Mesoporous Core–Shell Pd@Pt Nanospheres as Oxidase Mimics with Superhigh Catalytic Efficiency at Room Temperature

作者：Jingyun Zhang, Yajun Zhong, Chunyan Zhang, Junyu Zhang, Zhenjing Zhuang · 发表于：The Journal of Physical Chemistry Letters · 年份：2022 · DOI：10.1021/acs.jpclett.1c03921 · 被引用次数：21 · 研究领域：Advanced Nanomaterials in Catalysis、Electrochemical sensors and biosensors、Advanced biosensing and bioanalysis techniques

Mesoporous Pt–Pd bimetallic core–shell nanospheres (mPd@Pt NSs) with palladium-rich cores and platinum-rich shells were synthesized via a simple, two-step, wet chemical strategy mediated by nitrogen-doped carbon dots. The BET surface area of mPd@Pt NSs was found to be 210.4 m 2 ·g –1, which is significantly higher than the currently reported unsupported Pt-based nanomaterials. Because of the large active surface area, the as-prepared mPd@Pt NSs show superhigh oxidase activity and exhibit excellent oxidase-like catalytic efficiency with a catalytic constant ( K cat ) as high as 2.1 × 10 3 s –1 at room temperature, which is of the same order of magnitude as the natural horseradish peroxidase (HRP) ( K cat = 4.3 × 10 3 s –1 ) at 37 °C and five-fold greater than the reported K cat values of oxidase-like nanozyme obtained at 30 °C.