Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
The rapid depletion of fossil fuels and the environmental concerns are the main threats that humanity is facing in the 21st century. Therefore, the transition toward an energetic system based on renewable and environmentally friendly energy sources has become mandatory for a sustainable future. In this regard, molecular hydrogen (H2) is considered the most promising “green” alternative to fossil fuels. However, currently almost all the produced H2 (∼96%) comes from processes involving non-renewable energy sources, in particular from steam reforming of methane. Although steam reforming allows high hydrogen yield efficiency (∼74%), this production technique suffers from the issue of the high level of CO2 emissions. Thus, with the aim to realize the so-called “hydrogen economy”, i.e., a society based on a clean and sustainable energy system, an alternative pathway for hydrogen production is urgently needed. In particular, photocatalytic water splitting, i.e., the decomposition of water in hydrogen and oxygen by using sunlight is considered a very attractive approach. Since the discovery of the water splitting effect, titanium dioxide (TiO2) was used as benchmark photocatalyst material. As this process occur in an aqueous environment, a full understanding of the interaction of water with TiO2 is crucial on the one hand to improve the performance of TiO2 as photocatalyst, and on the other hand to better explain the physic-chemical mechanisms that regulate the water splitting reactions.
In this work, I will describe an experimental method based on Fourier Transform Infrared Spectroscopy to describe the TiO2/water interface, by studying the OH stretch band in a TiO2 layer changing the hydration level of the sample.
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