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Título: | Beyond Mono-, Di-, and Trisulfides: Synthesizing vanadium tetrasulfide (VS4) films for energy conversion |
Autor: | Flores, Eduardo CSIC ORCID; Muñoz-Cortés, Esmeralda; Bodega, Julio; Caballero-Calero, Olga CSIC ORCID; Martín-González, Marisol CSIC ORCID ; Sánchez, Carlos; Ares, José R.; Ferrer, Isabel J. | Palabras clave: | Hydrogen photogeneration Low-dimensional chalcogenides Metal sulfides Patronite Solar energy conversion VS4 |
Fecha de publicación: | 29-may-2018 | Editor: | American Chemical Society | Citación: | ACS Applied Energy Materials 1(5): 2333-2340 (2018) | Resumen: | Vanadium tetrasulfide (VS4, called patronite as a mineral) is a one-dimensional compound with promising properties for energy conversion applications. However, it has been scarcely investigated because of its complex synthesis. In this work, we report a detailed investigation about the formation mechanism of VS4 (V4+(S22–)2) as well as its structural, transport, and photoelectrochemical properties. To this aim, VS4 films were grown by a solid–gas reaction process between vanadium films and sulfur at temperatures between 350 and 450 °C during different reaction times. Film characterization (X-ray diffraction, energy-dispersive analysis of X-ray, micro-Raman spectroscopy, and scanning electron microscopy) reveals the formation of monoclinic VS4 nanorods (I2/C) as single crystalline phase in very short reaction times (t < 5 h). Optical characterization was carried out by reflectance and transmittance measurements to obtain the optical absorption coefficient (α = 104 cm–1 at photon energies higher than 1.6 eV). From these measurements, a direct optical band gap of 1.35 ± 0.05 eV is obtained. Additionally, VS4 films were used as photoanodes of a photoelectrochemical cell (PEC) with a platinum foil as counter electrode and a Ag/AgCl reference electrode to characterize the VS4/electrolyte (aqueous 0.5 M Na2SO3) interface. Finally, the evolved hydrogen under 200 mW/cm2 white light illumination over the VS4/interface at 0.3 V (Ag/AgCl) bias potential was quantified by a quadrupole mass spectrometer (QMS) reaching fluxes of ∼20 μmol/h. | Versión del editor: | http://dx.doi.org/10.1021/acsaem.8b00449 | URI: | http://hdl.handle.net/10261/181007 | DOI: | 10.1021/acsaem.8b00449 | ISSN: | 2574-0962 |
Aparece en las colecciones: | (IMN-CNM) Artículos |
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