复合数
电化学
吸附
纳米颗粒
煅烧
材料科学
检出限
亚硝酸盐
碳纤维
电化学气体传感器
化学工程
纳米复合材料
热稳定性
安培法
纳米技术
复合材料
化学
电极
色谱法
催化作用
硝酸盐
有机化学
物理化学
工程类
作者
Luo Li,Qianqian Xu,Kan-Kan Chen,Zhong-Gang Liu,Zheng Guo
标识
DOI:10.1016/j.snb.2023.133488
摘要
Long-term accumulation and overdose of nitrite have been proven to be an enormous threat to the ecosystems and human beings. Hence, it is of great significance to accurately evaluate nitrite by a simple and stable method. In this manuscript, Fe2O3/Fe3C/Fe composite nanoparticles uniformly decorated on carbon spheres (CSs@Fe2O3/Fe3C/Fe) have been developed to fabricate an electrochemical sensor for the determination of nitrite. Through in-situ thermal oxidation and reduction route, Fe3+ adsorbed on carbonaceous spheres were in-situ transformed into Fe2O3/Fe3C/Fe composite nanoparticles on their surfaces. Based on the composition evolution with the calcined temperature, their forming mechanism was explored. Due to the synergetic effect of the adsorption/acceleration of carbon spheres (CSs) and the electrocatalytic activity of the composite nanoparticles, CSs@Fe2O3/Fe3C/Fe modified GCE exhibits an excellent electrochemical sensing performance toward nitrite with a high sensitivity of 451.85 µA cm−2 mM−1, a low detection limit of 0.06 µM and a wide linear range (1–2540 μM). Furthermore, it also shows a good selectivity and stability toward nitrite. In addition, the proposed sensor was employed to evaluate the nitrite level in different pickled vegetables. The results indicate that it is a good potential application to detect nitrite in real samples.
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