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HEIndividual fellowship2023–2025

HEACAT · Electrocatalytic activity and dissolution stability of high entropy alloys at the atomic scale

Horizon Europe — Marie Skłodowska-Curie Actions

Duration
2023-11-01 → 2025-10-31
EU contribution
€214,934
Participants
1
Scheme
HORIZON-TMA-MSCA-PF-EF

Lines connect the coordinator with its partners.

Results in brief

Electrocatalytic activity and dissolution stability of high entropy alloys at the atomic scale

The HEACAT project addresses one of the most pressing challenges in sustainable energy: developing efficient and durable catalysts for water splitting, a key process for producing green hydrogen. Current catalysts often rely on scarce noble metals while non-noble metal alternatives frequently lack stability under harsh operating conditions. High-entropy alloys (HEAs), composed of multiple non-noble metallic elements in near-equal proportions, offer a promising class of electrocatalysts thanks to their unique combination of chemical complexity, structural stability, and tunable surface properties. The overall objective of HEACAT is to evaluate the catalytic activity and corrosion resistance of a model HEA surface for water-splitting reactions at the atomic and nanometric scales, specifically the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). To achieve this, the project developed advanced methodologies for preparing and characterizing HEA surfaces under ultra-high vacuum (UHV) conditions and for monitoring their compositional and structural evolution when exposed to oxygen, water vapor, and electrolytes. The ultimate goal is to understand how the high-entropy effect influences catalytic performance and to design strategies for optimizing activity and stability.

Data: CORDIS, © European Union

Project objective

The Covid-19 pandemic and the international conflicts are now having a significant impact on energy systems around the world, potentially slowing the expansion of clean energy applications. European energy safety can only be ensured by accelerating the development of cheap and clean energy. Catalysts for the chemical reactions in energy conversion and storage, such as fuel cells and water-splitting, are critical to achieve large-scale clean energy production. However, the scarcity of noble metals (such as Pt, Ir), currently the state-of-the-art catalysts, limit their apllications. Co, Fe and Ni oxides are proved to be earth abundant alternative catalysts. Corrosion of these transition metal-based electrocatalysts is inevitable, particularly for the oxygen evolution reaction of water splitting. Transition metal-based high entropy alloys (HEAs), the homogeneous “mixtures” at the atomic level of at least 5 transition metals, exhibit high electrocatalytic activity compared to binary oxides and also high corrosion resistance compared to stainless steels. These unusual properties of HEAs arise from atomically ordered but elementally disordered structures, which are poorly understood. I will explore, for the first time, the surface disorder of HEAs at the atomic scale, by synthesizing nanofilms of 5-element alloys in ultra-high vacuum (UHV) and using advanced surface analytical techniques (mainly STM, XPS). I will perform electrochemical measurements on synthesized model HEAs’ surfaces in a home-made movable reaction cell that can be connected to different UHV systems, in order to correlate atomic-scale structures with catalytic and anti-corrosion properties. I will merge my previous expertise in STM, XPS techniques and surface reactivity of ternary alloys into the host’s experience in thin film alloy synthesis and catalysis. The overall objective of this project is to find the balance between the activity and the stability of HEAs for water splitting electrocatalysis.

Original text from CORDIS.

Participants

  • AARHUS UNIVERSITET · Aarhus CCoordinatorDenmark

Links

Data: CORDIS, © European Union