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Highly efficient hydrogen generation of BiI3 nanoplates decorated with Ag nanoparticles.

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Title: Highly efficient hydrogen generation of BiI3 nanoplates decorated with Ag nanoparticles.
Authors: Diaz-Torres, L.A.1 ditlacio@cio.mx, Gomez-Solis, C.1,2, Oliva, J.3, Coutino-Gonzalez, E.4
Source: International Journal of Hydrogen Energy. Aug2018, Vol. 43 Issue 33, p15962-15974. 13p.
Subjects: Hydrogen production, Silver nanoparticles, Photocatalysts, Hydrogen evolution reactions, Carbon films
Abstract: This work presents the photocatalytic hydrogen generation of BiI 3 films when they are exposed under simulated solar irradiation. Those films were fabricated by a simple bath chemical deposition method. The images of Scanning electron microscopy show that the BiI 3 films are formed by polycrystalline particles with hexagonal shape and a closer inspection shows that nanoplates grown into them. The performance for the hydrogen generation of BiI 3 films synthesized with different times (from 1 to 3 h), BiI 3 films decorated with silver nanoparticles (BiI 3 -Ag) and BiI 3 powders were compared. We found that the presence of Ag nanoparticles in the BiI 3 films increased the hydrogen generation from 9 mmol/g·h to 14 mmol/g·h because these nanoparticles improved electron conductivity, reduced the amount of defects in the BiI 3 films, raised the optical absorption, and produced higher photocurrents (with respect to the BiI 3 films without nanoparticles) as confirmed by electrochemical experiments. On the contrast, the BiI 3 powders had a poor hydrogen generation rate of only 0.5 mmol/g·h, this was due to the fact that they are formed by nanoplates 10 times bigger than these ones grown on the BiI 3 films, consequently, they had lower surface area than the nanoplates in the BiI 3 films. A possible mechanism for the hydrogen generation by the BiI 3 and BiI 3 -Ag films is also discussed. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This work presents the photocatalytic hydrogen generation of BiI 3 films when they are exposed under simulated solar irradiation. Those films were fabricated by a simple bath chemical deposition method. The images of Scanning electron microscopy show that the BiI 3 films are formed by polycrystalline particles with hexagonal shape and a closer inspection shows that nanoplates grown into them. The performance for the hydrogen generation of BiI 3 films synthesized with different times (from 1 to 3 h), BiI 3 films decorated with silver nanoparticles (BiI 3 -Ag) and BiI 3 powders were compared. We found that the presence of Ag nanoparticles in the BiI 3 films increased the hydrogen generation from 9 mmol/g·h to 14 mmol/g·h because these nanoparticles improved electron conductivity, reduced the amount of defects in the BiI 3 films, raised the optical absorption, and produced higher photocurrents (with respect to the BiI 3 films without nanoparticles) as confirmed by electrochemical experiments. On the contrast, the BiI 3 powders had a poor hydrogen generation rate of only 0.5 mmol/g·h, this was due to the fact that they are formed by nanoplates 10 times bigger than these ones grown on the BiI 3 films, consequently, they had lower surface area than the nanoplates in the BiI 3 films. A possible mechanism for the hydrogen generation by the BiI 3 and BiI 3 -Ag films is also discussed. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2018.06.182