Simple synthesis method of Bi2S3/CdS quantum dots cosensitized TiO2 nanotubes array with enhanced photoelectrochemical and photocatalytic activity

A novel Bi 2 S 3 nanowire @ TiO 2 nanorod heterogeneous nanostructure for photoelectrochemical hydrogen generation

“…This makes it popular in PEC and photovoltaic applications [37,41,42]. In addition, Bi 2 S 3 has a more negative conductor band (CB) edge than that of TiO 2 and the photogenerated electrons in Bi 2 S 3 can inject in TiO 2 easily (Fig.…”

“…However, TiO 2 is a wide bandgap semiconductor (E g % 3.2 eV) and can only absorb and utilize the ultraviolet region of the solar spectrum [26,27]. To enhance light harvesting in the visible 400-800 nm region, various attempts were employed including doping TiO 2 with other impurities [28][29][30] and coupling it with narrow bandgap semiconductors such as CdS [31,32], CdSe [33,34], PbS [35,36] and Bi 2 S 3 [37,38]. Among narrow bandgap semiconductors, Bi 2 S 3 is an n-type semiconductor with a direct bandgap of 1.3 eV.…”

Photovoltaic Properties of Bi2S3 and CdS Quantum Dot Sensitized TiO2 Solar Cells

“…The QDs can be made of different materials, such as: CdSe, CdTe, CdS, PbS, PbSe, Bi 2 S 3 , and InP [4][5][6][7][8][9][10][11][12][13][14][15][16]. These Nanoparticles (NPs) can be easily prepared from solution methods at a low cost.…”

“…Bismuth sulfide (Bi 2 S 3 ) is one alternative that has attracted significant interest as a potential replacement for PbS in QDSSCs, as well as for photocatalytic applications [15,[38][39][40][41][42][43][44]. Bi 2 S 3 is an abundant material with low toxicity [45], narrow band gap (1.3 eV), and large absorption coefficient [15]. Panchromatic absorption of Bi 2 S 3 QDs based solar cells by tuning the size of the NPs to control their band gap and conduction band has been demonstrated [39].…”

Improving the visible light photocatalytic activity of TiO2 nanotubes upon decoration with Sb2S3 microcrystalline

“…Comparing with TiO 2 nanopowders, TiO 2 nanotubular structure has a larger surface area, better adsorption capacity and higher photocatalytic activity [5]. Recently, particular attention has been paid on the self-organized TiO 2 nanotube arrays (TiO 2 NTs) fabricated by anodization because of the high orientation and excellent electron pathways for vertical charge transfer, which is in favor of the improvement of photocatalytic efficiency [6][7][8]. However, the large band gap of TiO 2 limits its photoactivity in the UV region of the solar spectrum.…”