Polarization-enhanced photoelectrochemical properties of BaTiO₃/BaTiO_3−x/CdS heterostructure nanocubes

Abstract

With the aim of promoting the photocatalytic activity for water splitting, a novel core-shell-structured crystalline-BaTiO3/amorphous-BaTiO3-x/crystalline-CdS composite nanocubes are prepared by a two-step facile synthesis approach. The basic characterization techniques such...

Fabrication and enhanced photoelectric properties of a novel Bi9O7.5S6/CdS composite film

“…1b, it can be found that a dense CdS film was coated on the ITO substrate using the CBD technique followed by annealing treatments, revealing the excellent film-forming ability of CdS as also extensively reported before. [28][29][30] For both Bi 9 O 7.5 S 6 /ITO and Bi 9 O 7.5 S 6 /CdS/ ITO films, the Bi 9 O 7.5 S 6 layer consists of aggregated small particles, which seem to be somewhat incompact but still strongly adhesive as shown in Fig. 1c and d.…”

“…By forming the heterojunction structure, the CdS-based composites can suppress the oxidation of surface lattice sulfur, leading to superior photostability. 28,57,58 Additionally, the photocorrosion of CdS usually occurs in a moist environment. Thus, a dense Bi 9 O 7.5 S 6 layer covering the surface of the CdS layer can effectively prevent CdS contacting moisture.…”

Selectively constructing sandwich-like heterostructure of CdS/PbTiO3/TiO2 to improve visible-light photocatalytic H2 evolution

“…In this study, we upgraded the system by introducing a typical visiblelight-responsive photocatalyst CdS with a bandgap of 2.4 eV [23,24] to extend the light absorption capability of PbTiO 3 /TiO 2 . Controlling the spatial distribution of the components and their interfaces is necessary for the construction of efficient photocatalysts in heterostructures, particularly three-component ones [25][26][27][28][29][30][31]. Ren's group [32] and Liu's group [33] previously demonstrated the effectiveness of CdS in photocatalytic or piezophotocatalytic applications using single-crystal PbTiO 3 rods or nanoplates modified with CdS nanoparticles.…”

A significant enhancement of bulk charge separation in photoelectrocatalysis by ferroelectric polarization induced in CdS/BaTiO3 nanowires

“…[12][13][14][15][16][17] And The effect of polarized surface was accounted for a band-bending model. Ferroelectric semiconductors, such as BaTiO 3 (BTO), 18,19 were taken seriously due to their ability to generate an internal electric eld to enhance charge separation in the bulk. 20 When an external electric eld is applied to the material in a certain direction, the original chaotic ferroelectric domains in the bulk will be oriented to a certain degree, which causes the two surfaces of the bulk along the direction of the external electric eld to be enriched with opposite bound charges.…”

“…A recent report by Zhu et al presented an improved PEC property of the BaTiO 3 /BaTiO 3Àx /CdS composite nanocubes due to the extended visible-light absorbance and polarization modulation. 18 However, it has not quantitatively veried the effect of ferroelectric polarization on the bulk charge separation. This information is not only instructive for understanding the role of ferroelectric polarization in BTO, but also important for the reasonable design and optimization of BTO-based electrode system to obtain efficient PEC performance.…”