Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.358
Publication date: 18th July 2023
Roughly 95 % of the hydrogen consumed in Europe and over 95% of organic chemicals still rely on fossil resources. Therefore, finding alternative resources and clean technologies to mine those chemicals is instrumental to secure a sustainable chemical industry. The prospects of sourcing hydrogen from water and upcycling carbon dioxide and lignocellulosic biomass into chemical commodities and fine chemicals has paved the way for the advent of a new generation of technologies and concepts in this chemical space. Among them, (photo)electrochemical and photocatalytic approaches have gained in recent years capitalizing on their scalability, competitive performance and low-cost. To date, however, these technologies still remain at an early stage of development displaying conversion efficiencies below the expectations. A better understanding of the fundamental processes that govern the catalytic transformations at the reactive interface, together with innovative manufacturing protocols to engineer the materials holds the key to rationally advance these promising technologies.
In this talk, we will discuss our most recent progress in the fields of photoelectrochemical (PEC) water splitting and carbon dioxide conversion, as well as new electrochemical and photocatalytic platforms for biomass valorization. Firstly, we will describe various methodologies to improve the performance of photoelectrodes (chalcogenides, metal oxides) for solar water splitting while identifying the key processes that limit the catalytic response. Likewise, we will show the prospects of driving the PEC CO2 conversion directly at the semiconductor-liquid interface when using chalcopyrite electrodes and how the nature of the solvent dictates the response. Secondly, we will present various photocatalytic reactors, based on semiconductor nanocrystals and photoredox systems, capable of driving the selective fragmentation of lignocellulosic biomass into simple aromatics. In addition, electrochemical reactors for lignin valorization will be presented including a detailed mapping of the catalytic activity – composition relationships of the electrodes.
This work was supported by the Swiss National Science Foundation (SNSF) under the Ambizione Energy Grant (PZENP2_166871), and by the Spanish Ministry of Science & Innovation through the “Ramon y Cajal” Program (RYC2018-023888-I) and the RETOS #PID2021-128805NA-I00 project. The project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 948829).
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