Metal-organic frameworks (MOFs) have emerged as highly tunable functional materials with applications in catalysis, gas storage, sensing, and energy conversion. However, their practical use is often hindered by the challenges associated with handling powdered forms, including poor mechanical stability, difficult recovery, and limited interfacial charge transfer. To overcome these limitations, researchers have developed various coating strategies to immobilize MOFs onto substrates. Traditional methods typically rely on secondary binders or complex surface activation steps, which can block pores, reduce active sites, and impede electron transport. This study presents a simple, binder-free, mechanochemical approach for fabricating uniform nanocrystalline MOF coatings directly on diverse non-prefunctionalized substrates—carbon cloth, polyvinylidene fluoride (PVDF), nickel foam, titanium foil, fluorine-doped tin oxide (FTO) glass, and zirconia ceramics—without requiring pre-treatment or additional adhesives.
The method leverages high-energy ball milling to induce solid-state reactions between pre-synthesized MOF precursors and substrates.CD72 Antibody Technical Information A key discovery was the formation of an interfacial atomic diffusion layer at the MOF-substrate boundary, confirmed through transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDS). This interfacial layer, composed of alloyed elements such as Co–Zr or Zn–C, enables strong chemical bonding and enhances coating stability. Notably, even inert substrates like ZrO₂ balls exhibited surface deposition of MOF-derived species after milling, indicating that mechanical force alone can drive interdiffusion and interfacial reactivity. The same principle applies to flexible carbon-based substrates: ball milling pristine carbon cloth with ZIF-8 powder results in a smooth, adherent coating with average particle sizes of ~100 nm, as confirmed by scanning electron microscopy (SEM). XRD and CO₂ adsorption analyses confirm that the crystalline, porous structure of ZIF-8 is preserved post-coating, while ICP-OES data show minimal material loss after 100 bending cycles.
This technique also enables one-pot synthesis: stoichiometric precursors—zinc oxide and 2-methylimidazole—are directly milled with substrates to generate ZIF-8 coatings in a single step. Successful coating was demonstrated on carbon cloth, PVDF membranes, nickel foam, titanium foils, and FTO glass, with XRD patterns confirming crystallinity and SEM images revealing uniform coverage. In particular, dense titanium foils showed near-complete conversion of precursors, verified by UV-Vis spectroscopy and gas adsorption measurements. The coating process is scalable, as demonstrated by successful application on a 5.5 × 11 cm carbon cloth using a large-scale ball mill.GSK3 alpha Antibody References Furthermore, dual-side coatings were fabricated on porous Matrimid supports, enabling hierarchical architectures for advanced device integration.PMID:34986349
Electrochemical evaluation confirmed the functionality of the coatings. Co-ZIF-4 and amorphous ZIF-67 (amZIF-67) were coated on carbon cloth via ball milling and tested for oxygen evolution reaction (OER). After amorphization, overpotentials dropped significantly—from 464 mV (Co-ZIF-4-CC) to 383 mV (agCo-ZIF-4-CC)—demonstrating enhanced catalytic activity. Chronopotentiometry under 10 mA cm⁻² for 150 hours revealed excellent long-term stability of agCo-ZIF-4-CC, highlighting its potential for industrial electrocatalysis. Additionally, the coating on FTO glass maintained electrical conductivity and interfacial contact, as evidenced by XPS shifts in Sn and Zn peaks, indicating robust interfacial bonding.
In summary, this mechanochemical platform offers a versatile, scalable, and binder-free route to fabricate stable, conductive MOF coatings across a wide range of substrates. It combines simplicity, efficiency, and adaptability, paving the way for low-cost, high-performance devices in energy storage, environmental remediation, and smart sensing technologies.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com