Fine-Tuning the Metal Oxo Cluster Composition and Phase Structure of Ni/Ti Bimetallic MOFs for Efficient CO₂ Reduction

Abstract

The photocatalytic activity of metal−organic frameworks (MOFs) is closely related to the components and structures of metal oxo clusters. In this article, a gradient modulation of metal oxo cluster components is achieved via tuning the molar ratio of Ni 2+ /Ti 4+ in the Ni/Ti bimetallic MOFs. Ni/Ti bimetallic MOFs exhibit adjustable physicochemical properties and enhanced photocatalytic activity compared with Ti-MOF and Ni-MOF. The introduction of Ni with high electron affinity in titanium oxo clusters is responsible for the enhanced charge separation and transfer in Ni/Ti bimetallic MOFs. The extended tunability of components and structures of Ni/Ti bimetallic MOFs provides more opportunities for MOF-based materials design.

Green Photocatalysis of Organic Pollutants by Bimetallic Zn-Zr Metal-Organic Framework Catalyst

“…For Zn-Zr MOF-2, however, only a broad peak at 2θ = 7.3° was seen, and for Zn-Zr MOF-3 only the peak at 2θ = 8.5° was seen, with that at 2θ = 7.3° having disappeared. Evidently, the crystal structure of Zr MOF was gradually modified by the introduction of Zn ( Chen et al, 2021 ). Compared with Zr MOF, the peaks of the Zn-Zr MOF composites were obviously weakened or disappeared, but there were no obvious new peaks that could be attributed to discrete Zn or Zr compounds.…”

Rational Design of Metal–Organic Framework‐Based Materials for Photocatalytic CO2 Reduction

“…Metal doping to construct bimetallic assemblies in MOF semiconductors is demonstrated to be an effective strategy for enhancing the performance of semiconductor‐based photocatalysts, due to their influence on the bandgap, the introduction of MMCT between different metal nodes, and the facilitated transfer of excitons from different LMCT processes along the matched states between the different metal nodes. [ 60 ] In addition, introducing functional metal nodes like reductive metal nodes to construct MOFs can also result in great performance in photocatalytic CO 2 RR.…”

Ag/Ni–MOF heterostructure with synergistic enrichment and activation properties for electrocatalytic reduction of 4-nitrophenol

“…S9b, ESI †), XPS well fitted two signal peaks at 531.2 and 529.4 eV, resulting from the CQO structure in the carbonyl group and the Ni-O of the NiO 6 octahedral structure, respectively. 19 The obvious characteristic peaks at 873.0 and 855.0 eV could be easily defined (Fig. S9c, ESI †), corresponding to the expected Ni 2p 1/2 and Ni 2p 3/2 , respectively.…”