University of Twente Student Theses


Controlled deposition of gold nanoparticles on faceted SrTiO3 photocatalyst particles

Heemstra, Berwout (2023) Controlled deposition of gold nanoparticles on faceted SrTiO3 photocatalyst particles.

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Abstract:The hydrogen economy is expected to grow in efforts to combat climate change. This is because hydrogen is a clean fuel that can be used without producing any greenhouse gases. In the production of hydrogen, among other applications, pho- tocatalysis could play a big role. In this process a photocatalyst needs a cocatalyst(s) in order to efficiently split water into hydrogen and oxygen. In this thesis a new method of facet-selectively depositing a gold cocatalyst onto faceted SrTiO3 particles is investigated. This method uses the electrical attraction between pre-formed gold nanoparticles and the SrTiO3 {100} facet as well as the electrical repulsion with the {110} facet. The stability, reproducibility and other parameters are explored, which could affect the coverage of the cocatalyst particles on the SrTiO3, such as salt con- centration and gold nanoparticle concentration. Additionally hotodeposition of gold onto SrTiO3 was done an alternative method of depositing the cocatalyst in order to observe its coverage and control. Finally the photocatalytic activity was tested of the SrTiO3 particles with colloidally deposited gold cocatalysts and of the SrTiO3 particles with photodeposited cocatalysts, which was done through photocatalytic degradation of methylene blue dye.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics, 51 materials science
Programme:Applied Physics MSc (60436)
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