In this work, an attempt has been made to strategically and systematically design novel and multifunctional nanocomposite photocatalysts by coupling mesocrystals of CaTiO₃ with edge‐sulfur‐atoms‐enriched MoS₂ and reduced graphene oxide (RGO) nanosheets. A remarkable enhancement in photocatalytic activity could be evidenced with an optimized content (20 %) of MoS₂−RGO nanosheets coupled with CaTiO₃ mesocrystals. This nanocomposite showed a 33‐fold enhanced photocatalytic hydrogen evolution in comparison to bare CaTiO₃, with apparent quantum efficiencies of 5.4 %, 3.0 % and 17.7 % at 365, 420 and 600 nm monochromatic wavelengths. In addition, the excellent adsorptive degradation of different organic pollutants was also achieved with these photocatalysts, which revealed their multifunctional behavior. The enhanced photocatalytic performance can be accredited mainly to following factors: (i) Intimate contact between constituent materials and efficient charge transfer across the ternary heterojunction, which suppresses photogenerated charge recombination; (ii) The high surface area provides abundant sites for reactant adsorption and further reaction; (iii) Defect‐rich MoS₂ with sulfur atoms on the exposed edges provide sticky sites for H⁺ ions and hence enhance the hydrogen generation. The design strategy employed in this work can be adopted to improve the properties and performance of other mesocrystals, which can lead to the fabrication of low‐cost and multifunctional catalysts for diverse applications.

中文翻译：

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CaTiO3的中间晶体与还原的氧化石墨烯纳米片上的边缘硫原子富集的MoS2之间的相互作用：阳光照射下增强的光催化性能

在这项工作中，已经尝试通过将CaTiO _3的介晶与边缘硫原子富集的MoS ₂和还原的氧化石墨烯（RGO）纳米片偶联，从战略上和系统上设计新颖的多功能纳米复合光催化剂。MoS ₂ -RGO纳米片的最佳含量（20％）与CaTiO ₃介晶相结合可以证明光催化活性显着提高。与裸露的CaTiO ₃相比，这种纳米复合材料显示出33倍的光催化氢释放在365、420和600 nm单色波长处的表观量子效率分别为5.4％，3.0％和17.7％。此外，这些光催化剂还实现了对不同有机污染物的出色吸附降解，从而揭示了它们的多功能行为。增强的光催化性能可主要归因于以下因素：（i）组成材料之间的紧密接触和跨三元异质结的有效电荷转移，从而抑制了光生电荷的复合；（ii）高表面积为反应物吸附和进一步反应提供了丰富的位置；（iii）暴露边缘上带有硫原子的富缺陷MoS ₂提供了H ^+的粘性位点离子，从而增强了氢的产生。可以采用这项工作中采用的设计策略来改善其他介晶的性能和性能，从而可以制造出低成本，多功能的催化剂，以用于各种应用。