A one-step room temperature photo-assisted synthesis has been implemented in liquid phase and under solar light for preparing highly dispersed TiO₂ supported metallic Ru catalysts, with no need of final thermal treatment, external hydrogen, or chemical reductant. Whether RuCl₃ chloride or Ru(acac)₃ acetylacetonate precursor salt was used, sub-nanometric metallic Ru nanoparticles were synthesized on TiO₂ with a sharp size distribution, the high dispersion and the metallic nature of the nanoparticles being evidenced by transmission electron microscopy and X-ray photoelectron spectroscopy. However, the use of the chloride salt was proposed to be more suitable for preparing Ru/TiO₂ catalysts, due to the lower photodeposition efficiency observed with acetylacetonate, that did not allow to synthesize Ru nanoparticles with a loading higher than 1 wt.%. Different reaction mechanisms have been proposed for explaining the behaviour of both TiO₂-salt systems during the Ru nanoparticle synthesis, involving respectively, both holes and electrons charge carriers in oxidation and reduction steps with acetylacetonate, and the sole photogenerated electrons with chloride.

已经在液相和太阳光下进行了一步式室温光辅助合成，以制备高度分散的TiO ₂负载的金属Ru催化剂，而无需最终热处理，外部氢或化学还原剂。无论使用RuCl ₃氯化物还是Ru（acac）₃乙酰丙酮Ru（acac）₃前体盐，都可以在TiO ₂上合成出亚纳米级的金属Ru纳米颗粒，其粒径分布清晰，透射电子显微镜和透射电镜证实了纳米颗粒的高分散性和金属性质。 X射线光电子能谱。然而，建议使用氯化物盐更适合于制备Ru / TiO _2。由于用乙酰丙酮化物观察到较低的光沉积效率，因此该催化剂不能合成负载高于1 wt。％的Ru纳米颗粒。已经提出了不同的反应机理来解释Ru纳米颗粒合成过程中TiO _2-盐体系的行为，分别涉及在乙酰丙酮酸盐的氧化和还原步骤中空穴和电子载流子，以及与氯化物的唯一光生电子。