Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.175
Publication date: 11th July 2022
The development of sustainable strategies for the production of added-value chemicals and fuels using renewable resources is particularly attractive to promote a transition towards a more sustainable energetic landscape, overcoming the dependence of fossil fuels at a global scale.[1] One of the most promising alternatives involves the use of renewable electricity (wind, solar, hydropower, etc…) to power electrochemical conversion processes, which convert abundant molecules (e.g., water, carbon dioxide, and nitrogen) into higher-value products (e.g., hydrogen, hydrocarbons, oxygenates, and ammonia). In all these processes, (photo)-electrocatalytic water oxidation stands out as the preferred reaction to provide the protons and electrons needed for the target reduction reactions. In this context, metal oxides of earth-abundant elements (Fe, Ni, Co, etc…) are identified as excellent candidates, since these materials can fulfil most of the needed requirements, although in some cases their performance needs to be improved for a more realistic technological assessment. On the other hand, a clear mechanistic understanding of the physical-chemical processes taking place during operation is essential. In the present contribution, we will describe our efforts to understand the operation mechanisms of different metal oxides (mainly NiOx)[2-5] and other systems (CoFe prussian blue derivatives) for electrochemical water oxidation, as well as other electrochemical processes, [6-7] with particular emphasis on enhancing their performance. Our studies focus on the correlation of the (photo)electrochemical response of the materials with a detailed structural, optoelectronic and photoelectrochemical characterization carried out by different microscopic and spectroscopic tools.
The authors would like to thank the Ministerio de Ciencia e innovación by project PID2020-116093RB-C41.
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