Liu M., Li Y., Qi Z. et al. · Journal of Physical Chemistry Letters · 2021 · 8706-8712
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.
Br-Ni MOF is the best first-hand catalyst in this paper for two-electron ORR to H2O2, reaching about 90% selectivity, 86% FE, and 596 mmol gcat-1 h-1 H-cell productivity.
Caveat: Best-catalyst statement is within the studied Ni MOF family and the alkaline-electrolyte comparison table; no raw data were available.
main p.5, article p.8710 · Summary · Linked to 4 structured results
Br-Ni MOF retained high selectivity and current response during a 15 h ORR operation, indicating robust electrochemical H2O2 production stability.
Caveat: The paper reports unchanged ring/disk currents and selectivity; no replicated durability statistics are provided.
main p.4, article p.8709 · Results and discussion · Figure 3c and Figure S11 · Linked to 2 structured results
The paper describes the Ni-HITP-type materials as conductive MOFs but does not report a first-hand electrical conductivity, mobility, Seebeck coefficient, or thermoelectric measurement.
Caveat: Conductivity is inferred from framework class and literature context only; not extracted as a numeric transport result.
main p.1-p.2, article p.8706-p.8707 · Introduction and Results
Confined halogen anions couple with positively charged Ni nodes in the structural nanocavity, producing lattice contraction and pore shrinkage in X-Ni MOFs.
Caveat: XRD peak shift and BJH contraction are reported for the family; individual contracted pore diameters for each halide were not tabulated.
main p.2, article p.8707 · Results and discussion · Figure 1 · Linked to 6 structured results
Operando XAFS and SR-FTIR support a mechanism in which confined Br anions suppress dissociation of *OOH intermediates on Ni sites, favouring the two-electron ORR pathway.
Caveat: Mechanistic assignment is based on operando spectroscopy and impedance interpretation, not direct isolation of intermediates.
main p.5, article p.8710 · Summary · 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 |
|---|---|---|---|
| Br-Ni MOFBrowse family: Ni₃(HITP)₂ / Ni–HITP | Br-confined Ni-HITP-type MOFPlanar Ni nodes interacting with confined bromide anions. · HITP. | 2D · PristineHalogen-anion-confined conductive Ni MOF showing lattice contraction and contracted nanocavity relative to pristine Ni MOF. | main p.4, article p.8709 · Results and discussion · Figure 3d |
| Cl-Ni MOFBrowse family: Ni₃(HITP)₂ / Ni–HITP | Cl-confined Ni-HITP-type MOFPlanar Ni nodes interacting with confined chloride anions. · HITP. | 2D · PristineHalogen-anion-confined conductive Ni MOF showing lattice contraction relative to pristine Ni MOF. | main p.2, article p.8707 · Results and discussion · Figure 1 |
| F-Ni MOFBrowse family: Ni₃(HITP)₂ / Ni–HITP | F-confined Ni-HITP-type MOFPlanar Ni nodes interacting with confined fluoride anions. · HITP. | 2D · PristineHalogen-anion-confined conductive Ni MOF showing lattice contraction relative to pristine Ni MOF. | main p.2, article p.8707 · Results and discussion · Figure 1 |
| I-Ni MOFBrowse family: Ni₃(HITP)₂ / Ni–HITP | I-confined Ni-HITP-type MOFPlanar Ni nodes interacting with confined iodide anions. · HITP. | 2D · PristineHalogen-anion-confined conductive Ni MOF showing lattice contraction relative to pristine Ni MOF. | main p.2, article p.8707 · Results and discussion · Figure 1 |
| Pristine Ni MOFBrowse family: Ni₃(HITP)₂ / Ni–HITP | Ni-HITP-type MOF; exact empirical formula not directly reported in this paperPlanar Ni nodes; Ni2+ features observed by Ni 2p XPS. · 2,3,6,7,10,11-hexaiminotriphenylene (HITP). | 2D · PristineConductive Ni-based MOF with periodic nanocavity array within the a-b plane; (100) diffraction peak at 2theta = 4.5 degrees and d spacing approx 1.8 nm. | main p.2, article p.8707 · Results and discussion · Figure 1 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Br-Ni MOF catalystresearch_0880__mat__br_ni_mof | Powder · Target Sample · Guest Loaded | Black powder prepared by replacing NH4F with NH4Br, washed and vacuum-dried; used to fabricate catalyst inks/electrodes for RRDE, H-cell, flow-cell, XAFS, FTIR, and EIS tests. | SI p.S2 · Preparation of X-Ni (X = F, Cl, Br, I) and Ni MOF catalysts |
| Cl-Ni MOF catalystresearch_0880__mat__cl_ni_mof | Powder · Target Sample · Guest Loaded | Black powder prepared by replacing NH4F with NH4Cl, washed and vacuum-dried; used to fabricate catalyst inks/electrodes for ORR tests. | SI p.S2 · Preparation of X-Ni (X = F, Cl, Br, I) and Ni MOF catalysts |
| F-Ni MOF catalystresearch_0880__mat__f_ni_mof | Powder · Target Sample · Guest Loaded | Black powder prepared with NH4F, washed and vacuum-dried; used to fabricate catalyst inks/electrodes for ORR tests. | SI p.S2 · Preparation of X-Ni (X = F, Cl, Br, I) and Ni MOF catalysts |
| I-Ni MOF catalystresearch_0880__mat__i_ni_mof | Powder · Target Sample · Guest Loaded | Black powder prepared by replacing NH4F with NH4I, washed and vacuum-dried; used to fabricate catalyst inks/electrodes for ORR tests. | SI p.S2 · Preparation of X-Ni (X = F, Cl, Br, I) and Ni MOF catalysts |
| Ni MOF catalystresearch_0880__mat__ni_mof | Powder · Pristine Control · Pristine Framework | Black powder, washed with distilled water and ethanol and dried under vacuum at 60 deg C overnight; used to fabricate catalyst inks/electrodes for ORR tests. | SI p.S2 · Preparation of X-Ni (X = F, Cl, Br, I) and Ni MOF catalysts |