Primary studyCore evidenceTransport Physics

Boosting electrocatalytic CO2 reduction reaction over viologen-functionalized metal-organic frameworks by enhancement of electron-transfer capacity

Dong Y.-L., Jing Z.-Y., Wu Q.-J. et al. · Journal of Materials Chemistry A · 2023 · 8739-8746

4materials
8samples
7synthesis routes
75measurements
93results
6claims 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: High

Optimal Vg-Por(Co)-MOF(9:1) reaches high CO2-to-CO performance in MEA, with FECO near 94%, jCO 111.1 mA cm-2 and TOF about 4.6 x 10^3 h-1.

Caveat: MEA voltage is reported as full-cell voltage rather than RHE potential.

p006 / article 8744 · Results and discussion · Fig. 5 · Linked to 3 structured results

Composite RoleSupport assessment: High

Viologen incorporated in the MOF backbone transfers electrons more effectively than methyl-viologen located in channels or on surfaces.

Caveat: The main text calls MV@Por a physical mixture, while SI gives a solvothermal recipe; exact guest location is inferred from authors' comparison.

p005 / article 8743 · Results and discussion · Fig. S32-S34 · Linked to 2 structured results

Phase AssignmentSupport assessment: High

The Por(Co)-MOF, Vg-MOF and Vg-Por(Co)-MOF series share the same UiO-type topology and retain Co-N4 porphyrin coordination without Co or CoO particles.

Caveat: Exact empirical framework formulae are not reported in the extracted text.

p003-p004 / article 8741-8742 · Results and discussion · Fig. 3 · Linked to 3 structured results

Structure Property LinkSupport assessment: High

Backbone-integrated viologen ETM improves electron-transfer capacity and raises Vg-Por(Co)-MOF(9:1) conductivity about eightfold over Por(Co)-MOF.

Caveat: Conductivity is low and was measured by two-contact pressed-pellet method, so contact resistance may contribute.

p004 / article 8742 · Results and discussion · Fig. S24 · Linked to 2 structured results

Transport MechanismSupport assessment: Medium

Higher Cdl and smaller EIS semicircle for Vg-Por(Co)-MOF(9:1) indicate faster interfacial charge transfer and larger electrochemically active surface area.

Caveat: EIS comparison is qualitative from Nyquist plots; Cdl is an indirect ECSA proxy.

p004-p005 / article 8742-8743 · Results and discussion · Fig. S25-S30 · Linked to 2 structured results

Transport MechanismSupport assessment: Medium

Reversible Vg redox states accelerate proton-coupled electron transfer, promoting formation of *COOH at Co-N4 sites and subsequent CO generation.

Caveat: Mechanistic assignment is inferred from in situ UV/ATR-IR bands rather than direct kinetic isotope or operando structural proof.

p006 / article 8744 · Results and discussion · Fig. S40-S43 · Linked to 3 structured results

Material identities

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

MaterialCompositionStructure contextSource
MV@Por(Co)-MOF(9:1)Methyl-viologen-loaded Por(Co)-MOF control; exact formula not reportedHf6-based Por(Co)-MOF framework · Por(Co) linker plus methyl viologen additive/guest3D · CompositeNon-backbone-integrated viologen control used to compare with covalently integrated Vg-Por(Co)-MOF(9:1).p005 / article 8743 · Results and discussion · Fig. S32-S34
Por(Co)-MOFHf6(mu3-O)4(mu3-OH)4 Por(Co)-linked UiO-type MOF; exact formula not reported12-connected Hf6(mu3-O)4(mu3-OH)4 secondary building units · 5,15-di(p-benzoato)-10,20-diphenyl-porphyrin cobalt(II), Por(Co)3D · PristineUiO-type open framework with 1.6 nm triangular channels and 2.8/2.0 nm octahedral/tetrahedral voids.p002 / article 8740 · Results and discussion · Fig. S8
Vg-MOFZr-based UiO-type viologen MOF; exact formula not reportedZr oxo cluster from ZrOCl2.8H2O route; Vg-MOF EDS maps Zr · [H2bpybdc]Cl2 viologen dicarboxylate linker (Vg)3D · PristineSame PXRD topology as the Por(Co)-MOF/Vg-Por(Co)-MOF family; Vg-MOF route uses Zr source in SI.p002 / article 8740 · Results and discussion · Fig. S7, Fig. S23
Vg-Por(Co)-MOF(n:1)Multivariate Hf6(mu3-O)4(mu3-OH)4 MOF with Por(Co) and Vg linkers; exact formula not reported12-connected Hf6(mu3-O)4(mu3-OH)4 secondary building units · Mixed Por(Co) and Vg dicarboxylate linkers with Por(Co):Vg ratios n:13D · PristineMultivariate UiO-type MOF in which Vg electron-transfer mediator modules are inserted into cobalt-porphyrin MOF backbones.p002 / article 8740 · Results and discussion · Fig. 1

Sample register

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

Show 8 sample records
SampleForm and roleProcessing and geometrySource
MOF sample seriesresearch_0250__mat__mat_vg_por_co_mofPowder · Paper Level Unspecified · Unknownas-synthesisedp002 / article 8740 · Results and discussion · Fig. S7
MV@Por(Co)-MOF(9:1)research_0250__mat__mat_mv_por_co_mofPowder · Composite Sample · Guest Loadedsolvothermal guest/additive control; washed, solvent-exchanged in DMF, acetone washed and driedp013 · Section S3 · Synthesis of MV@Por(Co)-MOF(9:1)
Por(Co)-MOFresearch_0250__mat__mat_por_co_mofPowder · Pristine Control · Pristine Frameworkwashed, solvent-exchanged in DMF, acetone washed and driedp012 · Section S3 · Synthesis of Por(Co)-MOF
Vg-MOFresearch_0250__mat__mat_vg_mofPowder · Pristine Control · Pristine Frameworkwashed, solvent-exchanged in DMF, acetone washed and driedp011 · Section S3 · Synthesis of Vg-MOF
Vg-Por(Co)-MOF(1:1)research_0250__mat__mat_vg_por_co_mofPowder · Target Sample · Pristine Frameworkwashed, solvent-exchanged in DMF, acetone washed and driedp013 · Section S3 · Synthesis of Vg-Por(Co)-MOF(1:1)
Vg-Por(Co)-MOF(2:1)research_0250__mat__mat_vg_por_co_mofPowder · Target Sample · Pristine Frameworkwashed, solvent-exchanged in DMF, acetone washed and driedp013 · Section S3 · Synthesis of Vg-Por(Co)-MOF(2:1)
Vg-Por(Co)-MOF(5:1)research_0250__mat__mat_vg_por_co_mofPowder · Target Sample · Pristine Frameworkwashed, solvent-exchanged in DMF, acetone washed and driedp012 · Section S3 · Synthesis of Vg-Por(Co)-MOF(5:1)
Vg-Por(Co)-MOF(9:1)research_0250__mat__mat_vg_por_co_mofPowder · Target Sample · Pristine Frameworkwashed, solvent-exchanged in DMF, acetone washed and dried; also pressed as pellet and made into electrodesAFM height profile about 2.5 nm in Fig. 2c; family nanosheets 1-4 nm after ultrasonic treatmentp001 / article 8739 · Abstract