Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
In the last decades, the sustained increase in energy consumption has led to an excessive use of fossil fuels to cover the demand. The resulting emissions of greenhouse gases have greatly contributed to the global climate change.[1] Therefore, in the urgent transition from a fossil fuels based economy to a carbon neutral society with circular economy, processes inspired by nature, such as photosynthesis, can be taken as source of inspiration. In particular, artificial photosynthesis aims for the efficient generation of fuels or chemical feedstocks (i.e. H2, MeOH, syngas, ethylene, etc.) from water or water/CO2 and sunlight energy. However, to achieve such a challenging objective, selective and efficient catalysts are needed.[2]
Nanoparticles (NPs) are heterogeneous catalysts with high active surface area whose performance can be tuned by means of surface functionalization (i.e. ligand-capping).[3] In the present communication, the synthesis of metallic nanoparticles by means of the organometallic approach is proposed as a way of obtaining tailored nanocatalysts. By the addition of molecular stabilizers under mild reducing conditions, this method allows obtaining NPs of controlled size and morphology.[4] Moreover, the stabilizers at the surface can have additional roles, such as the harvesting of light or as anchoring points to affix the hybrids to conductive/semiconductive supports.[5,6] In this regard, dyad systems, where the stabilizing agent is also a light harvesting entity, are of particularly interest. They are composed of a molecular photosensitizer (PS) and an electrocatalyst (NPs) which are at a close, fixed distance. Such a systems allow the study and fine-tuning of the electron transfer properties between the PS and the NPs. In our specific case the PSs used are ruthenium-bipyridine based molecular complexes. Additionally, the molecular PS can serve as anchoring point to a semiconductor, improving charge separation and diminishing charge recombination in photocatalysis.
G. Martí is supported by a PhD grant (FPU19/04322) by Ministerio de Universidades. G. Martí also wants to acknowledge The Royal Society of Chemistry for the funding through a Researcher Development Grant. MICINN is also gratefully acknowledged for financial support (PID2019-104171-RB).
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