Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.497
Publication date: 16th December 2024
The alkaline oxygen evolution reaction (OER) is crucial for green hydrogen production via water electrolysis. However, its industrial implementation at high current densities remains limited due to the scalability, overpotential, and stability challenges of current commercial electrocatalysts. Layered hydroxides (LH), particularly those based on abundant transition metals, are emerging as promising alternatives owing to their remarkable electrochemical properties.
In this talk, we will present the latest advances from the 2D-Chem research group (www.icmol.es/2dchem) in the synthesis and characterization of novel two-dimensional (2D) LH materials. Specifically, we have developed an industrially scalable, room-temperature, atmospheric-pressure homogeneous alkalinization synthetic pathway to produce optimized NiFe layered double hydroxide (NiFe-LDH). By leveraging the nucleophilic attack of chloride on an epoxide ring, we have achieved a low-dimensional, highly defective NiFe-LDH exhibiting pronounced cation clustering and excellent electrochemical performance. Spectroscopic studies, including in-operando XANES, EXAFS, SAXS or Raman combined with ab-initio calculations reveal the critical role of Fe clustering in lowering the energy pathway for improved catalytic activity.
Furthermore, we have extended this synthetic route to other compositions that will demonstrate the versatility of these materials beyond green hydrogen production. Indeed, in-situ XAS and PXRD studies provide further insights into the behavior of these layered materials during operation, allowing their use as precursors for metallic nanocomposites with applications in energy storage. Finally, optimized LDH and hybrid LDH-nanocarbon electrocatalysts with tailor made compositions can also play a pivotal role in alkaline electrochemical water treatment for the remediation of contaminated water systems, offering a sustainable approach for pollutant degradation and removal.
This work was supported by the European Union and the Clean Hydrogen Partnership and its members under a Horizon Europe - RIA Project (SEAL HYDROGEN - Grant Agreement No 101137915), European Research Council (ERC Starting Grant No. 2D-PnictoChem 804110 and ERC-2022-POC2 -101101079), the Spanish MICINN (PID2022-143297NB-I00, PID2022-142657OB-I00, MRR/PDC2022-133997-I00, TED2021-131347BI00 and Unit of Excellence “Maria de Maeztu” CEX2019-000919-M) and the Generalitat Valenciana (CIDEGENT/2018/001). This work was supported by Agencia Valenciana de la Innovació, AVI, through the project: INNEST/2024/564, STELAH.
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