Heterogeneous Nanostructure Design Based on the Epitaxial Growth of Spongy MoS x on 2D Co(OH)2 Nanoflakes for Triple-Enzyme Mimetic Activity: Experimental and Density Functional Theory Studies on the Dramatic Activation Mechanism

ACS Applied Materials & Interfaces
Yongqi DingYuqing Lin

Abstract

In this study, we present a three-in-one catalytic platform for intrinsic oxidase-, peroxidase-, and catalase-like activity, which is enabled by epitaxial growth of the MoS x nanosponge on 2D Co(OH)2 nanoflakes [2D Co(OH)2 NFs] (CoMo hybrids). First, the 2D Co(OH)2 NFs are stripped from hierarchical three-dimensional Co(OH)2 nanoflowers which are synthesized in an eco-friendly way via one-step surfactant-free chemical route. Next, the porous MoS x nanosponge is decorated on the 2D Co(OH)2 NFs' surface using a solvothermal process forming heterogeneous nanostructured CoMo hybrids. Finally, because of the host-guest interaction, that is, after the epitaxial growth of spongy MoS x on 2D Co(OH)2 NFs, the heterogeneous nanostructure of CoMo hybrids exhibits unpredictable triple-enzyme mimetic activity simultaneously. The mechanisms of the oxidase-like properties are investigated by density functional theory (DFT) calculations, and it is discovered that a simple reaction/dissociation of O2 absorbed on Co-Mo thin films can explain the enhanced oxidase-like activity of the CoMo hybrids. In addition, the CoMo hybrids are also reproducible, stable, and reusable, that is, after 10 cycle uses, >90% mimic enzyme activity of the CoMo hybrids...Continue Reading

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Citations

Jun 18, 2020·Analytical Chemistry·Huanhuan XingErkang Wang

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