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Interface and catalyst investigation for solar water splitting

Klett, Joachim (2016):
Interface and catalyst investigation for solar water splitting.
Darmstadt, Technische Universität, [Online-Edition: http://tuprints.ulb.tu-darmstadt.de/5396],
[Ph.D. Thesis]

Abstract

In this thesis model experiments for a photoelectrochemical water splitting device were performed. The goal was to identify loss mechanisms that reduce the efficiency of the photoelectrochemical device. This includes losses associated with solid state contacts, i.e. charge transfer into the protection layer and catalyst particles, as well as overvoltage losses encountered during catalysis.

Additionally, fundamental photoelectron spectroscopy measurements revealed the complicated nature of small supported catalyst particles. Here, a direct dependence of their electronic structure with respect to their substrate material and deposition techniques was identified. Furthermore, subsequent water adsorption also changes the energetic alignment between support and catalyst.

Item Type: Ph.D. Thesis
Erschienen: 2016
Creators: Klett, Joachim
Title: Interface and catalyst investigation for solar water splitting
Language: English
Abstract:

In this thesis model experiments for a photoelectrochemical water splitting device were performed. The goal was to identify loss mechanisms that reduce the efficiency of the photoelectrochemical device. This includes losses associated with solid state contacts, i.e. charge transfer into the protection layer and catalyst particles, as well as overvoltage losses encountered during catalysis.

Additionally, fundamental photoelectron spectroscopy measurements revealed the complicated nature of small supported catalyst particles. Here, a direct dependence of their electronic structure with respect to their substrate material and deposition techniques was identified. Furthermore, subsequent water adsorption also changes the energetic alignment between support and catalyst.

Place of Publication: Darmstadt
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 08 May 2016 19:55
Official URL: http://tuprints.ulb.tu-darmstadt.de/5396
URN: urn:nbn:de:tuda-tuprints-53969
Referees: Schäfer, Prof. Dr. Rolf and Jaegermann, Prof. Dr. Wolfram and Hess, Prof. Dr. Christian and Kramm, Prof. Dr. Ulrike
Refereed / Verteidigung / mdl. Prüfung: 22 March 2016
Alternative Abstract:
Alternative abstract Language
In dieser Arbeit wurden Modellexperimente zum Verständnis einer photoelektrochemischen Zelle zur Wasserspaltung durchgeführt. Das Ziel war hierbei die Identifikation der auftretenden Verlustmechanismen, welche die Effizienz der elektrochemischen Zelle mindern. Hierzu müssen sowohl Verluste an Festkörpergrenzflächen, als auch Überspannungsverluste des Katalysators berücksichtigt werden. Dazu wurden grundlegende Untersuchungen mit Hilfe der Photoelektronspektroskopie an geträgerten Katalysatorpartikeln vorgenommen. Hierbei wurde festgestellt, dass die elektronische Struktur dieser Partikel sowohl vom Substratmaterial, als auch der Depositionsmethode abhängt. Sobald zusätzlich Wasser auf der Oberfläche adsorbiert wird, ändert sich wiederum die elektronische Anpassung zwischen Substrat und Katalysator.German
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