Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.121
Publication date: 22nd December 2022
Hydrogen and other solar fuels have been highlighted as one of the future energy vectors. Having natural photosynthesis as inspiration, we can develop a device capable to split water using sunlight, obtaining oxygen and hydrogen. [1], [2] Different strategies can be used to achieve this: from separated light harvesting and catalytic systems to all integrated devices able to transform directly sunlight into fuels. In both approaches the catalyst is pivotal to improve the system efficiency. Although rapid progress is being made in the field, understanding of the limiting factors of these catalysts has allowed remarkable improvements in their performance.
In this talk I will discuss different approaches to modify the activity of metal/metal oxide nanoparticles towards redox catalytic processes for water splitting. Nanoparticles are excellent catalysts due to their high surface/volume ratio and electronic and chemical surface properties.[3],[4] Consequently, several strategies can be used to modulate the activity of NP towards catalytic processes. In this talk I will discuss how doping, NP size and surface functionalization effects the catalytic activity of Ni/NiOOH NPs for oxygen evolution in the first case and Ru NP for hydrogen in the other two.[5] I will discuss these effects in terms of electrocatalytic activity and thoughtful characterisation of the system: spectroelectrochemical experiments, XPS, TEM, SEM, TOF-Sims, ATP, etc. All this acquired knowledge will help to systematically improve the next generation of catalysts for water splitting.
AEI for the project "LiWo" (PID2021-128197NA-I00), the Ramón y Cajal Program (RYC2018-025394-I Fellowship) and the Royal Society of Chemistry (R20-8077 Research Fund)
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