dc.contributor.author | Šutka, Andris | |
dc.contributor.author | Vanags, Martins | |
dc.contributor.author | Joost, Urmas | |
dc.contributor.author | Smits, Krisjanis | |
dc.contributor.author | Ruža, Jurģis | |
dc.contributor.author | Locs, Janis | |
dc.contributor.author | Kleperis, Janis | |
dc.contributor.author | Juhna, Talis | |
dc.date.accessioned | 2020-10-01T13:21:24Z | |
dc.date.available | 2020-10-01T13:21:24Z | |
dc.date.issued | 2018 | |
dc.identifier.issn | 2213-3437 | |
dc.identifier.uri | https://dspace.lu.lv/dspace/handle/7/52552 | |
dc.description | Riga Technical University supported the preparation of this manuscript from the Scientific Research Project Competition for Young Researchers No. ZP 2017/8 | en_US |
dc.description.abstract | Solid-state narrow band gap semiconductor heterostructures with a Z-scheme charge-transfer mechanism are the most promising photocatalytic systems for water splitting and environmental remediation under visible light. Herein, we construct all-solid Z-scheme photocatalytic systems from earth abundant elements (Ca and Fe) using an aqueous synthesis procedure. A novel Z-scheme two-component Fe2O3/Ca2Fe2O5 heterostructure is obtained in a straightforward manner by soaking various iron-containing nanoparticles (amorphous and crystalline) with Ca(NO3)2 and performing short (20min) thermal treatments at 820°C. The obtained powder materials show high photocatalytic performances for methylene blue dye degradation under visible light (45 mW/cm2), exhibiting a rate constant up to 0.015min-1. The heterostructure exhibits a five-fold higher activity compared to that of pristine hematite. The experiments show that amorphous iron-containing substrate nanoparticles trigger the Fe2O3/Ca2Fe2O5 heterostructure formation. We extended our study to produce Fe2O3/Ca2Fe2O5 nanoheterostructure photoanodes via the electrochemical deposition of amorphous iron-containing sediment were used. The visible-light (15mW/cm2) photocurrent increases from 183μA/cm2 to 306μA/cm2 after coupling hematite and Ca2Fe2O5. Notably, the powders and photoanodes exhibit distinct charge-transfer mechanisms evidenced by the different stabilities of the heterostructures under different working conditions. | en_US |
dc.description.sponsorship | Riga Technical University No. ZP 2017/8; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART² | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier Ltd | en_US |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/739508/EU/Centre of Advanced Material Research and Technology Transfer/CAMART² | en_US |
dc.relation.ispartofseries | Journal of Environmental Chemical Engineering;6 (2) | |
dc.rights | info:eu-repo/semantics/openAccess | en_US |
dc.subject | Research Subject Categories::NATURAL SCIENCES:Physics | en_US |
dc.subject | Hematite | en_US |
dc.subject | Photoanode | en_US |
dc.subject | Photocatalyst | en_US |
dc.subject | Photoelectrochemical properties | en_US |
dc.subject | Z-scheme | en_US |
dc.title | Aqueous synthesis of Z-scheme photocatalyst powders and thin-film photoanodes from earth abundant elements | en_US |
dc.type | info:eu-repo/semantics/article | en_US |
dc.identifier.doi | 10.1016/j.jece.2018.04.003 | |