University of Twente Student Theses


Photocatalytic watersplitting with WO3 and SrTiO3 : Rh on a chip

Koolstra, Rense (2015) Photocatalytic watersplitting with WO3 and SrTiO3 : Rh on a chip.

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Abstract:Photocatalasis can be used as method to split water in hydrogen and oxygen. The goal of this project was to successfully integrate the photocatalysts WO3 and SrTiO3:Rh in a Z-scheme configuration to split water. First WO3 and SrTiO3:Rh are integrated on Si/Pt substrates, there cyclic voltametry and chronoamerometry measurements have been made with a solar simulator to measure their photocatalytic activity. UPS mea- surements have been made to see if there would be a hindering Schottky-barrier at the interfaces of the photocatalysts and the Pt. The cyclic voltametry measurements showed that WO3 has good photocatalytic activity while SrTiO3:Rh has little photocat- alytic activity. The chronoamperometry measurements showed that a small current of a few µA was created when the photocatalysts where illuminated by a solar simulator, indicating that there are electron-hole pairs created in the photocatalysts. The UPS showed shottkey-barriers favorable for separating electron-hole pairs. Secondly both photocatalists are integrated on Pt membranes with Si support. One on each side. By the membranes it couldn't be averted that WO3 also grew on the SrTiO3:Rh side of the membrane. GC measurements of the membrane showed hydrogen production but no oxygen production.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:35 chemistry
Programme:Chemical Engineering BSc (56960)
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