Regensburg 2016 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 90: Poster III
HL 90.42: Poster
Thursday, March 10, 2016, 16:00–19:00, Poster A
Investigations into Optoelectronic Properties of Carbon Nitrides for Solar Hydrogen Production — •Filip Podjaski1, Juan Galisteo-López2, Brian Tuffy1, Katharina Schwinghammer1, Hernán Míguez2, and Bettina V. Lotsch1,3 — 1Max-Planck-Institute for Solid State Research, Stuttgart, Germany — 2Institute of Material Science of Sevilla, Sevilla, Spain — 3Department of Chemistry, University of Munich (LMU), Munich, Germany
Since the discovery of water splitting on TiO2 under UV-illumination by Honda and Fujishima in 1970s, a lot of materials and cocatalysts have been investigated to produce hydrogen from water using sunlight. A recent discovery has shown that carbon nitrides, consisting only of abundant elements, are able to perform visible light-driven hydrogen evolution. Our research focuses on the understanding and enhancement of charge transfer properties in these semiconducting polymers that lead to improved hydrogen evolution. Time resolved photoluminescence measurements suggest the use of a more general approach than used nowadays in literature to describe the complex decay processes after photo-excitation. Our results reveal how the particle size, the presence of sacrificial donors and how cocatalysts attached to the surface influence the lifetimes of excited states. This findings may lead to a better understanding of the different environmental contributions in homogeneous catalysis and can be used to achieve better charge transfer properties using these materials in heterojunctions for visible light water splitting.