Abstract A simple strategy has been reported for the construction of Z-scheme heterojunction, using precious metal (Au)-carbon quantum dots (CQDs)-graphite carbonitride (g-C3N4)/titanium dioxide (TiO2) superposition. These components maximize the efficiency of resulted composite, including the local surface plasmonic resonance effect of the precious metal, the conversion photoluminescence (PL) characteristics of CQDs, and the doping characteristics of g-C3N4/TiO2 complementary materials. The composition, morphology, and photoelectric properties of the composites are characterized. It is found that the nano-Au particles and CQDs are evenly dispersed on g-C3N4/TiO2, and the composite material has effective e-/h+ pairs separation, excellent electron transfer, reasonable band gap width, and good visible light utilization ability. Subsequently, the catalytic decomposition of water by the composites under the simulated solar drive exhibited excellent hydrogen production performance, which proves the effectiveness of our proposed material design strategy. Besides, the reaction and photocatalytic mechanism of the material preparation are discussed, and a possible catalytic mechanism has been proposed. Finally, we found that the excellent photocatalytic performance of our catalyst is due to the Z-scheme heterojunction and the associated advantages of respective components.

中文翻译：

---

用于太阳能驱动高效光催化制氢的 g-C3N4/TiO2/CQDs/Au Z 型异质结复合材料的简便合成

摘要 已经报道了一种使用贵金属 (Au)-碳量子点 (CQDs)-碳氮化石墨 (g-C3N4)/二氧化钛 (TiO2) 叠加构建 Z 型异质结的简单策略。这些组件最大限度地提高了所得复合材料的效率，包括贵金属的局部表面等离子体共振效应、CQD 的转换光致发光 (PL) 特性以及 g-C3N4/TiO2 互补材料的掺杂特性。表征了复合材料的组成、形貌和光电性能。发现纳米金粒子和CQDs均匀地分散在g-C3N4/TiO2上，复合材料具有有效的e-/h+对分离、优异的电子转移、合理的带隙宽度和良好的可见光利用能力。随后，在模拟太阳能驱动下复合材料对水的催化分解表现出优异的制氢性能，这证明了我们提出的材料设计策略的有效性。此外，还讨论了材料制备的反应和光催化机理，并提出了可能的催化机理。最后，我们发现我们的催化剂优异的光催化性能是由于 Z 型异质结和各个组分的相关优势。并提出了可能的催化机制。最后，我们发现我们的催化剂优异的光催化性能是由于 Z 型异质结和各个组分的相关优势。并提出了可能的催化机制。最后，我们发现我们的催化剂优异的光催化性能是由于 Z 型异质结和各个组分的相关优势。