Robust and highly active photocatalysts, CdS@MoS, for hydrogen evolution were successfully fabricated by one-step growth of oxygen-incorporated defect-rich MoS ultrathin nanosheets on the surfaces of CdS with irregular fissures. Under optimized experimental conditions, the CdS@MoS displayed a quantum yield of ∼24.2% at 420 nm and the maximum H generation rate of ∼17203.7 umol/g/h using NaS-NaSO as sacrificial agents (λ ≥ 420 nm), which is ∼47.3 and 14.7 times higher than CdS (∼363.8 μmol/g/h) and 3 wt % Pt/CdS (∼1173.2 μmol/g/h), respectively, and far exceeds all previous hydrogen evolution reaction photocatalysts with MoS as co-catalysts using NaS-NaSO as sacrificial agents. Large volumes of hydrogen bubbles were generated within only 2 s as the photocatalysis started, as demonstrated by the photocatalytic video. The high hydrogen evolution activity is attributed to several merits: (1) the intimate heterojunctions formed between the MoS and CdS can effectively enhance the charge transfer ability and retard the recombination of electron-hole pairs; and (2) the defects in the MoS provide additional active S atoms on the exposed edge sites, and the incorporation of O reduces the energy barrier for H evolution and increases the electric conductivity of the MoS. Considering its low cost and high efficiency, this highly efficient hybrid photocatalysts would have great potential in energy-generation and environment-restoration fields.

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Oxygen vacancy-rich WOx/C nanowire networks are fabricated by a one-pot and high yield solvothermal method, exhibiting ultrafast and high adsorption capacities.

Photocatalytic hydrogen evolution has broad prospects as a clean solution for the energy crisis. However, the rational design of catalyst complex, the H 2 evolution efficiency, and the yield are great challenge. Herein, three-dimensional hierarchical g-C 3 N 4 architectures assembled by ultrathin carbon-rich nanosheets (3D CCNS) were prepared via an extremely facile hexamethylenetetramine activation approach at the bulk scale, indicating the validation of scale-up production process. The two-dimensional ultrathin carbon-rich nanosheets were several hundred nanometers in width but only 5−6 nm in thickness and gave rise to a unique 3D interconnected network. The unique composition and structure of the nanosheets endow them with a remarkable light absorption spectrum with the tunable band gap, high electrical conductivity, fast charge separation, and large surface areas with abundant reaction active sites, and thus significantly improved H 2 production performance. As high as ∼7.8%, quantum efficiency can be achieved by irradiating 3D CCNS at 420 nm with a H 2 evolution rate >2.7 × 10 4 μmol/g/h, which is ∼31.3 times higher than that of the pristine g-C 3 N 4 . Our work introduces an extremely facile route for mass production of doping modified 3D g-C 3 N 4 -based photocatalyst with excellent H 2 evolution performances. KEYWORDS: 3D hierarchical g-C 3 N 4 architectures, ultrathin self-doped nanosheets, tunable band structures, photocatalytic hydrogen evolution

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