Scalable photocatalytic and antifouling applications for thin films can be attained by extending the light absorption ability of titanium dioxide (TiO2) from ultra violet to the visible range through hydrogenation. TiO2 thin films and TiO2 nanostructures grown on titanium substrate were subjected to hydrogenation in high temperature low pressure CVD chamber. The absorption enhancement after hydrogenation was produced without the use of any conventional diatomic hydrogen dissociation catalyst such as platinum. In our study, the titanium substrate itself was the active component in driving the hydrogen dissociation and diffusion. In this way, photocatalytic thin films are scalable and cost-effective. Using hydrogenation, a 50% enhancement in chemically-deposited films and a 21% enhancement in ebeam-deposited films for methylene blue photocatalytic degradation is achieved. As the TiO2 deposition with simple chemical-etching is shown to be highly effective, the TiO2 nanostructures grown on titanium mesh performs as a scalable and highly effective photocatalytic device. Finally, fundamental physical insight of the TiO2 hydrogenation dynamics is provided to distinguish the optical effects of various processing conditions.