Electrode · Target Sample · Mixed Metal | Co0.6Ni0.4-CAT after 2.0 mM Fe(OAc)2 methanolic cation exchangeglassy carbon electrode for OER measurements | 4 · Results and discussion |
| FeCo0.8Ni0.2-CAT powder/electroderesearch_0093__mat__mat_feco08ni02_cat | Electrode · Target Sample · Mixed Metal | Co0.8Ni0.2-CAT after nominal 1 mM Fe(OAc)2 methanolic cation exchange, drop-cast and electrochemically activated before OERglassy carbon electrode for OER measurements | 3 · Results and discussion |
| FeCo-CAT powder/electroderesearch_0093__mat__mat_feco_cat | Electrode · Target Sample · Mixed Metal | Co-CAT after Fe(OAc)2 methanolic cation exchange, drop-cast and electrochemically activated before OERglassy carbon electrode for OER measurements | 2 · Synthesis of FeCoxNi1-x-CATs |
| FeNi-CAT powder/electroderesearch_0093__mat__mat_feni_cat | Electrode · Target Sample · Mixed Metal | Ni-CAT after Fe(OAc)2 methanolic cation exchange, drop-cast and electrochemically activated before OERglassy carbon electrode for OER measurements | 4 · Results and discussion · Fig. 2 |
| Ni-CAT powder/electroderesearch_0093__mat__mat_ni_cat | Electrode · Pristine Control · Pristine Framework | as-synthesised MOF powder drop-cast as catalyst ink and electrochemically activated before OERglassy carbon electrode for OER measurements | 2 · Synthesis of CoxNi1-x-CATs |
| Commercial RuO2 benchmark electroderesearch_0093__mat__mat_ruo2_benchmark | Electrode · Pristine Control · Unknown | commercial benchmark catalyst ink, OER measurementglassy carbon electrode for OER measurements | 5 · Results and discussion · Fig. 3 |