A recent study involved the irradiation of a combination of Ag or Ag2O doped MgO with infrared (IR) light in the presence of a methanol/water solution . Under these circumstances, hydrogen generation was detected upon sonication (Fig. .a), but no hydrogen was produced in the absence of IR light or when the mixture was irradiated solely with the water/methanol solution without any catalyst . Furthermore, no hydrogen was generated when the Ag (Ag2O)/MgO catalyst was subjected to IR irradiation in the absence of sonication. The findings indicate that hydrogen generation results from the synergistic effects of sonication and infrared light, implying that sonication facilitates a multi-step, sub-band gap excitation of electrons in MgO, thereby augmenting the catalytic activity of Ag/Ag2O-coated MgO nanoparticles, as illustrated in Fig. .b .