Synergy of oxygen vacancies and thermoelectric effect enhances uranium(VI) photoreduction

Dual Charge-Transfer Channels Harmonize Carrier Separation for Efficient U(VI) Photoreduction

“…Notably, as a typical two-dimensional material, 1T-MoS 2 is commonly employed as an excellent photothermal agent to participate in the construction of co-catalysts in heterojunctions due to its good electrical conductivity and thermoelectric properties. − More importantly, 1T-MoS 2 has a higher Fermi energy level than RGO, which allows 1T-MoS 2 to act as a photogenerated electron buffer layer that can be used to separate photogenerated electrons from TiO 2– x using the Ohmic contact formed by coupling with TiO 2– x nanosheets. Furthermore, in the previous study, we found that 1T-MoS 2 as a co-catalyst can use the thermal potential to change the high-energy electron population on its own surface for more efficient U(VI) species capture …”

“…Furthermore, in the previous study, we found that 1T-MoS 2 as a co-catalyst can use the thermal potential to change the high-energy electron population on its own surface for more efficient U(VI) species capture. 37 Herein, we successfully synthesized a T 2−x TMR heterojunction with dual charge-transfer channels by exploiting the difference in Fermi levels between the heterojunction interfaces, which induced multilevel separation of photogenerated carriers. On the one hand, we found experimentally that the formation of local lattice defects enabled the Ohmic contact generated by the interfacial coupling between TiO 2−x and the co-catalyst 1T-MoS 2 to have a very small contact potential barrier (V B = −0.19 eV), which allowed more highenergy photogenerated electrons to be directionally transferred to the 1T-MoS 2 surface.…”

Biomimetic Photocatalytic System Designed by Spatially Separated Cocatalysts on Z‐scheme Heterojunction with Identified Charge‐transfer Processes for Boosting Removal of U(VI)

“…However, when EDTA-2Na was used as a hole-sacrificial agent, the U(VI) removal rate was reduced to 37% due to the type of U(VI) complexation with EDTA-2Na. [38] In the presence of an •O 2 − trapping agent (BQ), the photocatalytic performance was significantly reduced to 59.65%, showing that •O 2 − is involved in MTCA. When the emitted electron was immediately captured by an electron trapping agent (K 2 Cr 2 O 7 ), the removal rate of U(VI) dropped to 34.3%.…”

In Situ Metal‐Oxygen‐Hydrogen Modified B‐Tio2@Co2P‐X S‐Scheme Heterojunction Effectively Enhanced Charge Separation for Photo‐assisted Uranium Reduction

“…[43][44][45][46] To further verify the photo-induced charge separation and transfer direction at the B-TiO 2 @Co 2 P-X interface, the spatial distribution of charges was studied by the in situ Kelvin probe force microscope (KPFM). [47][48][49][50][51][52] The surface photovoltage of B-TiO 2 @Co 2 P-500 under dark and light conditions was compared by atomic force microscope (AFM) (Figure 6). Figure 6a1,b1 showed the overall distribution of surface potential under dark and light conditions, respectively.…”