Anions mediated amino-type Cd-MOFs catalysts for efficient photocatalytic hydrogen evolution

Photocatalytic water splitting can be used to directly transfer solar energy into chemical energy with highly efficiency. Metal-organic frameworks (MOFs) materials are well known on the advantages of high design flexibility and metal center functionalization. In this study, a series of Cd-centered MOFs were successfully fabricated by a simple solvent evaporation method based on the different anion mediated pyridyl leucine derivatives. Single-crystal X-Ray diffraction showed the isostructural 3D chiral coordination networks of three Cd-MOFs with helical chains connected by the adjacent carboxylate groups. Within the helical coordination chains, the formate (For) and acetate (OAc) anions adopted chelate modes in Cd-L For and Cd-L OAc, whereas the chloride worked as a monodetate ligand in Cd-L Cl. Powder X-ray diffraction (PXRD), Thermogravimetric analysis, UV–vis spectra, Photocurrent-time test (I-t) and Mott-Schottky (MS) curves were carried out to characterize and analysis these Cd-MOFs. All the samples exhibit photocatalytic activity for hydrogen generation in aqueous solution of Na 2 S/Na 2 SO 3 upon irradiation at full light. The photocurrent time test showed that Cd-L Cl showed a higher photocurrent intensity than those of Cd-L For and Cd-L OAc, which proved the lower electron-hole recombination and correspondingly higher hydrogen production photocatalysis active. The highest H 2 production rate reached 17242 ​μmol ​g −1  ​h −1 for Cd-L Cl. In the photocatalytic reaction, the hydrogen production rate was stable without significant decrease, indicating that the material had no significant deactivation and had good photocatalytic activity.