Preparation and Photocatalytic Properties of Sr2−xBaxTa3O10−yNz Nanosheets

Abstract

Sr 2−x Ba x Ta 3 O 10−y N z (x = 0.0, 0.5, 1.0) nanosheets were prepared by exfoliating layered perovskite compounds (CsSr 2−x Ba x Ta 3 O 10−y N z ). The Sr 1.5 Ba 0.5 Ta 3 O 9.7 N 0.2 nanosheet showed the highest photocatalytic activity for H 2 production from the water/methanol system among the Sr 2−x Ba x Ta 3 O 9.7 N 0.2 nanosheets prepared. In addition, Rh-loaded Sr 1.5 Ba 0.5 Ta 3 O 9.6 N 0.3 nanosheet showed the photocatalytic activity for oxygen and hydrogen production from water. The ratio of hydrogen to oxygen evolved was around two. These results indicate that the Rh-loaded Sr 1.5 Ba 0.5 Ta 3 O 9.6 N 0.3 nanosheet is a potential catalyst for photocatalytic water splitting.

Two‐Dimensional Metal Oxide and Metal Hydroxide Nanosheets: Synthesis, Controlled Assembly and Applications in Energy Conversion and Storage

“…[75] The position of the absorption edge of in HCa 2 Nb 3-y Ta y O 10 results in a blue shift of the absorption edge. [44,80] Figure 17 clearly demonstrates the much higher activity of the nanosheets compared to its protonated form and the original parent compound. Their performance actually decreased with increasing Sr content, presumably owing to a decrease of the driving force of conduction band electrons for proton reduction.…”

“…Metastable Sr 0.5 TaO 3 nanosheets synthesized from layered H 2 Sr 1.5 Ta 3 O 10 host material gave hydrogen (126 μmol h –1 ) and oxygen (33 μmol h –1 ) gas evolution in distilled water . Novel tantalum oxynitride nanosheets [Ca 2 Ta 3 O 9.7 N 0.2 ] and [Sr 2− x Ba x Ta 3 O 9.7 N 0.2 ] of 2.8–3.1 nm thickness, prepared by exfoliating Cs(Ca,Sr,Ba) 2 Ta 3 O 9.7 N 0.2 via proton exchange and two‐step intercalation of ethylamine and tetrabutylammonium ions, showed oxygen and hydrogen evolution (H 2 /O 2 = 3) from pure water when loaded with a Rh co‐catalyst . Figure 17 clearly demonstrates the much higher activity of the nanosheets compared to its protonated form and the original parent compound.…”

Recent Progress of Perovskite Oxide in Emerging Photocatalysis Landscape: Water Splitting, CO₂ Reduction, and N₂ Fixation

“…1 8d) 116 . Apart from that, nitrogen is a promising dopant as well, which is demonstrated by N-doped CsCa2Ta3O10 nanosheets with a remarkable photocatalytic activity of 1660 μmol•g −1 •h −1 254 and N doped Sr1.5Ba0.5Ta3O10 nanosheets, which achieved the promising efficiency of 1303 μmol•g −1 •h −1 unexpectedly 255 . Heterogeneous composite construction has also become one of the hottest research horizons as their presence aids in the formation of a built-in electric field, thus leading to enhanced charge separation.…”

Synthesis and Characterization of K2Ln2/3Ta2O7·nH2O (Ln= La, Pr, Nd), Layered Tantalates Photocatalysts for Water Splitting.

“…Tantalum-oxide based compounds crystallizing in the Ruddlesden-Popper (RP) structure [1] have recently attracted much attention due to their ion-exchange [2]- [5] (96 and intercalation [6]- [8] properties and as photocatalysts for hydrogen generation from water splitting [9]- [11]. Additionally, high proton conductivity has been recently reported [12] in randomly oriented grains of H 2 SrTa 2 O 7 and SrTa 2 O 6 .…”