Tetragonal tungsten bronze-type nanorod photocatalysts with tunnel structures: Ta substitution for Nb and overall water splitting

Abstract

Tetragonal tungsten bronze-type tantalum (Ta) substituted Sr2KNb5O15 nanorod photocatalysts with tunnel structures were prepared by a facile and low-cost molten salt method using potassium chloride (KCl) at 850 °C for only 2 h.

Fabrication of well-shaped Sr2KTa5O15 nanorods with a tetragonal tungsten bronze structure by a flux method for artificial photosynthesis

“…Sr 2 KTa 5 O 15 nanorods fabricated in KCl flux in a lower calcination temperature and shorter time showed the highest photocatalytic activity and good selectivity toward CO evolution comparing with that of samples fabricated using SSR method. This might be due to the formation of regular morphology of photocatalyst, these nanorods were grown along the [001] direction, which was reported by Wang et al [24]. The nanorods were also reported to be more efficiency for migration of photogenerated electrons and holes than that of nanoparticles [23], which should be responsible for the high photocatalytic activity of CO 2 conversion by H 2 O.…”

“…1B. The other peaks in the samples are consistent with those of TTB-type Sr 2 KTa 5 O 15 [24], which indicates that a pure phase of Sr 2 KTa 5 O 15 is obtained when KCl (F/P = 2) is used as flux at 1173 K for 3 h. The crystallite diameter was determined using the full width at half maximum (FWHM) of the (320) plane according to the Scherrer equation. The samples calcined at different temperatures showed similar crystallite diameters (Fig.…”

“…Sr 2 KTa 5 O 15 was fabricated by a KCl flux method with modification of the reported literature by Wark et al [24]. A stoichiometric mixture of K 2 CO 3 (99.5%, Wako), SrCO 3 (99.9%, Wako), and Ta 2 O 5 (99.9%, Kojundo) was ground with a specific amount of KCl (99.9%, Wako) in an Al 2 O 3 crucible for 5 min.…”

In‐situ Photosynthetic Route to Tailor Point Defects in TiO2(B) Nanosheets for Visible Light‐Driven Photocatalytic Hydrogen Production

“…), perovskite‐type oxides (SrTiO 3 , NaTaO 3 , etc. )− and tunnel‐type oxides (BaTi 4 O 9 and Sr 2 KNb 5 O 15 , etc) have been widely studied. Among them, the most commonly used semiconductor is TiO 2 polymorphs of anatase, rutile or brookite.…”

Synthesis of high-purity, layered structured K2Ta4O11 intermediate phase nanocrystals for photocatalytic water splitting

“…the photoreduction of water to hydrogen. [9][10][11] Amongst them, the extensively studied alkali-metal tantalates, i.e., ATaO 3 (A= Na, K) have been shown to exhibit remarkable photocatalytic hydrogen generation activity. ), 5,6 perovskite-type layered oxides (SrTiO 3 , K 4 Nb 6 O 17 , ATaO 3 (A= Na, K)), A 2 La 2 Ti 3 O 10 , (A= Na, K, Rb) 7,8 and tunnel-structured oxides (BaTi 4 O 9 , A 2 Ti 6 O 13 (A= Na, K, Rb), Sr 2 KTa 5 O 15 ).…”