Cu-pyrazolate cluster-based halogen-rich magnetic MOFs for electrochemical water splitting

Area of Science:

• Materials Science
• Electrochemistry
• Magnetism

Background:

• Metal-organic frameworks (MOFs) offer tunable structures for catalysis.
• Copper-based MOFs are of interest for electrochemical applications.
• The node-spacer concept allows for systematic MOF design.

Purpose of the Study:

• To synthesize and evaluate copper-cluster-based MOFs for electrochemical water splitting.
• To investigate the impact of halogen-substituted linkers on catalytic activity.
• To explore the magnetic properties of the synthesized Cu-MOFs.

Main Methods:

• Synthesis of Cu-MOFs using a trinuclear Cu-pyrazolate (TCuP) node and halogen-substituted dicarboxylic acids as spacers.
• Electrochemical water splitting studies in alkaline media to assess catalytic performance (overpotential, electrocatalytic surface area, Tafel slopes).
• Magnetic studies, including cryogenic measurements, to evaluate magnetic refrigeration potential.

Main Results:

• The synthesized Cu-MOFs exhibit robust network structures with the TCuP motif.
• Electrochemical studies show competitive water oxidation catalytic activity compared to existing systems.
• Magnetic studies reveal interesting magnetic features and potential for magnetic refrigeration (-ΔSM values up to 7 J kg⁻¹ K⁻¹).

Conclusions:

• The node-spacer strategy is effective for creating functional Cu-MOFs for water splitting.
• Halogenated linkers positively influence the electronic environment of catalytic sites, enhancing electrocatalysis.
• The Cu-MOFs demonstrate dual functionality, serving as efficient electrocatalysts and promising magnetic materials.