MOFs-based S-scheme heterojunction photocatalysts

S-Scheme Heterojunction Photocatalysts for CO2 Reduction

“…As organic porous materials, the covalent organic framework (COF) and metal organic framework (MOF) are excellent photocatalytic materials with abundant catalytic sites, which can effectively prevent particle aggregation, and their structures are easy to be modified; furthermore, higher catalytic activity and selectivity can be achieved by modulating their structural compositions [111,112]. Niu et al [113] embedded octahedral NH 2 −UiO-66 (Zr) (NUZ) on the surface of an olefin (C=C)-linked covalent organic framework (TTCOF) to conduct visible-light-driven CO 2 photoreduction (Figure 9c).…”

Low-Cytotoxic Core–Sheath ZnO NWs@TiO2–xNy Triggered Piezo-photocatalytic Antibacterial Activity

“…This method enhances charge transfer and facilitates the generation of ROS. − When two semiconductors with different energy band structures are in contact and a heterojunction forms, the spontaneous flow of electrons between the semiconductors creates a free-electron-depletion region, which results in a built-in electric field that effectively segregates holes and electrons. In previous studies, many research groups have prepared different types of heterojunctions and demonstrated that they can effectively improve the activity of photocatalysts, such as conventional type II heterojunctions, p – n heterojunctions, , Z-type heterojunctions, − and S-type heterojunctions. − …”

Prussian blue analogue-derived materials for photocatalysis

“…1c–f), such as Z-scheme heterojunctions, S-scheme heterojunctions, p–n heterojunctions, and Schottky heterojunctions, respectively. 30–42 At present, Z-scheme and S-scheme heterojunctions have been studied in-depth and widely used for photocatalytic reactions. These heterojunctions are often constructed by distinct materials with different band gaps.…”

“…In 2013, a direct Z-scheme heterojunction complex was reported to overcome the shortcomings of the original Z-type heterojunction. 28,30–36 (ii) S-scheme heterojunctions are formed by reduced photocatalysts (RP) and oxidized photocatalysts (OP), which are similar to type II heterojunctions. However, the difference between type II and S-scheme heterojunctions is that a built-in electric field (BIEF) is formed in S-scheme heterojunctions, and the reduction and oxidation reactions occur on the RP and OP, respectively.…”

“…At present, the S-scheme heterojunction photocatalysts are usually composed of two different n-type semiconductors with an obvious Fermi-level difference. 36–38 (iii) The p–n heterojunctions are constructed by n-type and p-type semiconductors, where the photo-excited e − and h + will transfer from the n-type semiconductor to the p-type semiconductor to form a BIEF at the semiconductor interface. The p–n heterojunctions often appear in type I and type II heterojunctions.…”