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Hierarchical core–shell IrO₂@NiO nanowires (NWs) have been designed through two simple steps, which combined electrospinning of IrO₂ conductive core and chemical bath deposition growth of ultracontinuous NiO nanoflakes. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy-dispersive X-ray spectrometry mapping, and X-ray photoelectron spectroscopy were employed to characterize the morphologies and structures of the as-prepared samples, and the results were also carefully compared with that of pure NiO nanoflowers and IrO₂ NWs. Electrochemical studies indicate that the as-prepared core–shell IrO₂@NiO NWs exhibited excellent nonenzymatic detection ability to glucose. At 0.35 V, it offered a sensitivity of 1439.4 μA mM^–1 cm^–2 (one order higher than pure NiO) with a wider linear range from 0.5 μM to 2.5 mM, a low detection limit of 0.31 μM (signal-to-noise ratio …