Precise regulation of defect concentration in MOF and its influence on photocatalytic overall water splitting

Abstract

In this work, the defective Cu-BDC with different defect concentration and Cu1+/Cu2+ coordinatively unsaturated sites (CUS) content were designed and synthesized by introducing defective linkers with different pKa values. The...

The Emergence of 2D Building Units in Metal‐Organic Frameworks for Photocatalytic Hydrogen Evolution: A Case Study with COK‐47

“…Generally, emission is indicative of charge recombination, which in the case of COK‐47 originates from either insufficient mobility of the photoexcited electrons or the presence of missing ligand defects acting as recombination centers. [ 42–44 ] The almost complete quenching of emission in nanocrystalline defect‐free COK‐47 ISO – compared to COK‐47 S and COK‐47 L – suggests a more efficient charge separation, which potentially provides longer‐lived charge carriers and avoids quick radiative recombination processes, as we have demonstrated in our previous work. [ 13 ] Time‐resolved emission spectroscopy (TRES) measurements (Figure 3c) support this hypothesis showing that COK‐47 ISO has the longest lifetime with τ = 2.17 ns, compared to COK‐47 L and COK‐47 S , with τ = 1.43 and 0.30 ns, respectively, which correlates well with the increasing defect content and larger particle dimensions found in the samples.…”

Defect-containing metal–organic framework materials for sensor applications

“…This potential instability may limit the material's long-term viability and durability. 86 Importantly, defects can be tailored and engineered to elicit specic responses to target analytes. [87][88][89] Through deliberate defect design, researchers can customize MOFs for diverse applications, spanning environmental monitoring to medical diagnostics.…”

Snowflake-like Cu-BDC-NH2/Cu58S32 Binary Nanohybrid for H2 Evolution and O2 Reduction

“…The observed XRD pattern of CM is well aligned with the reported literature. 34 After the construction of the nanohybrid, the CSM(np)-2.5 material retains all the characteristic peaks of the CS(np) phase amidst peak broadening. In addition, a weak peak noted at 16.8°is due to the (333) planes of the Cu-MOF (Figure 1a).…”

“…in the organic linkers could show a bathochromic shift along with modification of the HOMO energy level . In terms of photocatalytic activation of atmospheric molecules, MOFs like UiO-66 (Zr), Ni-MOF, MIL-125 (Ti), MIL-53 (Al, Cr, Fe), MIL-88B (Fe) and ZIF have been explored intensively. ,, However, copper coordinated amino-functionalized benzenedicarboxylate MOF (Cu-BDC-NH 2 ) with paddle-wheel-like architecture containing solvent-exchangeable open metal sites is rarely explored for activation of atmospheric molecules. , Recently, Cu-BDC-NH 2‑ based heterostructure materials have been utilized for various applications like peroxidase mimicking activities, fluorescent sensing, adsorbent, supercapacitor application, CO 2 reduction, dye degradation, and overall water splitting. − In addition, the synthesis and photocatalytic application of metal sulfide-based heterojunctions containing Cu-BDC-NH 2 as a photoactive component is yet to be studied. To construct high-efficacy heterostructure materials, various nonconventional strategies like core–shell configuration, template-assisted synthesis, and hierarchical and epitaxial growth have been employed recently. , Among all of these, the template-assisted self-assembled growth of heterostructure materials displays an oriented and controlled topology that provides high interfacial contact for synergistic charge channelization.…”