Trimetallic Ag@Pt-Rh core-shell nanocubes modified anode for voltammetric sensing of dopamine and sulfanilamide. (15th February 2022)

• Record Type: Journal Article
• Authors: Zhang, Yun; Lv, Yunping; Chen, Yuning; Li, Yilin; Wang, Yingping; Zhao, Hong
• Is Part Of: Chemical engineering science. Volume 249(2022)
• Publication Date: 2022-02-15
• Subjects: Ag@Pt-Rh -- Core-shell nanocubes -- Dopamine -- Sulfanilamide -- Electrochemical sensor; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2021.117326
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: Trimetallic Ag@Pt-Rh core–shell NCs were synthesized by seeded overgrowth and co-titration method. The modified electrode exhibits accurate detection of dopamine and sulfanilamide in real water samples. Trimetallic nanocubes show fast electron transfer and enhanced electrochemical catalytic activity. Synergistic electronic and geometric effects of core–shell structure might be the main reason for sensitive detection. Abstract: Core-shell structured catalysts have attracted numerous attention due to their high utilization of metallic atoms, abundance of active sites, and high catalytic activity. Herein, Ag@Pt-Rh core–shell nanocubes were prepared by overgrowth of Pt-Rh on selective facets of Ag nanocubes via co-titration method for electrochemical detection of micropollutants such as dopamine (DA) and sulfanilamide (SA). The morphology and elemental distribution of Ag@Pt-Rh core–shell nanocubes were studied by TEM and high-resolution XPS. Results show that the Pt and Rh atoms were distributed uniformly on the surface of the Ag nanocubes. The electrochemical characterizations indicate that Ag@Pt-Rh NCs exhibited wide linear ranges of 0.2–512 µM with detection limits of 12 nM for determination of DA and a linear range of 2.6–320 μM with detection limits of 270 nM for monitoring SA. Thus, the Ag@Pt-Rh core–shell NCs may serve as a model for developing electrochemical sensors to monitor other biomolecules and pollutants.