Abstract
In this work, Sr1−1.5xTbxWO4 (0 ≤ x ≤ 0.2) solid solutions were synthesized via a traditional high-temperature solid state method. Le Bail fitting on the powder X-ray diffraction (XRD) pattern showed that these solid solutions are pure phase. Scanning electron microscopy showed that the SrWO4 and Sr0.82Tb0.12WO4 samples are composed of micrometer particles and submicron crystallites, respectively. Ultraviolet–visible diffuse reflectance spectra suggested that the bandgaps of Sr1−1.5xTbxWO4 are narrower than the undoped sample. The Sr0.82Tb0.12WO4 sample, with the assistance of 1.5 wt % Ru-cocatalyst, exhibits the best performance for H2 evolution in 5 vol % aqueous triethanolamine (TEOA), which results in about 6.1 and 2.8 times efficiency improvement compared with the intrinsic SrWO4 in methanol and aqueous TEOA, respectively. All the photocatalysts recycled after the photocatalytic reactions showed no degradation when checked by powder XRD.
Highlights
Photocatalytic technology is a green way to obtain clean energy hydrogen via semiconductor from water under sunlight irradiation [1]
Le Bail fitting on powder X-ray diffraction (XRD) verified high purity and crystallinity of the as-prepared samples, and the fitting on powder XRD verified high purity and crystallinity of the as-prepared samples, and the Scanning electron microscopy (SEM) images showed that the SrWO4 and Sr0.82 La0.12 WO4 were composed of micron and submicron
2p orbitals, and the conduction band minimum was composed of both band maximum was composed of O 2p orbitals, and the conduction band minimum was composed
Summary
Photocatalytic technology is a green way to obtain clean energy hydrogen via semiconductor from water under sunlight irradiation [1]. The sulfide and oxynitride materials generally have excellent photocatalytic activities, both of them are not stable enough in aqueous solution under light irradiation. Suitable SrWO4 crystal structures are able to degrade various dyes and organic materials under ultraviolet light [15,16,17,18,19,20,21]. Materials 2019, 12, 1487 single report of H2 evolution by SrWO4 micro/nanostructures in aqueous methanol under ultraviolet light irradiation [22]. The photocatalytic H2 evolution of scheelite structure SrWO4 was improved by doping rare earth ions and cocatalysts. The Sr1−1.5x Tbx WO4 solid solutions were studied for the first time in aqueous TEOA under ultraviolet light irradiation, and their photocatalytic activity was improved by loading various cocatalysts, such as Cu, Ag, Au, Pt, Ni, and Ru
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
