Influence of nickel in the hydrogen production activity of TiO2

- Adding NiNO3 to the TiO2 sol-gel synthesis process improves hydrogen production.
- Formic acid is not detected in the methanol oxidation.
- The optimum post-calcination temperature is 550 °C (260.76 μmol h−1).
- The formation of NiTiO3 at the highest temperatures inhibits photoactivity.