Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
The development of cheap and environmentally friendly fuels and chemicals whose production will be based on abundant and renewable resources appears as one of the main challenges in our society. Among different approaches, the direct use of sunlight for the valorisation of abundant resources, such as H2O, N2 or CO2, has been proposed as an appealing approach for the environmentally friendly and sustainable production of high added-value fuels and chemicals, such as H2, NH3, CH4, CO, CH3OH or CH2CH2, among others, the so-called “solar fuels”. In this context, the photochemical solar fuels production is currently limited by the low light-to-chemical efficiency and the fact that in semiconductor-based photocatalysts light harvesting is usually restricted to the UV and visible blue light, and typically is affected by low charge separation efficiency and high recombination rates. In an alternative mechanism, photons from the visible and near infra-red (NIR) regions may interact with metal nanoparticles by localized metal surface plasmon resonance (LSPR). Moreover, The presence of surface defects, such as oxygen vacancies heteroatom doping can promote non-radiative recombination events through phonon-phonon interactions, increasing the photocatalysts surface temperature upon light irradiation, When both pathways are combined, much higher production rates and conversions have been reported since photon absorption promotes a localized heating in the active sites due to the simultaneous photon energy thermalization and generation of “hot carriers”, which influence the electronic structure of the species involved in the reaction.
In this presentation, it will be shown the design and fabrication of advanced multifunctional materials for the photothermal CO2 hydrogenation and NH3 production reactions. Moreover, mechanistic studies aimed to unravel which are the actual active sites and operational mode will be commented in detail. This research has the potential to advance the field and pave the way for the sustainable production of fuels and chemicals.
The Spanish Ministry of Science and Innovation is gratefully acknowledged for the Ramon y Cajal research associate contract (RYC2021–031006-I financed support by MCIN/AEI/10.13039/501100011033 and by European Union/NextGenerationEU/PRTR) and the financial support (PID2022-141099OA-I00 funded by MCIN/AEI/10.13039/501100011033 and FEDER "Una manera de hacer Europa".
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Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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