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首页> 外文期刊>RSC Advances >Efficient photocatalysis with graphene oxide/Ag/Ag2S–TiO2 nanocomposites under visible light irradiation
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Efficient photocatalysis with graphene oxide/Ag/Ag2S–TiO2 nanocomposites under visible light irradiation

机译：可见光照射下氧化石墨烯/ Ag / Ag2S-TiO2纳米复合材料的高效光催化

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Lack of visible light response and low quantum yield hinder the practical application of TiO _(2) as a high-performance photocatalyst. Herein, we present a rational design of TiO _(2) nanorod arrays (NRAs) decorated with Ag/Ag _(2) S nanoparticles (NPs) synthesized through successive ion layer adsorption and reaction (SILAR) and covered by graphene oxide (GO) at room temperature. Ag/Ag _(2) S NPs with uniform sizes are well-dispersed on the TiO _(2) nanorods (NRs) as evidenced by electron microscopic analyses. The photocatalyst GO/Ag/Ag _(2) S decorated TiO _(2) NRAs shows much higher visible light absorption response, which leads to remarkably enhanced photocatalytic activities on both dye degradation and photoelectrochemical (PEC) performance. Its photocatalytic reaction efficiency is 600% higher than that of pure TiO _(2) sample under visible light. This remarkable enhancement can be attributed to a synergy of electron-sink function and surface plasmon resonance (SPR) of Ag NPs, band matching of Ag _(2) S NPs, and rapid charge carrier transport by GO, which significantly improves charge separation of the photoexcited TiO _(2) . The photocurrent density of GO/Ag/Ag _(2) S–TiO _(2) NRAs reached to maximum ( i.e. 6.77 mA cm ~(?2) vs. 0 V). Our study proves that the rational design of composite nanostructures enhances the photocatalytic activity under visible light, and efficiently utilizes the complete solar spectrum for pollutant degradation.
机译：缺乏可见光响应和低量子产率阻碍了TiO_（2）作为高性能光催化剂的实际应用。在这里，我们提出了通过连续离子层吸附和反应（SILAR）合成并被氧化石墨烯（GO）覆盖的Ag / Ag _（2）S纳米颗粒（NPs）装饰的TiO _（2）纳米棒阵列（NRA）的合理设计。 ） 在室温下。电子显微镜分析证明，具有均匀尺寸的Ag / Ag _（2）S NPs很好地分散在TiO _（2）纳米棒（NRs）上。用光催化剂GO / Ag / Ag _（2）S装饰的TiO _（2）NRA显示出更高的可见光吸收响应，从而显着增强了对染料降解和光电化学（PEC）性能的光催化活性。在可见光下，其光催化反应效率比纯TiO _（2）样品高600％。这种显着增强可归因于Ag NP的电子吸收功能与表面等离振子共振（SPR），Ag _（2）S NP的能带匹配以及GO的快速载流子输运的协同作用，从而显着改善了C的电荷分离。光激发的TiO _（2）。 GO / Ag / Ag _（2）S–TiO _（2）NRA的光电流密度达到最大值（即6.77 mA cm〜（？2）vs. 0 V）。我们的研究证明，合理设计复合纳米结构可增强可见光下的光催化活性，并有效利用完整的太阳光谱进行污染物降解。

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