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Agileo Hernández-Gordillo Francisco TzompantziRicardo Gómez 《International Journal of Hydrogen Energy》2012
Highly active ZnS-UV was obtained in situ from ZnS(en)0.5 hybrid during the hydrogen formation using a methanol–water solution under UV irradiation. X-ray diffraction patterns and UV spectroscopy for both ZnS-UV and ZnS-400 obtained from the calcination of the ZnS(en)0.5 hybrid showed similar structural and photophysical properties; however, the efficiency of the ZnS-UV semiconductor was 7 times higher (4825 μmol h−1 g−1) compared to the ZnS-400. The highest H2 production was obtained using a UV lamp of very low intensity (2.2 mW cm−1) and it is attributed to a quantum size effect caused by the slow elimination of ethylenediamine (en) in the structural ZnS layer during the UV irradiation. 相似文献
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Karen Valencia G. Alejandro López Agileo Hernández-Gordillo Rodolfo Zanella Sandra E. Rodil 《Ceramics International》2018,44(18):22329-22338
Stabilized tetragonal Bi2O3 nanoparticles (β-Bi2O3) were obtained by annealing treatments of amorphous Bi-based precursors, obtained by chemical precipitations, at temperatures between 350 and 450?°C. The formation of the stabilized β-Bi2O3 phase was possible by using (BiO)4CO3(OH)2 while other precursors such as amorphous bismuth carbonate ((BiO)2CO3) and amorphous basic bismuth nitrate (Bi6O6(OH)2(NO3)4·2H2O) led to the formation of the thermodynamically stable monoclinic α-Bi2O3 and Bi5O7NO3 phases. The Bi-based precursors were prepared by the chemical precipitation method at room temperature in ethylenediamine-solvent varying the HNO3/Bi3+ molar ratio (10, 26 and 56). The physicochemical properties of the three as-prepared amorphous precursors and the formed-after-calcination β-Bi2O3, α-Bi2O3 and Bi5O7NO3 phases were analyzed by X-ray diffraction, scanning electron microscopy, thermogravimetry, X-ray photoelectron spectroscopy (XPS), FTIR analysis, diffuse reflectance spectroscopy and surface area by BET method. The photocatalytic activity of all annealed solids containing the β-Bi2O3 phase was tested in the photodegradation of the indigo carmine (IC) dye under specific blue light. A schematic diagram of the Bi2O3 phases obtained as a function of the annealing conditions and initial amorphous precursor is proposed and explained in terms of the amount of CO32-, NO3- and amine (ENH22+ ? ENH+) ions present in each bismuth precursor. 相似文献
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Próspero Acevedo Peña David Ramírez Ortega Diana Guerrero Araque Agileo Hernández Gordillo Rodolfo Zanella Edilso Reguera 《International Journal of Hydrogen Energy》2021,46(17):10312-10323
The development of cheap and efficient co-catalysts is crucial to improve the performance of well-known photocatalysts towards the hydrogen evolution reaction. Here, copper hexacyanocobaltate was evaluated for the first time as a potential candidate to be used as co-catalyst coupled with conventional TiO2. Copper hexacyanocobaltate was formed by chemical precipitation in the presence of TiO2, without needing further treatments. The composite exhibited paramount performance towards hydrogen generation, surpassing by up to 16 times the behavior reached with bare TiO2. This composite also overcome the performance of conventional TiO2 modified with copper and cobalt oxides derived from copper hexacyanocobaltate. The enhanced behavior of TiO2/Cu3[Co(CN)6]2 composite was promoted by the efficient separation of photogenerated charge carries, and the faster charge transfer from photocatalyst towards species in solution, as it was proved by the photoelectrochemical characterization of the materials. Furthermore, the composite experienced a slight detriment (15%) in its hydrogen production rate after four consecutive photocatalyst tests. This variation was attributed to the slow leaching of copper in the co-catalyst caused by its partial transformation into metal hydroxides, as it was suggested by the ex-situ XPS characterization. Nevertheless, the structural characterization evinced the presence of the Cu3[Co(CN)6]2 in the composite after long-term use. This study should be considered a proof of concept on a reliable route to obtain appropriate composites for hydrogen production using light as primary energy source. 相似文献
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Suitable preparation of Bi2S3 nanorods –TiO2 heterojunction semiconductors with improved photocatalytic hydrogen production from water/methanol decomposition
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Karen Valencia G. Hernández-Gordillo Agileo Oros-Ruiz Socorro Rodil Sandra E. 《Topics in Catalysis》2021,64(1-2):121-130
Topics in Catalysis - Alpha phase bismuth oxide (α-Bi2O3) microparticles were prepared through the annealing at 600 °C of basic bismuth nitrate [Bi6O6(OH)2(NO3)4·2H2O]... 相似文献
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Comparative activity of CdS nanofibers superficially modified by Au,Cu, and Ni nanoparticles as co‐catalysts for photocatalytic hydrogen production under visible light
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