A Sillén oxyhalide SrBi₃O₄Cl₃ as a promising photocatalyst for water splitting: impact of the asymmetric structure on light absorption and charge carrier dynamics

Abstract

Bismuth-based oxyhalides with layered Sillén(−Aurivillius) structures have attracted significant attention as photocatalysts. Recent studies have unveiled a part of the structure-property relationship of this material; however, it has not been...

Band engineering of layered oxyhalide photocatalysts for visible-light water splitting

“…In the Sr counterpart (SrBi 3 O 4 Cl 3 ), the asymmetry around the fluorite [Sr 0.5 Bi 1.5 O 2 ] layer leads to the preferential occupation of Bi at the site adjacent to the chloride monolayer. 107 This is in contrast to the equally distributed Sr and Bi in the fluorite layer of SrBiO 2 Cl, which comprises only a halogen monolayer. The narrower bandgap of SrBi 3 O 4 Cl results from a higher VBM and lower CBM compared with those of BiOCl and SrBiO 2 Cl ( Fig.…”

“…12a). 107,108 For M = Pb, PbBi 3 O 4 Br 3 exhibits a slightly smaller bandgap compared to PbBi 3 O 4 Cl 3 , which is ascribed to the contribution of electrostatically destabilized Br bilayers surpassing that of O 2p. Another important effect of combining these two types of halogen layers is the asymmetry of the fluorite layer along the out-of-plane direction introduced by sandwiching with the single and double halogen layers.…”

Nanostructured (oxy)nitrides controllably synthesized by flux-assisted nitridation for promoted photocatalytic water splitting

“…10–15 Therefore, a series of narrow bandgap semiconductors, such as doped oxides, (oxy)nitrides, (oxy)sulfides, and halonitrides, have been explored. 16–25 Among them, the (oxy)nitrides have drawn more attention due to the features of excellent electronic and optical properties and outstanding energy band structures. 11,26 Currently, how to prepare (oxy)nitrides with enhanced charge utilization is the mainstream in this field.…”

Double-Layered Sillen–Aurivillius Perovskite Oxybromide Sr2Bi3Nb2O11Br as a Fatigue-Free Piezocatalyst with Ultrahigh Hydrogen Evolution Performance

“…Catalytic water splitting has become increasingly attractive for sustainable energy generation, offering an alternative to fossil fuels, while mitigating challenges from carbon dioxide emissions. This process involves harnessing various renewable energy sources, such as solar light, waste heat, and mechanical vibrations, etc., to produce high-energy-density hydrogen (H 2 ). − Among emerging technologies, piezocatalytic water splitting, i.e., converting waste mechanical energy, such as ultrasound noise, into chemical energy, stands out for its potential to improve H 2 production. This approach leverages piezoelectric materials that can develop surface charges when subjected to external pressure.…”