20.500.12556/RUL-176557 Engineering Ru@Ir core–shell nanoparticles on titanium oxynitride–graphene support for a highly active and durable pH-universal hydrogen evolution reaction The rational design of electrocatalysts with high activity, durability, and low precious metal content is key to advancing hydrogen production via water electrolysis. Here, we present a multifunctional electrocatalyst based on Ru@Ir core−shell nanoparticles anchored on a conductive titanium oxynitride−graphene hybrid support (Ru@Ir/TiO$_x$N$_y$-C), achieving superior performance for the hydrogen evolution reaction (HER) in both acidic and alkaline media. The combination of the core−shell Ru@ Ir architecture and the strong metal−support interaction (MSI) with TiO$_x$N$_y$ optimizes hydrogen and hydroxide adsorption energies, as confirmed by X-ray photoelectron spectroscopy and density functional theory (DFT) calculations. In alkaline media, Ru@Ir/ TiO$_x$N$_y$-C outperforms commercial Pt/C with a remarkably low overpotential of 13 mV at 10 mA cm$^{−2}$ and high mass activity, while in acidic conditions, it rivals Pt/C and surpasses monometallic analogs. The long-term stability of the composite is attributed to the enhanced nanoparticle anchoring and structural integrity provided by the TiO$_x$N$_y$ support. This work shows that combining core−shell nanostructures with engineered conductive supports can effectively replace platinum in HER applications. Such a nanocomposite strategy offers a versatile platform for the development of advanced electrocatalysts across a broad range of energy conversion reactions. hydrogen evolution reaction iridium ruthenium core−shell structures TiO$_x$N$_y$ MSI DFT catalysts evolution reactions nanoparticles oxides transition metals kemijska tehnologija reakcija razvoja vodika HER nanodelci elektrokatalizator true false true Angleški jezik Slovenski jezik Članek v reviji 2025-12-03 14:40:55 2025-12-03 14:40:56 2025-12-22 04:03:55 0000-00-00 00:00:00 2025 0 0 Str. 13444–13457 iss. 15 Vol. 15 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66 2155-5435 10.1021/acscatal.5c02831 244138499 engineering-ru-ir-core-shell-nanoparticles-on-titanium-oxynitride-graphene-support-for-a-highly-active-and-durable-ph.pdf engineering-ru-ir-core-shell-nanoparticles-on-titanium-oxynitride-graphene-support-for-a-highly-active-and-durable-ph.pdf 1 E9BB73D1FE481CD87099384ADB39C6FA 0454bd8e90c948c35d378c23fc26ce9bbc5aad1108d4f8af16c757666a66eb0b ddd65c6d-d04d-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222959 https://pubs.acs.org/doi/10.1021/acscatal.5c02831 1 502d3090-d04d-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222958 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0