Zhang Li, Han Chaoqin, Zhang Pu, Fu Wensheng, Nie Yao, Wang Yi
Chongqing Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, P. R. China.
Chongqing Research Center for Pharmaceutical Engineering, College of Pharmacy, Chongqing Medical University, Chongqing 400016, China.
Nanoscale. 2021 Nov 18;13(44):18665-18676. doi: 10.1039/d1nr05336a.
Uniformly dispersed ultrafine platinum nanoparticles confined in a covalent organic framework (Pt/COF) have 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 grown Pt nanoparticles is as small as 2.44 nm with a narrow size distribution. Owing to the structure superiority, the Pt/COF catalyst exhibits much better peroxidase/oxidase-like activity than unsupported Pt nanoparticles and a physical mixture of the two components. Based on the inhibition of catalytic oxidation of the peroxidase substrate by Pt/COF, a sensitive colorimetric method is established for tannic acid sensing. Furthermore, the Pt/COF catalyst also exhibits better electrocatalytic activity and stability than commercial Pt/C catalyst towards the methanol oxidation reaction (MOR). This work demonstrates the promising application potential of COF-supported materials in both enzyme-mimetic and electrocatalytic catalysis.
已设计并合成出均匀分散在共价有机框架（Pt/COF）中的超细微铂纳米颗粒，其在类酶催化和电催化中均表现出良好的催化活性。受益于COF基质中孔的空间限制效应，生长的铂纳米颗粒尺寸小至2.44 nm，尺寸分布窄。由于结构优势，Pt/COF催化剂比无载体铂纳米颗粒以及这两种组分的物理混合物表现出更好的过氧化物酶/氧化酶样活性。基于Pt/COF对过氧化物酶底物催化氧化的抑制作用，建立了一种用于单宁酸传感的灵敏比色法。此外，Pt/COF催化剂在甲醇氧化反应（MOR）中也比商业Pt/C催化剂表现出更好的电催化活性和稳定性。这项工作证明了COF负载材料在模拟酶催化和电催化中的应用潜力巨大。
