Enhancement of hydrogen evolution yield from water dispersing nanoparticles irradiated with gamma-ray

Hydrogen gas evolution from water dispersing nanoparticles induced by Co-60 gamma -ray irradiation was studied. Nanoparticles of TiO2 and Al2O3 with a verage sizes of 7-33 nm supplied from several suppliers were examined. It w as indicated that reactions enhancing the hydrogen evolution proceed on par ticle's surface. It was implied that the yield depends on size of agglomera ted particle regardless of their primary particle size and chemical species . Reactions that enhance the hydrogen yields were discussed, and radiolysis process was concluded dominant in the total enhancement mechanism.