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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.09711 |
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| _version_ | 1866909899779211264 |
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| author | Nallathambi, Varatharaja Puthussery, Aneeta Jose Mingers, Andrea M. Stuckert, Robert Olean-Oliveira, André Reichenberger, Sven Raabe, Dierk Čolić, Viktor Gault, Baptiste Barcikowski, Stephan |
| author_facet | Nallathambi, Varatharaja Puthussery, Aneeta Jose Mingers, Andrea M. Stuckert, Robert Olean-Oliveira, André Reichenberger, Sven Raabe, Dierk Čolić, Viktor Gault, Baptiste Barcikowski, Stephan |
| contents | Low-cost transition metal high-entropy nanoalloys are emerging as sustainable alternatives to platinum group electrocatalysts. Synthesis conditions of single-phase solid solutions can alter phase stability, causing surface composition changes that affect electrocatalytic performance. Here, we propose to exploit the metastability of carbon-doped Cantor alloy-based amorphous high-entropy alloy nanoparticles produced by nanosecond-pulsed laser synthesis in organic solvents. In situ electron microscopy reveals crystallization and partitioning of elements upon heating to 600 °C, forming heterostructured nanoparticles with reinforced carbon shells that exhibit a 5- to 7-fold enhancement of the electrocatalytic activity compared to the as-synthesized counterparts for the oxygen evolution reaction. We demonstrate the strategic utilization of phase metastability in high-entropy nanoalloys through post-synthesis annealing to enhance the electrochemical activity of laser-generated nanoparticles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_09711 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Controlling Metastability through Annealing of High-Entropy Nanoalloy Electrocatalysts to Boost Performance towards the Oxygen Evolution Reaction Nallathambi, Varatharaja Puthussery, Aneeta Jose Mingers, Andrea M. Stuckert, Robert Olean-Oliveira, André Reichenberger, Sven Raabe, Dierk Čolić, Viktor Gault, Baptiste Barcikowski, Stephan Materials Science Low-cost transition metal high-entropy nanoalloys are emerging as sustainable alternatives to platinum group electrocatalysts. Synthesis conditions of single-phase solid solutions can alter phase stability, causing surface composition changes that affect electrocatalytic performance. Here, we propose to exploit the metastability of carbon-doped Cantor alloy-based amorphous high-entropy alloy nanoparticles produced by nanosecond-pulsed laser synthesis in organic solvents. In situ electron microscopy reveals crystallization and partitioning of elements upon heating to 600 °C, forming heterostructured nanoparticles with reinforced carbon shells that exhibit a 5- to 7-fold enhancement of the electrocatalytic activity compared to the as-synthesized counterparts for the oxygen evolution reaction. We demonstrate the strategic utilization of phase metastability in high-entropy nanoalloys through post-synthesis annealing to enhance the electrochemical activity of laser-generated nanoparticles. |
| title | Controlling Metastability through Annealing of High-Entropy Nanoalloy Electrocatalysts to Boost Performance towards the Oxygen Evolution Reaction |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.09711 |