The effect of reoxidation time during the preparation of Ni-loaded CsLa₂Ti₂NbO₁₀ on the photocatalytic hydrogen production in water decomposition reaction

The photocatalytic decomposition of water for H₂ evolution over 1wt.% Ni/CsLa₂Ti₂NbO₁₀ was investigated according to the reoxidation time during the preparation. The dependence of photocatalytic activity on the reoxidation time was examined by XRD, UV-Vis, TEM and TPR. With the increase in the reoxidation time, the H₂ evolution increased gradually. The maximum H₂ evolution (212μmol/hg-cat) was observed when the catalyst was reoxidized at 200°C for 2h. It is because of the small particle size of 10nm and homogenous Ni/NiO distribution. The drastic decrease of photocatalytic activity for samples reoxidized for 4h was due to the partial formation of NiO bulk phase and the growth of nickel particles.