Ultrafine Platinum Nanoparticles Confined in a Covalent Organic Framework for Enhanced Enzyme-mimetic and Electrocatalytic Performances
Uniformly dispersed ultrafine platinum nanoparticles confined in a covalent organic framework (Pt/COF) has been designed and synthesized, which exhibit good catalytic activities in both enzyme-like and electrocatalytic catalysis. Benefiting from the space-confinement effect of pores in the COF matrix, the size of in-situ grown Pt nanoparticles is as small as 2.44 nm with a narrow size distribution. Owing to the structure superiority, the Pt/COF illustrates much better peroxidase/oxidase-like activity than unsupported Pt nanoparticles and physical mixture of the two components. Based on the inhibition of catalytic oxidation of peroxidase substrate by Pt/COF, a sensitive colorimetric method is established for tannic acid sensing. Furthermore, Pt/COF also exhibits better electrocatalytic activity and stability than commercial Pt/C catalyst towards methanol oxidation reaction (MOR). This work demonstrates the promising application potential of COF-supported materials in both enzyme-mimetic and electrocatalytic catalysis.