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Design Guidelines for High-Performance Particle-Based Photoanodes for Water Splitting: Lanthanum Titanium Oxynitride as a Model.
Journal article

Design Guidelines for High-Performance Particle-Based Photoanodes for Water Splitting: Lanthanum Titanium Oxynitride as a Model.

  • Landsmann S Laboratory Materials for Energy Conversion, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, Switzerland. steve.landsmann@empa.ch.
  • Maegli AE Institute of Non-Metallic Materials, Clausthal University of Technology, Zehntnerstrasse 2a, 38678, Clausthal-Zellerfeld, Germany.
  • Trottmann M Laboratory Materials for Energy Conversion, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, Switzerland.
  • Battaglia C Laboratory Materials for Energy Conversion, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, Switzerland.
  • Weidenkaff A Institute for Material Science, University of Stuttgart, Heisenbergstraße 3, 70569, Stuttgart, Germany.
  • Pokrant S Laboratory Materials for Energy Conversion, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, Switzerland.
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  • 2015-09-12
Published in:
  • ChemSusChem. - 2015
onset potential
photocurrent
photoelectrodes
semiconductors
water splitting
Catalysis
Electrodes
Lanthanum
Solar Energy
Titanium
Water
English Semiconductor powders are perfectly suited for the scalable fabrication of particle-based photoelectrodes, which can be used to split water using the sun as a renewable energy source. This systematic study is focused on variation of the electrode design using LaTiO2 N as a model system. We present the influence of particle morphology on charge separation and transport properties combined with post-treatment procedures, such as necking and size-dependent co-catalyst loading. Five rules are proposed to guide the design of high-performance particle-based photoanodes by adding or varying several process steps. We also specify how much efficiency improvement can be achieved using each of the steps. For example, implementation of a connectivity network and surface area enhancement leads to thirty times improvement in efficiency and co-catalyst loading achieves an improvement in efficiency by a factor of seven. Some of these guidelines can be adapted to non-particle-based photoelectrodes.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/93082
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