Abstract
We prepared NaTaO3 by hydrothermal method and solvothermal method. Na2Ta2O6 was obtained by hydrothermal treatment of water soluble tantalum complex and NaOH. On the other hand NaTaO3 was obtained by solvothermal treatment of TaCl5 and NaOH in methanol. Many samples were synthesized in various hydrothermal condition, however all samples were Na2Ta2O6 or amorphous. Primary particle size of samples obtained by solvothermal method was 10 nm. Primary particles aggregated and formed 20-50 nm secondly particles. Moreover, specific surface area of NaTaO3 synthesized by the solvothermal method was 109 m2/g. Therefore we succeeded in obtaining NaTaO3 fine particles with high specific surface area. NaTaO3 sample loaded NiO of 6 wt% produced H2 of 600 μmol/h. When solvothermal treatment time was extended from 5 hours to 10 hours and stirring in solvothermal treatment, water splitting activity of NaTaO3 was improved.
