Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting

Solar photo(electro)chemical (PEC) water splitting is regarded as a promising ways of renewable hydrogen production. Especially, type 2 PEC systems, in which the necessary energy needed to split water can be supplied by two complimentary photoabsorbers, have the potential to economically compete wit...

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Main Author: Hermans, Yannick
Format: Others
Language:en
Published: 2019
Online Access:http://tuprints.ulb.tu-darmstadt.de/8700/1/Complete_thesis%20-%20German.pdf
Hermans, Yannick <http://tuprints.ulb.tu-darmstadt.de/view/person/Hermans=3AYannick=3A=3A.html> : Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting. Technische Universität, Darmstadt [Ph.D. Thesis], (2019)
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spelling ndltd-tu-darmstadt.de-oai-tuprints.ulb.tu-darmstadt.de-87002019-06-15T03:34:31Z http://tuprints.ulb.tu-darmstadt.de/8700/ Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting Hermans, Yannick Solar photo(electro)chemical (PEC) water splitting is regarded as a promising ways of renewable hydrogen production. Especially, type 2 PEC systems, in which the necessary energy needed to split water can be supplied by two complimentary photoabsorbers, have the potential to economically compete with steam methane reforming, the conventional hydrogen production method. In this work, BiVO4 and CuFeO2 were chosen to perform the water oxidation and water reduction reaction, respectively. However, according to literature additional contact materials are required to achieve a reasonable water splitting performance. The exact benefits of these contact materials have not yet been completely elucidated. Therefore, we opted in this work to investigate the junction properties of certain BiVO4 and CuFeO2 based heterostructures through so called interface experiments, whereby a certain contact material was stepwise sputtered onto a BiVO4 or CuFeO2 substrate, performing photoelectron spectroscopy measurements in between each deposition step. In this way we could interpret the band alignment between the substrate and the contact material, as well as determine the Fermi level tunability for the studied photoabsorbers. In parallel, new anisotropic CuFeO2 and BiVO4 based heterostructured powders were created through photodeposition. In particular, silver, platinum, cobalt(oxy)(hydr)oxide and nickel(oxy)(hydr)oxide were successfully deposited onto anisotropically shaped BiVO4 and CuFeO2 powders. These powders were tested as well for their performance in photochemical water splitting. 2019-05-16 Ph.D. Thesis NonPeerReviewed text CC-BY-NC-ND 4.0 International - Creative Commons, Attribution Non-commerical, No-derivatives http://tuprints.ulb.tu-darmstadt.de/8700/1/Complete_thesis%20-%20German.pdf Hermans, Yannick <http://tuprints.ulb.tu-darmstadt.de/view/person/Hermans=3AYannick=3A=3A.html> : Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting. Technische Universität, Darmstadt [Ph.D. Thesis], (2019) en info:eu-repo/semantics/doctoralThesis info:eu-repo/grantAgreement/EC/H2020/641640 info:eu-repo/semantics/openAccess
collection NDLTD
language en
format Others
sources NDLTD
description Solar photo(electro)chemical (PEC) water splitting is regarded as a promising ways of renewable hydrogen production. Especially, type 2 PEC systems, in which the necessary energy needed to split water can be supplied by two complimentary photoabsorbers, have the potential to economically compete with steam methane reforming, the conventional hydrogen production method. In this work, BiVO4 and CuFeO2 were chosen to perform the water oxidation and water reduction reaction, respectively. However, according to literature additional contact materials are required to achieve a reasonable water splitting performance. The exact benefits of these contact materials have not yet been completely elucidated. Therefore, we opted in this work to investigate the junction properties of certain BiVO4 and CuFeO2 based heterostructures through so called interface experiments, whereby a certain contact material was stepwise sputtered onto a BiVO4 or CuFeO2 substrate, performing photoelectron spectroscopy measurements in between each deposition step. In this way we could interpret the band alignment between the substrate and the contact material, as well as determine the Fermi level tunability for the studied photoabsorbers. In parallel, new anisotropic CuFeO2 and BiVO4 based heterostructured powders were created through photodeposition. In particular, silver, platinum, cobalt(oxy)(hydr)oxide and nickel(oxy)(hydr)oxide were successfully deposited onto anisotropically shaped BiVO4 and CuFeO2 powders. These powders were tested as well for their performance in photochemical water splitting.
author Hermans, Yannick
spellingShingle Hermans, Yannick
Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting
author_facet Hermans, Yannick
author_sort Hermans, Yannick
title Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting
title_short Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting
title_full Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting
title_fullStr Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting
title_full_unstemmed Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting
title_sort interface analysis and development of bivo4 and cufeo2 heterostructures for photochemical water splitting
publishDate 2019
url http://tuprints.ulb.tu-darmstadt.de/8700/1/Complete_thesis%20-%20German.pdf
Hermans, Yannick <http://tuprints.ulb.tu-darmstadt.de/view/person/Hermans=3AYannick=3A=3A.html> : Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting. Technische Universität, Darmstadt [Ph.D. Thesis], (2019)
work_keys_str_mv AT hermansyannick interfaceanalysisanddevelopmentofbivo4andcufeo2heterostructuresforphotochemicalwatersplitting
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