Few‐Layered Mo_xW_1−xS₂‐Modified CdS Photocatalyst: One‐Step Synthesis with Bifunctional Precursors and Improved H₂‐Evolution Activity

Abstract

Introducing W into MoS2 to fabricate Mo x W1−x S2 is a promising strategy to optimize the active‐site density and electrical conductivity of MoS2 to further improve its H2‐evolution efficiency. However, limited attention has been paid to developing facile and effective methods to prepare a Mo x W1−x S2 H2‐evolution cocatalyst, especially the few‐layered Mo x W1−x S2, to boost the photocatalytic H2‐evolution activity of host photocatalyst materials. Herein, a well‐designed Mo x W1−x S2 cocatalyst with a few‐layered structure of 5–7 layers and an interlayer spacing of 0.65 nm is in‐situ grown on the CdS surface via a simple one‐step solvothermal method with (NH4)2MoS4 and (NH4)2WS4 as the dual‐functional precursors. In this case, the above dual‐functional precursors can not only transform into the few‐layered Mo x W1−x S2 cocatalyst but also provide abundant S2− ions for the formation of the CdS host photocatalyst. The photocatalytic H2‐evolution results declare that the Mo0.5W0.5S2/CdS photocatalyst acquires the highest H2‐evolution rate of 2968.1 μmol h−1 g−1, which is higher than that of MoS2/CdS by a factor of 3.5. The remarkably promoted H2‐evolution activity of the few‐layered Mo x W1−x S2/CdS is mainly ascribed to the speedy electron transport and efficient H2‐evolution reaction via the Mo x W1−x S2 cocatalyst on CdS surface by W‐introduction.

Bifunctional thioacetamide-mediated synthesis of few-layered MoOSx nanosheet-modified CdS hollow spheres for efficient photocatalytic H2 production

“…10A). 53–55 Additionally, with reference to pristine CdS, a lower overpotential in the LSV curves and smaller arc radius in the EIS spectra observed for the few-layered MoOS x /CdS sample validate the boosted interfacial H 2 -evolution dynamics and accelerated migration of photoexcited electrons, respectively (Fig. 10B and C).…”

Increasing unsaturated Se number and facilitating atomic hydrogen adsorption of WSe2+x nanodots for improving photocatalytic H2 production of TiO2

“…5c). 46 The Se 3d spectra can further reveal the detailed microstructure information of Se-enriched WSe 2+ x (Fig. 5d).…”

CdIn2S4‐xSex Solid‐Solution Nanocrystal Photocatalyst: One‐Step Hydrothermal Synthesis, Controllable Band Structure, and Improved H2‐Evolution Activity

“…Compared with the pure CdIn 2 S 4 , the CdIn 2 S 4‐ x Se x ( x = 0.4) sample shows a greater photocurrent response and smaller arc radius, indicating that the photogenerated charges can be well separated and transferred in CdIn 2 S 4‐ x Se x ( x = 0.4). [ 61–63 ] Therefore, the introduction of Se to form a CdIn 2 S 4‐ x Se x solid solution is a good strategy to achieve the improved photocatalytic activity, which not only can reduce the overpotential of hydrogen production, but also increase the transfer speed of photogenerated carriers.…”