Facile preparation of Z-scheme CdS Ag TiO2 composite for the improved photocatalytic hydrogen generation activity

Synthesis of Amino-Functionalized Ti-MOF Derived Yolk–Shell and Hollow Heterostructures for Enhanced Photocatalytic Hydrogen Production under Visible Light

“…Therefore, an appropriate amount of CdS is essential to achieve optimum photocatalytic activity of the MOF-derived heterostructures. The current hydrogen production rate of the NH 2 -MIL-125/TiO 2 /CdS (30) yolk–shell and H-TiO 2 /CdS­(30) were greater than the previously reported NH 2 -MIL-125- and TiO 2 -based composites. ,,− …”

“…19 The MOFs derivatives also facilitate the separation of photoinduced charge carriers by making interfacial contact when the two components possess well-matched energy band structures. 20 They do not only maintain the initial structural topographies but also exhibit rich active sites, high surface area, and dispersed nanosubunits, which awarded them higher performances in environmental and energy-related applications such as batteries, supercapacitors, and catalysis. 21,22 For instance, Wang et al synthesized multilayer CuO@NiO hollow spheres by using a (Cu-Ni-BTC) bimetallic organic framework as template with enhanced electrochemical performances.…”

“…Recently, metal–organic frameworks (MOFs) composed of metal ions coordinated with organic ligands are an emerging class of porous materials due to their tunable porosities, chemical adjustability, and various functionalities. − Besides many advantages in various fields, MOFs practical applications still have some limitations in the field of catalysis, such as recycling instability problems and low activity of the central metal atom due to blockage caused by surrounding organic linkers. , In order to overcome these limitations, a lot of strategies have been reported in which MOFs can be pyrolyzed into various functional materials like metal compounds − or introduction of different components into MOFs to make hybrid composites (e.g., carbon hybrid, Bi 2 S 3 @NH 2 -MIL-125 heterostructure). ,− Currently, MOFs have been extensively used as sacrificial precursors for preparing functional materials with tailored compositions and complex structures such as metal sulfides, metal oxide, and porous carbon materials . The MOFs derivatives also facilitate the separation of photoinduced charge carriers by making interfacial contact when the two components possess well-matched energy band structures . They do not only maintain the initial structural topographies but also exhibit rich active sites, high surface area, and dispersed nanosubunits, which awarded them higher performances in environmental and energy-related applications such as batteries, supercapacitors, and catalysis. , For instance, Wang et al synthesized multilayer CuO@NiO hollow spheres by using a (Cu-Ni-BTC) bimetallic organic framework as template with enhanced electrochemical performances. , Yang’s group also synthesized ZnO/ZnCo 2 O 4 hollow core–shell nanocages from ZIF-8 with significantly enhanced gas-sensing properties .…”

Semiconductor-based photocatalysts for photocatalytic and photoelectrochemical water splitting: will we stop with photocorrosion?

“…A typical all-solid-state Z-scheme photocatalytic system, CdS-Ag-TiO 2 , was constructed by Zhao et al through a solvothermal process for hydrogen evolution under xenon lamp irradiation, in which Ag NPs and TiO 2 quantum dots were successively deposited on the surface of CdS nanowires. 176 The recycling test showed that CdS-Ag-TiO 2 exhibited the highest stability with no obvious decrease in hydrogen production aer four cycles, while nearly 43% loss in hydrogen production was detected for the CdS-TiO 2 composite. The poor stability of CdS-TiO 2 was attributed to the fact that the excited holes of CdS still remained in the VB of CdS, thereby resulting in hole-induced photocorrosion in the CdS-TiO 2 system.…”

Enhanced PEC Water Splitting Performance of Silver Nanoparticle-Coated CdS Nanowire Photoanodes: The Role of Silver Deposition

“…Cadmium sulfide, due to its suitable band gap position and light sensitizing ability, is considered as a promising photocatalyst material, its nanostructures have been investigated extensively in solar-driven PEC, photocatalysis and solar cell applications. − However, some critical shortcomings such as its limited visible-light absorption regime, low charge-transfer rate, and fast recombination limit its PEC energy conversion efficiency. ,, Among the noble metals, Ag is an inexpensive metal, and Ag NPs <30 nm under visible-light illumination exhibit strong surface plasmon resonance and produce highly energetic hot electrons through nonradiative decay, resulting in enhanced optical absorption, charge separation, and thus improved PEC performance . The production of highly energetic hot electrons and cost effectiveness make it a good alternative to expensive noble metals such as Au NPs and an ideal choice for large-scale applications.…”