CHEMISTRY AND MATERIAL SCIENCE

Facile synthesis and characterization of FeCoNiPt alloy nanoparticle electrocatalysts with different Pt content

O. V. Alexeeva, O. K. Karyagina, S. S. Kozlov, L. I. Kuznetsov, L. L. Larina, A. B. Nikolskaia, O. I. Shevaleevskii

N. M. Emanuel Institute of Biochemical Physics RAS, Solar Photovoltaic Laboratory, Moscow, Russia

Abstract: In this work, we present a facile synthesis of FeCoNiPt alloy nanoparticles (NPs) with tunable plat- inum content (10–30 at.%). The NPs were produced by medium-assisted solid-state reaction using acetylacetonate metal precursors. The structural characterization (TEM, HRTEM, STEM-EDS, and XRD) reveals that the obtained FeCoNiPt NPs exhibit a uniform morphology with an average diameter of 3–7 nm and crystallize in a single-phase face-centered cubic solid solution. Increasing the Pt content leads to lattice expansion and a systematic increase in crystallite size, consistent with the larger atomic radius of Pt. STEM-EDS elemental maps confirm homogeneous incorporation of Fe, Co, Ni, and Pt across individual nanoparticles, demonstrating the successful formation of a multicomponent alloy. This study demonstrates that tuning Pt content in FeCoNiPt multicomponent alloys enables precise modulation of d-band electronic structure. The proposed synthesis approach is simple, cost-effective, and scalable, offering a promising pathway for designing Pt-optimized electrocatalysts.

Keywords: nanoparticles, multicomponent alloys, HRTEM, electrodes, electrocatalysis.

Received: 19.11.2025
Revised: 29.11.2025
Accepted: 04.12.2025

Language: English

DOI: 10.17586/2220-8054-2025-16-6-919-924