In this study, we report successful synthesis of ultrafine worm-like Ir-oriented nanocrystalline assemblies (ONAs) and their further use as efficient electrocatalysts towards the HOR/HER in an alkaline medium. Due to the fast mass/charge transfer rate as well as the appearance of the long segments of low-index crystalline planes, the as-synthesized Ir ONAs exhibit a remarkable performance for the HOR/HER in an alkaline electrolyte.

        https://doi.org/10.1039/C7TA07635E