Ir/Co/NiSe₂ Nanocages as High-Performance Electrocatalysts for Water Splitting and Sensors

In recent years, with the development of nanotechnology, there has been significant progress in the provision and functionalization of nanomaterials based on Ir nanostructures. It is possible to design different Ir-based nanoelectrolysts with improved performance and favorite structure using nanoengineering methods. In this study, porous Ir/Co/NiSe 2 nanocages (NCs) were prepared using the sacrificial template approach, ion exchange strategy, and selenization under heat treatment. The designed Ir/Co/NiSe 2 NCs were applied to modify the surface of the glassy carbon electrode (GCE) to use as an effective multifunctional electrocatalyst for the O 2 and H 2 evolution reactions (OER and HER) and glucose oxidation in an alkaline medium. The Ir/Co/NiSe 2 NCs/GCE due to the using the advantages of a three-dimensional porous polymetallic hollow nanostructure, including providing high surface area and numerous electrochemical active sites, fast electron/mass transfer, high conductivity, and open channels for effective gas release in the OER and HER reactions, exhibits improved electrochemical performance. The Ir/Co/NiSe 2 NCs/GCE delivered a current density of 100 mA cm –2 at 1.55 V for OER and −0.21 V for HER and determined glucose in the linear ranges of 100.0 nM to 2.0 mM and 2.0–17.0 mM with a limit of detection of 30 nM and sensitivity of 4375.8 and 477.7 μA mM –1 cm –2, respectively.