Perovskite-type NaTa O3 derived from a sol-gel synthesis exhibited a larger surface area and a remarkably higher photocatalytic activity in water splitting than the solid-state synthesized NaTa O3. The sol-gel and solid-state NaTa O3 had different crystalline structures of monoclinic P2m and orthorhombic Pcmn, respectively. Diffuse reflectance spectra showed that the sol-gel specimen had a slightly larger band gap. The band structure analysis revealed an indirect band gap for the sol-gel NaTa O3, contrary to the direct band gap of the solid-state one. The difference in the electronic structure and surface area explained the higher photocatalytic activity of the sol-gel NaTa O3.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)