Perumal S., Lim T., Seenivasan S. et al. · Applied Surface Science · 2022 · 154553
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.
2.8-IrOx@Ni/Co-ZIF-67 outperforms commercial IrO2 for alkaline OER under the reported testing conditions, with lower overpotential and lower Tafel slope.
Caveat: Measured as catalyst ink on glassy carbon in 1 M KOH without iR compensation; long-term durability is 24 h only.
article p5 · Results and discussion · Figure 4a-c · Linked to 4 structured results
The Ni/Co-ZIF-67 nanosheet support enables uniform dispersion of ultrafine IrOx nanoparticles without noticeable aggregation.
Caveat: Average particle size is reported from 25 TEM-selected particles.
article p4 · Results and discussion · Figure 2b-d · Linked to 2 structured results
Ni incorporation preserves the native ZIF-67 structure without detectable secondary phases, with Ni coordinated by imidazolate linkers.
Caveat: Based on XRD/FTIR and SI EDS captions; exact SI table contents were unavailable.
article p3 · Results and discussion · Figure 1; Figure S1 · Linked to 2 structured results
Ni incorporation and IrOx immobilisation reduce OER charge-transfer resistance, providing the paper's main quantitative proxy for improved conductivity/electronic communication.
Caveat: This is electrochemical impedance in the catalyst/electrolyte configuration, not a standalone solid-state conductivity measurement.
article p5 · Results and discussion · Figure 4d · Linked to 3 structured results
Ni/Co-ZIF-67-2 is the optimum mixed-metal support because it combines the largest reported BET surface area in the series with the lowest support-only OER overpotential and Tafel slope.
Caveat: Actual Ni/Co atomic ratio is XPS-derived as 1:6.5, while synthesis feed ratio is 0.1:0.9.
article p3 · Results and discussion · Figure 1 · Linked to 4 structured results
The best OER performance is attributed to an evenly controlled ratio of metallic Ir0 and Ir3+ in 2.8-IrOx@Ni/Co-ZIF-67: Ir3+ promotes hydroxide/dehydration chemistry and metallic Ir stabilizes Ir3+ and improves charge transfer.
Caveat: Mechanistic assignment is inferred by authors from XPS speciation, OER metrics, and literature-supported Ir state roles; no operando spectroscopy is reported.
article p5 · Results and discussion · Figure 3; Figure 4 · Linked to 5 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Commercial IrO2 benchmark | IrO2Ir oxide benchmark particles | unknown · UnknownCommercial IrO2 particles used as electrocatalytic OER benchmark. | article p5 · Results and discussion · Figure 4 |
| IrOx@Ni/Co-ZIF-67Browse family: ZIF-67 / Co(mIm)₂ | IrOx nanoparticles supported on Ni/Co-ZIF-67 nanosheetsNi/Co ZIF nodes plus supported Ir0/Ir3+/Ir4+ oxide/metal species · 2-methylimidazolate / imidazolate linkers in the Ni/Co-ZIF-67 support | 2D · CompositeComposite of ultrafine IrOx nanoparticles on Ni/Co-ZIF-67; XRD retains Ni/Co-ZIF-67 peaks, while TEM/XPS indicate metallic Ir, crystalline IrO2, and amorphous IrOx species. | article p4 · Results and discussion · Figure 2 |
| Ni/Co-ZIF-67 nanosheetsBrowse family: ZIF-67 / Co(mIm)₂ | Ni/Co mixed-metal ZIF-67; exact empirical formula not reportedCo and Ni ions coordinated by imidazolate linkers; optimized Ni/Co atomic ratio reported as 1:6.5 · 2-methylimidazolate / imidazolate linkers | 2D · PristineNi-incorporated ZIF-67 nanosheets retaining native ZIF-67 XRD features with no secondary phases; Ni ions are coordinated by imidazole linkers as Co is in ZIF-67. | article p3 · Results and discussion · Figure 1 |
| ZIF-67 nanosheetsBrowse family: ZIF-67 / Co(mIm)₂ | Co(2-methylimidazolate) framework; exact empirical formula not reportedCo ions coordinated by imidazolate linkers · 2-methylimidazolate / dimethylimidazolate as described in FTIR discussion | 2D · PristineNanosheet-shaped zeolitic imidazolate framework-67; XRD peaks at 12.5 and 25 deg match standard ZIF-67 (211) and (422) planes. | article p2 · Experimental procedure, 2.1 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Commercial IrO2 benchmark electroderesearch_0520__mat__mat_commercial_iro2 | Electrode · Pristine Control · Unknown | Commercial IrO2 particles coated on glassy carbon under the same electrochemical testing protocol.glassy carbon electrode with Nafion/isopropanol catalyst ink · active mass 0.2 mg cm^-2 for catalyst-coated working electrodes | article p5 · Results and discussion · Figure 4 |
| 1.6-IrOx@Ni/Co-ZIF-67research_0520__mat__mat_irox_nico_zif67 | Nanosheet · Composite Sample · Composite | Ni/Co-ZIF-67 loaded with IrOx from 10 mg IrCl3.3H2O precursor; actual Ir content 1.6 at.% by XPS/Table S1 as reported in main text. | article p2 · Experimental procedure, 2.3 |
| 2.8-IrOx@Ni/Co-ZIF-67 / IrOx@Ni/Co-ZIF-67research_0520__mat__mat_irox_nico_zif67 | Nanosheet · Target Sample · Composite | Ni/Co-ZIF-67 loaded with IrOx from 20 mg IrCl3.3H2O precursor; actual Ir content 2.8 at.% and selected as optimized catalyst. | article p5 · Results and discussion · Figure 4 |
| 6.5-IrOx@Ni/Co-ZIF-67research_0520__mat__mat_irox_nico_zif67 | Nanosheet · Composite Sample · Composite | Ni/Co-ZIF-67 loaded with IrOx from 100 mg IrCl3.3H2O precursor; actual Ir content 6.5 at.% by XPS/Table S1 as reported in main text. | article p5 · Results and discussion · Figure S11 |
| Ni/Co-ZIF-67-1research_0520__mat__mat_nico_zif67 | Nanosheet · Pristine Control · Mixed Metal | Prepared by replacing part of Co(NO3)2.6H2O with Ni(NO3)2.6H2O; nominal Ni/Co feed ratio 0.05:0.95. | article p2 · Experimental procedure, 2.2 |
| Ni/Co-ZIF-67-2 / Ni/Co-ZIF-67research_0520__mat__mat_nico_zif67 | Nanosheet · Pristine Control · Mixed Metal | Prepared by the ZIF-67 procedure with Co(NO3)2.6H2O/Ni(NO3)2.6H2O feed ratio 0.9:0.1; selected as optimized support for IrOx immobilisation. | article p3 · Results and discussion · Figure 1 |
| Ni/Co-ZIF-67-3research_0520__mat__mat_nico_zif67 | Nanosheet · Pristine Control · Mixed Metal | Prepared by the ZIF-67 procedure with nominal Ni/Co feed ratio 0.3:0.7. | article p2 · Experimental procedure, 2.2 |
| Ni/Co-ZIF-67-4research_0520__mat__mat_nico_zif67 | Nanosheet · Pristine Control · Mixed Metal | Prepared by the ZIF-67 procedure with nominal Ni/Co feed ratio 0.5:0.5. | article p2 · Experimental procedure, 2.2 |
| ZIF-67 nanosheet powder/controlresearch_0520__mat__mat_zif67 | Nanosheet · Pristine Control · Pristine Framework | Hydrothermally synthesised purple ZIF-67 nanosheets, washed with water/ethanol, dried overnight at 80 deg C. | article p2 · Experimental procedure, 2.1 |