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

Abstract : Solar photo(electro)chemical (PEC) water splitting is regarded as a promising ways of renewable hydrogen production. In this work, heterostructures based on BiVO4 and CuFeO2were chosen to perform the water oxidation and water reduction reaction, respectively. However, the exact benefits of the contact materials in these heterostructures have not yet been completelyelucidated. Hence, we opted in this work to investigate the junction properties of certainBiVO4 and CuFeO2 based heterostructures through so called interface experiments, where by a certain contact material was step wise sputtered on to 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 CuFeO2and BiVO4 based heterostructured powders were created through photodeposition. These powders were tested as well for their performance in photochemical water splitting.
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Yannick Hermans. Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting. Other. Université de Bordeaux; Technische Universität (Darmstadt, Allemagne), 2019. English. ⟨NNT : 2019BORD0060⟩. ⟨tel-02612225⟩

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