2D/2D h‐BN/N‐doped MoS 2 Heterostructure Catalyst with Enhanced Peroxidase‐like Performance for Visual Colorimetric Determination of H 2 O 2

Recently, nanozymes have attracted extensive attention because of their advantages of combining nanomaterials with enzymes. Herein, hexagonal boron nitride (h‐BN) and nitride‐doped molybdenum disulfide (N−MoS 2 ) nano‐composites (h‐BN/N−MoS 2 ) were synthesized by facile and cost‐effective liquid exfoliation with a solvothermal method in nontoxic ethanol solution. The results show that h‐BN, as a co‐catalyst, can not only dope into the lattice of MoS 2 but also form a heterogeneous structure with MoS 2 NSs. It expanded the layer spacing and specific surface area of MoS 2 NSs, which was beneficial to the contact between the catalyst and the substrate, and resulted in a synergistic enhancement of the catalytic activity of hydrogen peroxide (H 2 O 2 ) with MoS 2 . A colorimetric determination platform of h‐BN/N−MoS 2 ‐TMB‐H 2 O 2 was constructed. It exhibited a wide linear range of 1–1000 μM with a low limit of detection (LOD) of 0.4 μM under optimal conditions, high sensitivity and stability, as well as good reliability (99.4–110.0%) in practice, making the measurement system more widely applicable.1. Introduction