Primary studyCore evidenceTransport Physics

Microenvironment modulation in heterometallic MOFs for tailoring electron/proton transport and hydrophilicity toward photocatalytic hydrogen production

Lin Z., Lin J., Yu S.-W. et al. · Inorganic Chemistry Communications · 2026 · 116638

2materials
8samples
2synthesis routes
41measurements
107results
10claims and caveats

Evidence map

Open a family to keep every result attached to its sample, method and conditions.

Author interpretations and caveats

Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.

Application RelevanceSupport assessment: Medium

Ni-AEs retain H2 production under seawater and sunlight conditions, but the SI condition labels are internally inconsistent.

Caveat: Main text/Fig. 2d and SI Tables S7/S8 disagree on seawater versus sunlight labelling. | Schema-normalised claim_type from 'application_performance' to 'application_relevance'; the original controlled-label wording is retained here.

3 · Results · Linked to 4 structured results

Application RelevanceSupport assessment: High

Ni-Ca gives higher photocatalytic H2 evolution than Ni-Sr under the standard, seawater and sunlight assignments, consistent with its improved electron/proton transport and hydrophilicity.

Caveat: Main text/Fig. 2d and SI Tables S7/S8 disagree on the seawater versus sunlight labels; the extraction follows the main-text/figure assignment. | Schema-normalised claim_type from 'application_performance' to 'application_relevance'; the original controlled-label wording is retained here.

5 · Results · Linked to 8 structured results

Application RelevanceSupport assessment: High

Both Ni-Ca and Ni-Sr are pristine heterometallic MOFs with directly measured electronic and proton transport properties.

Caveat: Schema-normalised claim_type from 'scope_relevance' to 'application_relevance'; the original controlled-label wording is retained here.

1 · Abstract · Linked to 4 structured results

Application RelevanceSupport assessment: Medium

Ni-AEs are structurally stable during photocatalytic recycling, with activity remaining near 90% after four cycles.

Caveat: Recycling and pH-stability support includes figure/caption evidence; no raw diffraction data are supplied.

5 · 3. Result and discussion · Fig. 2f; Figs. S9-S11 referenced · Linked to 3 structured results

Phase AssignmentSupport assessment: High

Ni-Ca crystallises as a triclinic P-1 interlaced 3D framework assembled from NiS and CaO clusters.

Caveat: Schema-normalised claim_type from 'structure' to 'phase_assignment'; the original controlled-label wording is retained here.

2 · Results · Linked to 3 structured results

Phase AssignmentSupport assessment: Medium

Ni-Sr is treated as an isostructural Sr analogue based on PXRD similarity and metal-ratio evidence.

Caveat: No separate full SCXRD table for Ni-Sr was present in the local documents. | Schema-normalised claim_type from 'structure' to 'phase_assignment'; the original controlled-label wording is retained here.

3 · Results · Linked to 2 structured results

Structure Property LinkSupport assessment: Medium

Redox-active NiS clusters mimic hydrogenase active centres, while CaO/SrO clusters and hydrogen-bonding chains create a hydrophilic microenvironment that supports electron/proton transport and hydrogen evolution.

Caveat: The microenvironment mechanism is supported by structure, hydrogen bonding and transport/application correlations rather than a direct operando mechanistic measurement.

3 · 3. Result and discussion · Fig. 1; Fig. 2 · Linked to 8 structured results

Transport MechanismSupport assessment: High

Mott-Schottky plots identify Ni-AEs as n-type semiconductors with similar conduction-band potentials.

5 · Results · Linked to 4 structured results

Transport MechanismSupport assessment: Medium

PL quenching and EPR evidence support faster photo-induced electron transfer for Ni-Ca than Ni-Sr.

Caveat: PL constants are read from plotted Stern-Volmer equations; EPR comparison is partly qualitative. | Schema-normalised claim_type from 'photophysics_mechanism' to 'transport_mechanism'; the original controlled-label wording is retained here.

5 · Results · Linked to 4 structured results

Transport MechanismSupport assessment: High

Replacing Sr2+ with Ca2+ improves carrier mobility, electronic conductivity, proton conductivity, and hydrophilicity.

5 · Results · Linked to 8 structured results

Material identities

Names and aliases are kept exactly within the paper’s own identity model.

MaterialCompositionStructure contextSource
Ni-Ca heterometallic MOF (Ni-Ca)Not specified['redox-active NiS clusters', 'redox-inactive CaO clusters']unknown · Unknown1 · Abstract
Ni-Sr heterometallic MOF (Ni-Sr)Not specified['redox-active NiS clusters', 'redox-inactive SrO clusters']unknown · Unknown2 · Synthesis

Sample register

Sample form, processing state and composition status define the context for measurements.

Show 8 sample records
SampleForm and roleProcessing and geometrySource
Ni-Ca dark brown crystals / powderresearch_0697__mat__ni_ca_mofPowder · Target Sample · Mixed Metaltarget_sample2 · Synthesis
Ni-Ca DFT modelresearch_0697__mat__ni_ca_mofModel · Model System · Modelmodel_system8 · S8 Density Functional Theory
Ni-Ca coated electrochemical electroderesearch_0697__mat__ni_ca_mofElectrode · Composite Sample · Compositecomposite_sampleS5 Electrochemical Tests
Ni-Ca pressed pelletresearch_0697__mat__ni_ca_mofPellet · Target Sample · Mixed Metaltarget_sample7 · S7 Proton and Electrical Conductivity Tests
Ni-Sr brown crystals / powderresearch_0697__mat__ni_sr_mofPowder · Target Sample · Mixed Metaltarget_sample2 · Synthesis
Ni-Sr DFT modelresearch_0697__mat__ni_sr_mofModel · Model System · Modelmodel_system4
Ni-Sr coated electrochemical electroderesearch_0697__mat__ni_sr_mofElectrode · Composite Sample · Compositecomposite_sampleS5 Electrochemical Tests
Ni-Sr pressed pelletresearch_0697__mat__ni_sr_mofPellet · Target Sample · Mixed Metaltarget_sample7 · S7 Proton and Electrical Conductivity Tests