CuInS2-based photocatalysts for photocatalytic hydrogen evolution via water splitting

Regulating Deep and Shallow Defects of CuInS2 Quantum Dots To Enhance Photocatalytic Hydrogen Production

“…The use of fossil fuels also releases large amounts of greenhouse gases (CO 2 ), and the concentration of carbon dioxide in the atmosphere has increased from 280 ppm before preindustrial period to 413.2 ppm. , As an efficient and clean energy source, hydrogen energy has the advantages of being storable and renewable and has the highest energy density (142 MJ·kg –1 ) among all chemical fuels, which makes it a hot research topic for alleviating energy shortage and environmental pollution . Using photocatalytic decomposition of water to produce H 2 is one of the most ideal ways to fundamentally solve the energy and environmental problems and also the way to prevent the environmental pollution caused by fossil energy. − Semiconductor QDs are a widely studied new catalyst in the field of solar hydrogen production. − Recently, various semiconductor QDs have been widely studied as photoabsorbers in heterogeneous or homogeneous photocatalytic systems. − Unfortunately, early QDs maintained a low photocatalytic efficiency due to excessive electron–hole recombination, poor exciton separation efficiency, and limited active sites. Thereafter, strategies such as surface engineering, element doping, , loading cocatalyst, defect engineering, − and heterojunction have been developed to improve the photocatalytic efficiency.…”

“…Moreover, the ultrahigh specific surface area of QDs makes them have more high-energy surface atoms, which can be used as potential photocatalytic active sites to improve the separation efficiency of electron–hole pairs . Qi and Tian introduced the synthesis method of CIS QDs, the pathway of enhancing photocatalytic activity, and the promise of QDs for photocatalytic degradation, H 2 production, and CO 2 reduction. , Shi and co-workers recombined Cu–In–Zn-S QDs with carbon QDs/MoS 2 to deeply discuss the electron/hole transfer mechanism of composites. , Based on these advantages, some research groups have attempted to use water-soluble CuInS 2 QDs as photocatalysts in hydrogen production systems. Wu et al prepared Cu x In y S with a nonstoichiometric ratio and applied it to photocatalytic hydrogen production.…”

“…30 Qi and Tian introduced the synthesis method of CIS QDs, the pathway of enhancing photocatalytic activity, and the promise of QDs for photocatalytic degradation, H 2 production, and CO 2 reduction. 12, 13 Shi and co-workers recombined Cu−In−Zn-S QDs with carbon QDs/MoS 2 to deeply discuss the electron/hole transfer mechanism of composites. 18,20 Based on these advantages, some research groups have attempted to use water-soluble CuInS 2 QDs as photocatalysts in hydrogen production systems.…”

Investigation of Tungsten‐Based Seleno‐Chevrel Compounds with Different Compositions for Efficient Water Splitting

“…[ 14 ] However, CuInS 2 has some drawbacks like photo‐corrosion, high cost of In element, etc. [ 14 ] Cu 2 ZnSnS 4 is an another emerging material for the photocatalytic water splitting with non‐toxic and earth‐abundant elements, low band gap, etc. [ 15 ] Despite these properties, Cu 2 ZnSnS 4 has some issues to be considered as phase composition, crystallinity, relatively narrow band gap, etc.…”

Recent advances in photocatalytic hydrogen evolution of AgIn5S8‐based photocatalysts

“…Ternary metal sulfide (TMS) photocatalyst generally possesses the semiconductor properties of tunable band structure, suitable bandgap, flexible element compositions, and high activity, which can effectively overcome the drawbacks of the traditional BMS photocatalysts to some extent. [40][41][42][43][44][45][46][47][48][49] Among the developed TMSs, the Ag-based photocatalysts own the unique advantages of extremely high photostability and environmentalfriendly elements, which are the earliest developed TMS photocatalysts in PHE application. [50] Among them, the AgIn 5 S 8 possesses the suitable bandgap of 1.7-2.0 eV and high light absorption coefficient, which can effectively realize the visible-light PHE.…”