  In this work, we demonstrate that a well-established and facile ball milling
approach using mixtures of commercial anatase nanoparticles and TiH2 introduces
noble-metal-free photocatalytic H2 activity to titania. We characterize this
synergistic effect in view of the nature of defects, state of hydroxylation,
and investigate the effect on the energetics and kinetics of electronic states
and the resulting H2 evolution performance.
