MOF-Derived Hollow Tubular In₂O₃/M^IIIn₂S₄ (M^II: Ca, Mn, and Zn) Heterostructures: Synergetic Charge-Transfer Mechanism and Excellent Photocatalytic Performance to Boost Activation of Small Atmospheric Molecules

Abstract

1:1) photocatalyst displayed the highest H 2 , NH 3 , and H 2 O 2 generation (5331, 870, and 5716 μmol g −1 h −1 ) with conversion efficiency of 34%, 6.5%, and 0.291%, respectively. This study offers a comprehensive analysis on how the coupling of three different d 0 , d 5 , and d 10 ternary metal chalcogenides M II In 2 S 4 with HT-In 2 O 3 affects the photocatalytic H 2 , NH 3 , and H 2 O 2 production.

Review of S-Scheme Heterojunction Photocatalyst for H₂O₂ Production

“…In addition, Mishra et al 83 successfully prepared graded HTIn2O3/MIn2S4 (M: Ca, Mn and Zn) tubular composite samples for effective visible-light-assisted photocatalytic ORR by controlled growth of ternary metal sulfide (MIn2S4) twodimensional structure on the surface of HT-In2O3. Interestingly, a blue shift in binding energy of In 3d peaks is observed by XPS with an increased number of 3d electron for the metals (Ca 2+ , Mn 2+ and Zn 2+ ) in the ternary metal sulfides.…”

“…Fig. 12 (A) Photocatalytic hydrogen production rate, (B) nitrogen fixation rate, (C) photocatalytic H2O2 production and (D) possible photocatalytic reaction route revealing carrier transmission of the prepared samples.Reproduced with permission83 . Copyright 2021, American Chemical Society.…”

Hierarchical UiO-66(−NH2)/CuInS2 S-Scheme Photocatalyst with Controlled Topology for Enhanced Photocatalytic N2 Fixation and H2O2 Production

“…2,20 In addition, the greater is the difference in work function or Fermi level between the reduction and oxidation photocatalyst, the higher will be the strength of the interelectric field (IEF), which enhances the space charge separation and mobilization. 8,19 Recently, various S-scheme heterojunctions including UiO-66-NH 2 /Bi 7 O 9 I 3 , CdIn 2 S 4 @ UiO-66-NH 2 , CdS/UiO-66, and CeO 2 /Ni-MOF have been prepared and explored toward renewable energy production and decontamination of persistent organic pollutants. 28−31 As the development of�crystal defects can control the work function of the photocatalyst, the research on IEF regulation of the S-scheme heterostructure by vacancy engineering has recently come to light.…”

“…Among different heterostructure materials designed in the recent past, the S-scheme heterojunctions provide improved charge channelization and higher redox ability for photocatalytic study . Mainly, the S-scheme heterojunction is formed by the coupling of a reduction photocatalyst (RP) with lower work function and high Fermi level with an oxidation photocatalyst (OP) that possesses higher work function and lower Fermi energy level. , In addition, the greater is the difference in work function or Fermi level between the reduction and oxidation photocatalyst, the higher will be the strength of the interelectric field (IEF), which enhances the space charge separation and mobilization. , Recently, various S-scheme heterojunctions including UiO-66-NH 2 /Bi 7 O 9 I 3 , CdIn 2 S 4 @UiO-66-NH 2 , CdS/UiO-66, and CeO 2 /Ni-MOF have been prepared and explored toward renewable energy production and decontamination of persistent organic pollutants. − As the development ofcrystal defects can control the work function of the photocatalyst, the research on IEF regulation of the S-scheme heterostructure by vacancy engineering has recently come to light. Thus, it is very crucial to engineer an effectual heterojunction system with strong microscopic contact between the two semiconductors.…”

Cu-Doped ZnIn2S4/NixP Composites with Enhanced Carrier Dynamics and Photocatalytic Hydrogen Production Performance

“…Hydrogen energy derived from sunlight-driven photocatalytic water splitting has been extensively regarded as an effective and green strategy to solve energy crises and environmental issues. − The solar-to-hydrogen conversion markedly relies on the photocatalytic materials, which are capable of harvesting solar energy, fulfilling the Gibbs free energy of hydrogen evolution, and finally splitting water into hydrogen. However, low photocatalytic conversion efficiency for current catalytic materials limits the practical applications due to the strictly required band structure, inefficient light absorption, and low electron/hole separation capability. , Recently, ZnIn 2 S 4 (marked ZIS) shows great potential in the field of photocatalysis owing to its suitable band gap (2.2–2.4 eV), good light absorption, facile preparation, excellent chemical stability, and low cost. − Particularly, the valence band due to the 3p orbital of the sulfur atom is easily moved upward in comparison to most oxides, resulting in a stronger reduction ability. Nevertheless, for pure ZIS, the high carrier recombination rate, low quantum efficiency, insufficient active sites, and unsatisfactory charge utilization impede its practical application.…”