Cd1-xZnxS supported on SBA-16 as photocatalysts for water splitting under visible light: Influence of Zn concentration
| Autor: | Y.J. Acosta-Silva, José Luis García Fierro, Saeed M. Al-Zahrani, R. Nava, Bárbara Pawelec, S.A. Macías-Sánchez, Rufino M. Navarro, V. Hernández-Morales |
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| Přispěvatelé: | Ministerio de Ciencia e Innovación (España), King Saud University, Universidad Autónoma de Querétaro |
| Rok vydání: | 2013 |
| Předmět: |
Cd1−xZnxS photocatalyst
Materials science Aqueous solution Renewable Energy Sustainability and the Environment Coprecipitation Inorganic chemistry Energy Engineering and Power Technology Condensed Matter Physics symbols.namesake Fuel Technology X-ray photoelectron spectroscopy Photocatalysis symbols Water photolysis Water splitting Raman spectroscopy High-resolution transmission electron microscopy SBA-16 substrate Hydrogen evolution Nuclear chemistry Solid solution |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 2010-2119 |
| Popis: | Cd1−xZnxS solid solutions (x = 0.05–0.3) supported on mesoporous silica SBA-16 substrate with 3D cubic structure were investigated for hydrogen production from water splitting under visible light. The influence of Zn concentration (x) in the Cd1−xZnxS solid solution and support morphology were investigated. The bare SBA-16 substrate was synthetized by the hydrothermal method whereas the Cd1−xZnxS photocatalysts were prepared by coprecipitation of metal sulfides from aqueous solutions of Cd2+ and Zn2+ using Na2S as precipitating agent. An attempt has been made to determine the photocatalyst structures using several techniques including elemental analysis, N2 adsorption–desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM), UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS) and Raman spectroscopy. Surface characterization of the samples by XPS indicates that Cd1−xZnxS nanoparticles are unevenly distributed on both external surface and within the pore network. An increase of the band gap energy with increasing Zn loading up to x = 0.2 in the Cd1−xZnxS solid solution was observed. As a consequence, H2 evolution increases gradually with an increase of the Zn loading in the photocatalysts from 0.05 to 0.2 wt% being the Cd0.8Zn0.2S/SBA-16 system the most active among the catalysts studied. The highest activity of this photocatalyst was explained in terms not only of its large band gap energy but also by the enhancement of the interaction between the particles of solid solution and the SBA-16 substrate. The authors express their gratitude to the following persons for the catalyst's characterization by different techniques: F. Rodríguez Melgarejo (CINVESTAV, QRO); C. Peza Ledesma (DIPFI-UAQ, CFATA-UNAM); and C.V. Loricera (ICP-CSIC, Spain). BP, RMN and JLGF thank their research sponsors MICINNM (Spain) under project ENE2010-21198-C04-01 and King Saud University, Riyadh (Saudi Arabia). Financial support by PROMEP (Project UAQ-PTC-190) and FOFI-UAQ-2012 is gratefully acknowledged. |
| Databáze: | OpenAIRE |
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