Novel BiVO₄@ZnIn₂S₄/Ti₃C₂ MXene quantum dots (QDs) assembly all-solid-state direct Z-scheme photocatalyst is fabricated via in-situ growth combined with two-step solvothermal strategy, which forms a hierarchical core-shell structure. The proper energy band structure of BiVO₄ and ZnIn₂S₄ and the formation of a good solid-solid contact interface between them promote the construction of Z-scheme system, which achieves effective charge separation. It is surprisingly discovered that Ti₃C₂ MXene QDs can be applied as cocatalysts for photocatalytic overall water splitting, which could accelerate the surface redox kinetics of the catalyst due to the unique properties of Ti₃C₂ MXene QDs. In particular, due to its excellent metal conductivity, a Schottky barrier can be formed at the interface in contact with ZnIn₂S₄, further promoting charge separation. BiVO₄@ZnIn₂S₄/Ti₃C₂ MXene QDs achieves effective visible-light-driven pure water splitting into O₂ and H₂ evolution rates up to 50.83 and 102.67 μmol g⁻¹ h⁻¹ (~1:2). In addition, it also shows high photocatalytic degradation Bisphenol A efficiency of ~96.4 %. The high photocatalytic performance can be ascribed to the all-solid-state direct Z-scheme structure favoring spatial charge separation, Ti₃C₂ MXene QDs as cocatalysts promoting proton reduction, and hierarchical core-shell structure offering more surface active sites. This work provides new insights to fabricate high-performance direct Z-scheme assembly system.

通过原位生长结合两步溶剂热策略制备新型BiVO ₄ @ZnIn ₂ S ₄ / Ti ₃ C ₂ MXene量子点组装全固态直接Z型光催化剂。 -壳结构。BiVO ₄和ZnIn ₂ S ₄的适当能带结构以及它们之间良好的固-固接触界面的形成促进了Z方案体系的构建，从而实现了有效的电荷分离。令人惊讶地发现，Ti ₃ C ₂MXene QDs可用作光催化整体水分解的助催化剂，由于Ti ₃ C ₂ MXene QDs的独特性能，可加速催化剂的表面氧化还原动力学。特别地，由于其优异的金属导电性，可以在与ZnIn ₂ S ₄接触的界面处形成肖特基势垒，从而进一步促进电荷分离。BiVO ₄ @ZnIn ₂ S ₄ / Ti ₃ C ₂ MXene QDs实现了有效的可见光驱动的纯水分解，分解成O ₂和H _2的速率高达50.83和102.67μmolg ^-1 h^-1（〜1：2）。另外，它还显示出高的光催化降解双酚A效率，约为96.4％。高光催化性能可归因于全固态直接Z方案结构，有利于空间电荷分离； Ti ₃ C ₂ MXene QDs作为促进质子还原的助催化剂；以及分层的核-壳结构，可提供更多的表面活性位。这项工作为制造高性能直接Z方案组装系统提供了新见解。