Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.403
Publication date: 18th December 2023
The development of solar technologies for production of renewable fuels are interesting processes not only a way to reduce and reuse CO2 emissions, but also a way of storing solar energy by obtaining so-called solar fuels. Among, these technologies several processes have been included such as: H2 production, CO2 reduction or NH3 production, among others.
One of the main challenges is the elucidation of the reaction mechanisms that take place in these processes. In this sense, the development of new in-situ and operational characterization tools has become a powerful tool to understand these complex processes in depth. In this talk some examples will be given on different solar fuel production technologies.
Here, we will revise some examples of (photo)electro catalysts for H2 production. As example, the synthesis of well-controlled vertically aligned Ni/NiO nanocomposites consisting of Ni nanoclusters embedded in NiO, which result in highly efficient electrocatalysts for overall water splitting. We show that such a high catalytic efficiency toward both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) originates from a synergetic effect at Ni/NiO interfaces that significantly reduces the energy barrier for water dissociation, and favours the formation of reactive H* intermediates on the Ni side of the interface, and OHads on the NiO side of the interface.
On the other hand, also will show the non-innocent role of the vanadium dopant in TiO2 in the photoelectrochemical properties. In situ XAS measurements of the V K-edge revealed that the vanadium ions, beyond improving the redox behavior of the host, also actively participate in the reduction process. The significant changes in the V K-edge XANES and EXAFS spectra observed under reduction conditions can be ascribed to a change in the structure and oxidation state of the vanadium ions during the electrochemical reaction.
This work has been funded by HYSOLCHEM which has received Funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 101017928
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