title: Heterostructured WS2-MoS2Ultrathin Nanosheets Integrated on CdS Nanorods to Promote Charge Separation and Migration and Improve Solar-Driven Photocatalytic Hydrogen Evolution.
abstract: Solar-driven photocatalytic hydrogen evolution is important to bring solar-energy-to-fuel energy-conversion processes to reality. However, there is a lack of highly efficient, stable, and non-precious photocatalysts, and catalysts not designed completely with expensive noble metals have remained elusive, which hampers their large-scale industrial application. Herein, for the first time, a highly efficient and stable noble-metal-free CdS/WS2-MoS2nanocomposite was designed through a facile hydrothermal approach. When assessed as a photocatalyst for water splitting, the CdS/WS2-MoS2nanostructures exhibited remarkable photocatalytic hydrogen-evolution performance and impressive durability. An excellent hydrogen evolution rate of 209.79 mmol g-1h-1was achieved under simulated sunlight irradiation, which is higher than the values for CdS/MoS2(123.31 mmol g-1h-1) and CdS/WS2nanostructures (169.82 mmol g-1h-1) and the expensive CdS/Pt benchmark catalyst (34.98 mmol g-1h-1). The apparent quantum yield reached 51.4 % at λ=425 nm in 5 h. Furthermore, the obtained hydrogen evolution rate was better than those of several noble-metal-free catalysts reported previously. The observed high rate of hydrogen evolution and remarkable stability may be a result of the ultrafast separation of photogenerated charge carriers and transport between the CdS nanorods and the WS2-MoS2nanosheets, which thus increases the number of electrons involved in hydrogen production. The proposed designed strategy is believed to potentially open a door to the design of advanced noble-metal-free photocatalytic materials for efficient solar-driven hydrogen production.
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea.
authors.forename: D Amaranatha
authors.initials: DA
authors.lastname: Reddy
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea.
authors.forename: Hanbit
authors.initials: H
authors.lastname: Park
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea.
authors.forename: Rory
authors.initials: R
authors.lastname: Ma
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea.
authors.forename: D Praveen
authors.initials: DP
authors.lastname: Kumar
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea.
authors.forename: Manho
authors.initials: M
authors.lastname: Lim
authors.affiliation: Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea.
authors.forename: Tae Kyu
authors.initials: TK
authors.lastname: Kim
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D002384:Catalysis; D004220:Disulfides / Q000737:chemistry*; D004579:Electron Transport; D006859:Hydrogen / Q000737:chemistry*; D008982:Molybdenum / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D055668:Photochemical Processes; D013440:Sulfides / Q000737:chemistry*; D013472:Sunlight; D014867:Water / Q000737:chemistry
chemical_list: D019187:Cadmium Compounds; D004220:Disulfides; D013440:Sulfides; C034939:cadmium sulfide; D014867:Water; D006859:Hydrogen; D008982:Molybdenum; C082964:molybdenum disulfide
keywords: cadmium; hydrogen; molybdenum; nanohybrids; tungsten; water splitting