Photophysical and photocatalytic properties of Bi2MNbO7 (M=Al, In, Ga, Fe) thin films prepared by dip-coating

Photoelectrochemical Hydrogen Production from Aqueous Solution Containing Cyanide Using Bi2MNbO7 (M = Al, Fe, Ga, In) Films on Stainless Steel as Photoanodes

“…Note that at the beginning of the process (t = 0) the current density obtained with 304 SS is higher than those obtained with the semiconductor films on 304 SS because the deposited material gives an electrical resistance to the electrical flux. This resistance is lower for Bi 2 MNBO 7 films than TiO 2 film indicating that the former semiconductor family has a lower band-gap than TiO 2 , as is shown in previous reports [56][57][58][59]. After 25 min, this barrier is overcome by the generation of photoelectrons and their subsequent transfer to the cathode (photogenerated current), resulting in increased current density and therefore an enhanced hydrogen production [71,72].…”

“…At the same electrolyte conditions and 1 h of the photoelectrochemical process the photoanodes exhibited the following performance: Bi 2 AlNbO 7 /304 SS ) Bi 2 InNbO 7 / 304 SS & Bi 2 FeNbO 7 /304 SS [ Bi 2 GaNbO 7 /304 SS & TiO 2 /304 SS [ 304 SS. These results can not be straightforward correlated with their band-gap values, degree of crystallinity or stoichiometric ratios as in the previous reports on photocatalytic degradation [59,60]. Electrical and photoelectrical transport properties seem to play a preponderant role on these photoelectrochemical systems [54,61].…”

“…Briefly, an alcoholic suspension was made by mixing stoichiometric amounts of the corresponding metal precursors (the reagents mentioned above), in the presence of a complexing agent (acetylacetone). Details of the preparation have been described elsewhere [59]. Subsequently, by hydrolysis and polycondensation reactions, a stable sol was formed and used for the preparation of films on metallic substrates (15 9 25 mm), which were degreased by sonication in ethanol (15 min) and rinsed with distilled water.…”

“…This new series of promising photocatalysts for water decomposition with visible light was first synthesized as powders, by a solidstate reaction [53][54][55][56][57] and a sol-gel process [58], and recently as thin films, by sol-gel dip-coating [59][60][61].…”

Synthesis of Bi–Fe–Sb–O Pyrochlore Nanoparticles with Visible‐Light Photocatalytic Activity

“…[1] The high photoactivities of oxides with the pyrochlore structure have been reported previously. [2][3][4][5][6] Photocatalytic water decomposition was observed in the presence the Bi-containing compounds Bi 2 MTaO 7 (M = In, Ga, Fe, Y, La) [2,3] and Bi 2 MNbO 7 [M = Al, Ga, In, Y, rare-earth element (REE)]; [4,5] in turn, Bi 2 MNbO 7 (M = Al, Ga, In, Fe) [6,7] and Bi 2 MTaO 7 (M = Y, La) [3] can be used for the photodecomposition of organic dyes. The photoactivities of the Bi 2 MSbO 7 compounds have not been studied previously, although Y 2 FeSbO 7 and In 2 FeSbO 7 can be used as photocatalysts for rhodamine B degradation.…”