Continuous spark plasma synthesis of Au/Co binary nanoparticles with tunable properties

Villy, Lajos Péter and Kohut, Attila and Kéri, Albert and Bélteki, Ádám and Radnóczi, György and Fogarassy, Zsolt and Radnóczi, György Zoltán and Galbács, Gábor and Geretovszky, Zsolt (2022) Continuous spark plasma synthesis of Au/Co binary nanoparticles with tunable properties. SCIENTIFIC REPORTS, 12 (1). ISSN 2045-2322

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Abstract

We present here a scalable and environmentally friendly gas phase technique employing atmospheric pressure electrical spark discharge plasmas for the production of Au/Co binaries, an effective catalyst system for the decomposition of hydrogen-rich compounds, such as ammonium borane. We demonstrate that Au/Co alloy nanoparticles can be produced via the spark plasma-based technique. The possibility of varying the morphology and phase structure via real time heat treatment of the generated aerosol to form Au/Co/CoO particles with continuous control over a wide particle compositional range (from 24 to 64 at.% [Co]/([Co] + [Au]) content) is also demonstrated. Since our spark-based approach is proven to be capable of providing reasonable particle yields, these results may contribute to the transition of lab-scale, nanocatalyst-based hydrogen storage systems to real world applications.

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