Photocatalytic properties of a novel layered photocatalyst CsLaSrNb2NiO9

Abstract

A new visible-light-driven photocatalyst CsLaSrNb 2 NiO 9 based on the 2-D layered perovskite crystal structure was prepared by using the solid-state method. Photocatalytic H 2 evolution from the aqueous CH 3 OH solution was achieved on the photocatalysts CsLaSrNb 2 NiO 9 under UV or visible light irradiation. A possible electronic band structure of CsLaSrNb 2 NiO 9 was proposed in regard to the complicated photocatalytic and photophysic properties.

Synthesis of new (Bi, La)3MSb2O11 phases (M = Cr, Mn, Fe) with KSbO3-type structure and their magnetic and photocatalytic properties

“…Figure 7 shows the diffuse-reflectance spectra (DRS) of the members. DRS reveals that (Bi, La) 3 MSb 2 O 11 compounds show broad absorption in the UV-Visible range similar to that found for BiVO 4 (Kudo et al 1999), BiCu 2 VO 6 (Liu et al 2005), Ag 2 CrO 4 (Ouyang et al 2008), CsLaSrNb 2 NiO 9 (Yao and Ye 2006) oxides, which are excellent photocatalysts. It is noteworthy that the onset of absorption edges (figure 7) is unclear because of several absorption overlaps in the visible range.…”

“…Absorption of photons with an energy equal to or greater than bandgap generates electronhole pairs. When oxides contain transition metals with partially filled d-orbitals, the electronic structure is strongly influenced by the transition metals (Wang et al 2003;Yao and Ye 2006). The visible light response of such compounds is attributed to the splitting of d-orbitals in octahedral field that creates new band levels in the bandgap (Wang et al 2003;Yin et al 2003).…”

NaNbO3 Nanostructures: Facile Synthesis, Characterization, and Their Photocatalytic Properties

“…Semiconductor photocatalysis is presently attracting tremendous attentions due to its potential applications in clean hydrogen energy generation and decomposition of organic pollutants [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Since photocatalytic hydrogen generation over TiO 2 electrode was reported [15], a variety of Ti-, Nb-, Ta-, and W-based photocatalysts have been reported to exhibit activities for water splitting and decomposition of organic pollutants.…”

Photocatalytic water splitting on protonated form of layered perovskites K0.5La0.5Bi2M2O9 (M = Ta; Nb) by ion-exchange

“…In the initial stage under the light irradiation, the ratio H 2 /O 2 was apparent larger than stoichiometric ratio. It should be ascribed to O 2 adsorption on the surface of HKLBT [8,25] . With the photocatalytic proceeding, the amount of O 2 increased and the ration of H 2 /O 2 decreased to reach about 2.9, which was also lager than stoichiometric amount.…”

“…In the meantime, it is necessary to load co-catalyst (e.g. Pt) on surface of photocatalysts [8,9] for inhibiting strong recombination of carriers. Therefore, the development of novel photocatalysts with high photocatalytic efficiency for overall water splitting is still a challenging target in this field.…”