Effects of Acceptor Doping to KTaO₃ on Photocatalytic Decomposition of Pure H₂O

Abstract

It was found for the first time that controlling the charge density in oxide semiconductors with an acceptor was effective for improving the activity to photolysis of H 2 O. Although the photodecomposition activity of NiO supported on nondoped KTaO 3 was negligibly small, doping small amount of acceptors such as tri-or tetravalent cations to KTaO 3 increased the formation rate of H 2 and O 2 . In particular, it was found that NiO supported on KTaO 3 doped with 8 mol % Zr 4+ exhibits higher activity to the photocatalytic decomposition of H 2 O than that of a well-known photocatalyst of Pt/TiO 2 .

Investigations of Electronic Structures and Photocatalytic Activities under Visible Light Irradiation of Lead Molybdate Replaced with Chromium(VI)

“…Additionally, it was reasonable from the ionic radius that the cell volume decreased with an increase in the replaced amount. 4 and PbMoO 4 were carried out using two types of unit Figs. 3-5.…”

“…1,2 Recently, new photocatalysts consisting of metal ions with d 0 and d 10 electron configurations have been developed for photocatalytic H 2 and O 2 evolution from water under UV irradiation, one after another. [1][2][3][4][5][6][7][8][9][10] have been also reported as photocatalysts. Especially, the GaN:ZnO photocatalyst is active for water splitting into H 2 and O 2 .…”

“…Especially, the GaN:ZnO photocatalyst is active for water splitting into H 2 and O 2 . 29,30 Some Z-scheme photocatalyst systems, which are active for water splitting under visible light irradiation, have been reported by using SrTiO 3 :Cr,Ta, SrTiO 3 :Rh, and TaON as H 2 evolution photocatalysts, and WO 3 , BiVO 4 , Bi 2 MoO 6 as O 2 evolution photocatalysts. [31][32][33] Therefore, new visible light driven photocatalysts are important even if they are active for half reactions of water splitting in the presence of sacrificial reagents.…”

Strategies To Stabilize New Oxides in the Srn+1(CoTa)nO3n+1 Ruddlesden–Popper Homologous Series

“…Among various interesting reactions, this photoinduced water decomposition into H 2 and O 2 is potentially one of the most promising means of converting photon energy into chemical energy. [9] Complex tantalates such as ATaO 3 (A = Li, Na, K), [10] Sr 2 Ta 2 O 7 , [11] and anhydrous or hydrated A 2 SrTa 2 O 7 (A = H, K, Rb) [12] have quite different chemical compositions and crystal structures, but they share a common feature: [TaO 6 ] Abstract: Two new oxides of the Ruddlesden-Popper series have been isolated and structurally characterized in the Sr-Co-Ta-O system. X-ray and electron diffraction and high-resolution electron microscopy show that polycrystalline Sr 3 CoTaO 7 constitutes the n = 2 member of a new Sr n + 1 - CoTaO 7 correspond to the n = 1 and n = 2 members, respectively.…”

Lithium-induced dielectric relaxations in potassium tantalate ceramics

“…In fact, they are attractive candidates for processing microwave devices, nonvolatile memories and photocatalytic water splitters. [2][3][4] Since KT is very sensitive to impurities, several kinds of substitution ions have been used to study their effect on its properties. In particular, K 1-x Li x TaO 3 (KLT) solid solutions with x<0.…”