High-performance heterostructured CdS/Ba1−xSrxTiO3 system with unique synergism for photocatalytic H2 evolution

Dynamically Optimized Multi-interface Novel BiSI-Promoted Redox Sites Spatially Separated n–p–n Double Heterojunctions BiSI/MoS2/CdS for Hydrogen Evolution

“…For example, as a stable nonprecious metal sulfide, the p-type semiconductor MoS 2 has been widely studied. − Studies show that it can work as an efficient cocatalyst due to its lower Eg and unique samdwich conformation. Previous studies have shown that it is constructed by three parallel S–Mo–S layers. ,− The experimental results also showed that the photoactivity CdS was improved after combination of MoS 2 . ,,− …”

“…What’s more, its conduction band potential is very suitable for reducing water. However, it also has serious shortcomings; for example, the carriers are easy to compound and the photocorrosion phenomenon is quite serious. − To solve these problems, usually a cocatalyst is introduced into the CdS system. The research findings show that cocatalyt has the ability to promote carrier separation, providing more active reaction sites and reducing the overpotential of hydrogen generation. ,,− , …”

Strontium-induced phase, energy band and microstructure regulation in Ba1−xSrxTiO3photocatalysts for boosting visible-light photocatalytic activity

“…Recently, the use of strontium ions to occupy the A-site ions of BaTiO 3 to form Ba 1−x Sr x TiO 3 (BST) photocatalysts can be widely used in the photocatalytic decomposition of water to produce hydrogen and dye degradation. [25][26][27][28][29][30][31][32] However, no researchers have yet regulated the phase structure, morphology and photocatalytic activity of BST photocatalysts for photocatalytic degradation of tetracycline hydrochloride (TC-HCl) under simulated sunlight irradiation by adjusting the content of strontium ions. The polyacrylamide gel method is an effective method to synthesize ion-doped semiconductor photocatalysts, but it has not been used to synthesize BST photocatalysts.…”

Phase-Modificate Defects Engineering CdS Sphalerite-Wurtzite System for Efficient Photocatalytic H2 Evolution under Visible Light Irradiation

“…As shown above, cadmium sulfide is labile and easy to be decomposed into sulfur, then release poisonous cadmium ions under irradiation. − Many methods have been investigated to inhibit the rates of both CdS photocorrosion and the recombination photogenerated carriers, such as constructing heterojunctions, introducing cocatalysts, and so on. , Precious metals, for instance, platinum and gold, are utilized to be cocatalysts; however, they are too expensive to be widely used. Thus, it is also significant to develop inexpensive and earth-abundant efficient cocatalysts. − MoS 2 , with an intercalated construction of trilaminar atomic shell (S–Mo–S) fitted together through intermolecular force, already has been applied to many aspects. − Simulation by density functional theory indicated that the Helmholtz function of H bond to MoS 2 is on the brink of nought, which can be mentioned in the same breath with platinum and make it a kind of prospective inexpensive and massive cocatalyst. Various research results testified that it is hopeful to become an effective cocatalyst on account of the quite small forbidden bandwidth and representative laminated construction. − However, the photocatalytic activity for hydrogen evolution by MoS 2 embellished CdS is far below meeting the needs of industrial application. − Many researchers keep on looking for materials with smaller forbidden bandwidths and suitable positions to modify MoS 2 /CdS to further strengthen its property. − For example, Yu et al reported first a facile one-pot strategy with biomolecule assistance to fabricate novel hollow spheres, which led to a superior high photoactive activity for water splitting by visible light without noble metals .…”

“…Therefore, we aim to construct a CdS self-modified defects-engineering system with fewer surface states. Based on the quantum effect, the forbidden bandwidth of a semiconductor material can be changed by nanoparticle size; the smaller the size, the larger the band gap. ,,− Therefore, the transformation of CdS from block to nanoscale leads to a deviation of absorb scope toward the shortwave direction. Thus, it may be possible to realize effective separation of carriers in CdS phase-modificate composite system because of the existence of energy level differences.…”