Ag‐TiO₂‐graphene (ATG) ternary nanocomposites with various Ag contents were synthesized at fixed mixing ratios of TiO₂ to graphene. The successful fabrication of them was confirmed by XRD, SEM, TEM, Raman and XPS spectra. The stronger Raman signals caused by the increased Ag content were considered as a significant evidence for the SPR effect. An increased Ag content gave rise to not only a wider absorption range but also a higher visible‐light absorbance. The results of electrochemical analysis illustrated that more Ag loading caused a reduced interfacial impedance, and improved conductivity and electron transport. However, excess Ag nanoparticles led to agglomeration and decreased surface area unfavorable to light absorption. Thus, an appropriate Ag content was required to achieve higher optical response and photocatalytic efficiency. It was found that for each fixed mixing ratio of TiO₂ and graphene, there was a corresponding optimum Ag content. The hydrogen evolution results displayed the same trend as photodegradation, indicating again that the optimum ratio of TiO₂ and graphene was 5: 1, and the extent of Ag loading was really crucial. By appropriate ratios of graphene and Ag, A₁₅TG(5) exhibited the highest efficiency in both photodegradation and hydrogen evolution. Its QE and mass‐normalized hydrogen evolution rate were 26.2% and 705.6 μmol⋅g⁻¹⋅h⁻¹, respectively. Furthermore, the ATG nanocomposites also showed promising capability for bacterial inactivation.

中文翻译：

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Ag比例合适的Ag-TiO2-石墨烯三元纳米复合材料的氢气释放和细菌失活效率高

以固定的TiO ₂混合比合成具有不同Ag含量的Ag-TiO _2-石墨烯（ATG）三元纳米复合材料石墨烯。XRD，SEM，TEM，拉曼和XPS光谱证实了它们的成功制造。由Ag含量增加引起的更强的拉曼信号被认为是SPR效应的重要证据。Ag含量的增加不仅导致吸收范围更广，而且可见光吸收率也更高。电化学分析的结果表明，更多的银负载导致界面阻抗降低，电导率和电子传输改善。然而，过量的Ag纳米颗粒导致团聚并且减少不利于光吸收的表面积。因此，需要适当的Ag含量以实现更高的光学响应和光催化效率。发现对于每种固定的TiO ₂混合比和石墨烯，存在相应的最佳Ag含量。氢析出结果显示出与光降解相同的趋势，再次表明TiO ₂和石墨烯的最佳比例为5：1，并且Ag的负载量确实至关重要。通过适当比例的石墨烯和银，A ₁₅ TG（5）在光降解和析氢方面均显示出最高效率。它的QE和质量归一化的氢气释放速率分别为26.2％和705.6μmol·g ^-1· h ^-1。此外，ATG纳米复合材料还显示出有希望的细菌灭活能力。