Fabrication of Bi₂O₃/Bismuth Titanates Modified with Metal–Organic Framework-In₂S₃/CdIn₂S₄ Materials for Electrocatalytic H₂ Production and Its Photoactivity

Abstract

Compositional and structural elucidation of the materials is important to know their properties, chemical stability, and electro-photoactivity. The heterojunction electrocatalyst and photocatalyst activity could open a new window for solving the most urgent environmental and energy problems. Here, for the first time, we have designed and fabricated Bi 2 O 3 /bismuth titanates modified with MOF-In 2 S 3 /CdIn 2 S 4 materials by a stepwise process. The detailed structural elucidation and formation of mixed composite phases were studied in detail. It has been found that the formed composite was efficiently utilized for the electrocatalytic H 2 production reaction and the photocatalytic degradation of tetracycline. XRD patterns for the metal−organic framework-In 2 S 3 showed a main compound of MOF, and it was assigned to a MIL-53 MOF phase, with a monoclinic structure. The addition of CdCl 2 onto the MOF-In 2 S 3 phase effectively produced a CdIn 2 S 4 flower platform on the MOF rods. The uniform dispersion of the bismuth titanates in MOF-In 2 S 3 /CdIn 2 S 4 materials is detected by mapping of elements obtained by dark-field HAADF-STEM. Finally, the predictions of how to integrate experiments and obtain structural results more effectively and their common development in new heterojunctions for electro-/photocatalytic applications are presented.

Size-dependent d0 room temperature ferromagnetism in undoped In2S3 nanoparticles

“…Among these, β-In 2 S 3 is known to be the most stable structural form at room temperature, and it is a defect spinel structure that displays intriguing physical properties due to cation vacancies creating intermediate band or trapping levels within the bandgap. 15,16 Li et al studied the electronic structure of the Eu-doped In 2 S 3 system by density functional theory calculations, finding that the introduction of Eu doping and In vacancies induces impurity energy levels, leading to ferromagnetic behavior. 17 Datta et al observed octet paramagnetic bands in Co-doped In 2 S 3 micropompons through EPR spectra analysis.…”