RTU Research Information System
Latviešu English

Publikācija: Aqueous Synthesis of Z-Scheme Photocatalyst Powders and Thin-Film Photoanodes from Earth Abundant Elements

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Other research projects
Defending: ,
Publication language English (en)
Title in original language Aqueous Synthesis of Z-Scheme Photocatalyst Powders and Thin-Film Photoanodes from Earth Abundant Elements
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Authors Andris Šutka
Mārtiņš Vanags
Urmas Joost
Krišjānis Šmits
Jurģis Ruža
Jānis Ločs
Jānis Kleperis
Tālis Juhna
Keywords Hematite, Photoanode, Photocatalyst, Photoelectrochemical properties, Z-scheme
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.
DOI: 10.1016/j.jece.2018.04.003
Hyperlink: https://www.sciencedirect.com/science/article/pii/S2213343718301805?via%3Dihub 
Reference Šutka, A., Vanags, M., Joost, U., Šmits, K., Ruža, J., Ločs, J., Kleperis, J., Juhna, T. Aqueous Synthesis of Z-Scheme Photocatalyst Powders and Thin-Film Photoanodes from Earth Abundant Elements. Journal of Environmental Chemical Engineering, 2018, Vol.6, Iss.2, pp.2606-2615. ISSN 2213-3437. Available from: doi:10.1016/j.jece.2018.04.003
Additional information Citation count:
ID 28183