Three-dimensional CeO2 Nanosheets/CuO nanoflowers p-n heterostructure supported on carbon cloth as electrochemical sensor for sensitive nitrite detection

IF 5.7 2区 化学 Q1 CHEMISTRY, ANALYTICAL
Jingwen Zhang, Haoyu Jiang, Jie Gao, Chun Zhao, Hui Suo
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引用次数: 0

Abstract

Background

Nitrite is widely used as a food additive, and it is of great significance to realize accurate detection of nitrite for food safety. Electrochemical technique is characterized by simple operation and portability, which enables rapid and accurate detection. The key factors affecting the nitrite detection performance are the electrocatalytic activity and interfacial electron transfer efficiency of the electrode. The electrochemical oxidation of nitrite typically requires high potentials, posing challenges for detection. Therefore, we need to develop a high-performance sensitive electrode to fulfill the need for efficient detection of nitrite. (89)

Results

We designed a novel CeO2 nanosheets/CuO nanoflowers p-n heterostructure supported on carbon cloth, which was used to construct an electrochemical sensor for nitrite. The p-CuO NFs/n-CeO2 NSs heterojunction produced charge transfer effects and strong electronic interactions, which contributed to the increase in oxygen vacancies and enhanced the electrocatalytic activity. During electrochemical oxidation of nitrite, the p-n heterojunction achieved more efficient carrier separation, increasing the number of free electrons in the conduction band and facilitating charge transport. The electrode combines CuO nanoflowers with labyrinthine CeO2 nanosheets, significantly enhancing the electrochemically active surface area and availability of active sites, improving electron conduction efficiency and mass transfer efficiency. The CeO2 NSs/CuO NFs/CC showed significantly enhanced current response for the oxidation of nitrite, such as the sensitivity of 11610 μA mM−1cm−2, the linear determination range of 0.1–4000 μM, the LOD of 0.037 μM (S/N = 3). (143)

Significance

This work combines binary metal oxide p-n heterojunction with three-dimensional morphology optimization to design sensitive electrode with enhanced nitrite sensing performance, reduced oxidation potential and improved sensitivity. And the prepared electrode can rapidly and accurately detect nitrite residues in food samples. This work provides a high-performance nitrite electrochemical sensing platform with great practical applications. (54)

Abstract Image

Abstract Image

碳布负载的三维CeO2纳米片/CuO纳米花p-n异质结构作为亚硝酸盐敏感检测的电化学传感器
背景亚硝酸盐作为一种广泛使用的食品添加剂,实现亚硝酸盐的准确检测对食品安全具有重要意义。电化学技术具有操作简单、便携等特点,可实现快速、准确的检测。影响亚硝酸盐检测性能的关键因素是电极的电催化活性和界面电子转移效率。亚硝酸盐的电化学氧化通常需要高电位,这给检测带来了挑战。因此,我们需要开发一种高性能的灵敏电极来满足亚硝酸盐高效检测的需要。(89)结果设计了一种新型碳布负载的CeO2纳米片/CuO纳米花p-n异质结构,用于构建亚硝酸盐电化学传感器。p-CuO NFs/n-CeO2 NSs异质结产生电荷转移效应和强电子相互作用,导致氧空位增加,电催化活性增强。在亚硝酸盐的电化学氧化过程中,p-n异质结实现了更有效的载流子分离,增加了导带中自由电子的数量,促进了电荷的传输。该电极将CuO纳米花与迷宫式CeO2纳米片结合,显著提高了电化学活性表面积和活性位点的可用性,提高了电子传导效率和传质效率。CeO2 NSs/CuO NFs/CC对亚硝酸盐氧化的电流响应显著增强,灵敏度为11610 μA mM−1cm−2,线性测定范围为0.1 ~ 4000 μM, LOD为0.037 μM (S/N=3)。(143)意义:本文将二元金属氧化物p-n异质结与三维形貌优化相结合,设计了具有增强亚硝酸盐传感性能、降低氧化电位和提高灵敏度的敏感电极。所制备的电极可以快速准确地检测食品样品中的亚硝酸盐残留。本工作提供了一种具有实际应用价值的高性能亚硝酸盐电化学传感平台。(54)
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来源期刊
Analytica Chimica Acta
Analytica Chimica Acta 化学-分析化学
CiteScore
10.40
自引率
6.50%
发文量
1081
审稿时长
38 days
期刊介绍: Analytica Chimica Acta has an open access mirror journal Analytica Chimica Acta: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Analytica Chimica Acta provides a forum for the rapid publication of original research, and critical, comprehensive reviews dealing with all aspects of fundamental and applied modern analytical chemistry. The journal welcomes the submission of research papers which report studies concerning the development of new and significant analytical methodologies. In determining the suitability of submitted articles for publication, particular scrutiny will be placed on the degree of novelty and impact of the research and the extent to which it adds to the existing body of knowledge in analytical chemistry.
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