biostudies-literatureUnknown13(25)Cai ZThe development of low-cost and high-durability bifunctional electrocatalysts is of considerable importance for overall water splitting (OWS). This work reports the controlled synthesis of nickel-iridium alloy derivative nanochain array electrodes (NiIr_<i>x</i> NCs) with fully exposed active sites that facilitated mass transfer for efficient OWS. The nanochains have a self-supported three-dimensional core-shell structure, composed of a metallic NiIr_<i>x</i> core and a thin (5-10 nm) amorphous (hydr)oxide film as the shell (<i>e.g.</i>, IrO₂/NiIr_<i>x</i> and Ni(OH)₂/NiIr_<i>x</i>). Interestingly, NiIr_<i>x</i> NCs have bifunctional properties. Particularly, the oxygen evolution reaction (OER) current density (electroRSC advances17315-17323https://www.ebi.ac.uk/biostudies/studies/S-EPMC10249465biostudies-literatureUltralow-iridium content NiIr alloy derivative nanochain arrays as bifunctional electrocatalysts for overall water splitting.PMC10249465Chen AWang PBu XZhang JCai ZChen YWang XYan YXu JZhao XfalseUltralow-iridium content NiIr alloy derivative nanochain arrays as bifunctional electrocatalysts for overall water splitting.The development of low-cost and high-durability bifunctional electrocatalysts is of considerable importance for overall water splitting (OWS). This work reports the controlled synthesis of nickel-iridium alloy derivative nanochain array electrodes (NiIr_<i>x</i> NCs) with fully exposed active sites that facilitated mass transfer for efficient OWS. The nanochains have a self-supported three-dimensional core-shell structure, composed of a metallic NiIr_<i>x</i> core and a thin (5-10 nm) amorphous (hydr)oxide film as the shell (<i>e.g.</i>, IrO₂/NiIr_<i>x</i> and Ni(OH)₂/NiIr_<i>x</i>). Interestingly, NiIr_<i>x</i> NCs have bifunctional properties. Particularly, the oxygen evolution reaction (OER) current density (electro2023-01-01T00:00:00Z2023 Jun2025-04-27T02:24:05.479Z2025-04-06T18:32:17.281ZS-EPMC102494653730476810.1039/d3ra01845h