Constructing an S-scheme heterojunction of 2D/2D Cd0.5Zn0.5S/CuInS2 nanosheet with vacancies for photocatalytic hydrogen generation under visible light

Target-Induced Photocurrent-Polarity-Switching PEC Sensing Platform Based on In Situ Generation of Oxygen Vacancy-Modulated Energy Band Structures

“…Among the BiOX compounds, BiOBr has high chemical stability, unique laminar structure, suitable band gap, and tunable optical properties making it of great concern in PEC sensing research. , However, its inherent disadvantages such as narrow light absorption range, rapid compounding of photogenerated electron–hole pairs, and slow interfacial charge transfer limit its application in PEC sensors . Two-dimensional (2D) metal–organic frameworks (MOFs) are broadly applied in PEC analysis owing to their high porosity, high specific surface area, and exposed active sites that facilitate photoelectron transport. , The modification of BiOBr using 2D copper tetrakis­(4-carboxyphenyl)­porphyrin MOF (CuMOF) can effectively broaden the light absorption range, promote charge separation, and extend the lifetime of photogenerated carriers. , The intimate contact and large interface area between the 2D/2D heterojunction interfaces also can increase the light trapping area and shorten the carrier transfer path, contributing to increasing the photoactivity and improving the performance of PEC sensors. , More importantly, CuMOF has a similar and interleaved matching energy band structure to BiOBr, which provides the possibility to change the electron transport route to achieve polarization modulation. – …”

“…28,29 The intimate contact and large interface area between the 2D/2D heterojunction interfaces also can increase the light trapping area and shorten the carrier transfer path, contributing to increasing the photoactivity and improving the performance of PEC sensors. 30,31 More importantly, CuMOF has a similar and interleaved matching energy band structure to BiOBr, which provides the possibility to change the electron transport route to achieve polarization modulation. 32−35 In this paper, the polarity switching of the photocurrent in the BiOBr/CuMOF heterojunction was modulated by introducing oxygen vacancies (OVs) and enzyme-catalysisinduced electron donor generation to further develop a PEC sensing platform with optimized detection performance.…”

One-pot hydrothermal synthesis of noble-metal-free NiS on Zn0.5Cd0.5S nanosheet photocatalysts for high H2 evolution from water under visible light

“…5(b), which is consistent with the previous report. 73 After the introduction of the NiS cocatalyst, all of the ZCS/NS samples not only exhibit a remarkable enhanced light absorption, including the visible region ranging from 650 nm to 800 nm, but also have a slight red-shift, indicating that there is a decrease in the energy band gap ( E g ) of these samples. This result demonstrates that the one step hydrothermal deposited NiS has a considerable positive influence on the utilization of visible light, and hence the ZCS/NS composite sample is expected to have superior photocatalytic performance.…”

Bi3O4Cl/g-C3N4/Cd0.5Zn0.5S Double Z-Scheme Heterojunction Photocatalyst for Highly Selective CO2 Reduction to Methane

“…30 The Zn 2p spectrum of CZS can be divided into two peaks at 1044.7 and 1021.7 eV corresponding to Zn 2p 3/2 and Zn 2p 1/2 , respectively (Figure 4i). 31 Two peaks at 162.6 and 161.4 eV are observed in Figure 4i, which are respectively identified as S 2p 1/2 and S 2p 3/2 , revealing that S mainly exists in the −2 state in the fabricated CZS catalyst. 30,32 Apparently, the peaks in Cd 3d, Zn 2p, and S 2p show a shift toward the high binding energy (BE) direction, indicating that the interface of CZS and other components generated a strong interaction.…”