[en] Hydrogen is an attractive non-carbonaceous storable fuel. A promising approach for clean and sustainable hydrogen production is solar driven photoelectrochemical water-splitting. This project aims to modify the properties of TiO₂ used as a photoanode, in order to enhance the photoelectrochemical hydrogen production. Designing TiO₂ at the nanometric scale with nanotubes is an interesting way to enhance both its reactivity and spatial separation of photogenerated carriers. A co-alloying strategy was investigated. The large introduction of anions (N^3-) and cations (Nb⁵⁺,Ta⁵⁺) in the lattice was found to be an efficient way to reduce the band gap energy of TiO₂, allowing absorption of photons in the visible range. The annealing parameters under ammonia, used for the nitrogen doping, have been optimized. A parametric study on the pulsed laser deposition of co-catalysts (cobalt, nickel) on TiO₂ NTs was performed. The chemical composition of the co-catalysts can be controlled with the background atmosphere used during the deposition. Under the optimal conditions determined after this study, a significant improvement of photoelectrochemical hydrogen production under both solar and visible light was reached. Combining the co-alloying approach and the co-catalysts deposition leads to tripling the hydrogen production under solar light. In order to have a better understanding of the mechanisms involved, more specific studies have been performed. (author)