NiMoO₄-Coated NiCo₂O₄ Nanotip Arrays on Carbon Cloth as Flexible and Effective Electrodes for Glu Detection

In this work, binary transition-metal oxide nanomaterial NiCo2O4@NiMoO4 nanotip arrays (NAs) with core–shell heterostructures were directly coated on carbon cloth (CC) by facial hydrothermal treatments. The prepared NiCo2O4@NiMoO4 NAs/CC was used as an advanced binder-free, flexible, and nonenzymatic electrode material for glucose (Glu) detection directly. Thanks to the synergistic effect of fast electron transport and penetration, the NiCo2O4@NiMoO4 NAs/CC heterojunction sensor presented superior Glu sensing properties and exhibited a low limit of detection (LOD) of 0.24 μM with an ultrahigh sensitivity of 9557 μA mM–1 cm–2 and, particularly, a fast response time (2.1 s) besides good selectivity or stability. Moreover, good accuracy and reproducibility can also be obtained for Glu determination in the human serum sample. The above conclusions demonstrate that the construction of the NiCo2O4@NiMoO4 NAs/CC heterojunction is conducive to the improvement of nonenzymatic Glu detection.