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In situ construction of hollow carbon spheres with N, Co, Fe co-doping as electrochemical sensor for simultaneous determination of dihydroxybenzene isomers

Abstract

Control of active site/center plays an important role in designing novel electrode materials with unusual properties and in obtaining sensors with high performance. In this study, three-dimensional (3D) freestanding multi-doped hollow carbon sphere (N-Co-Fe-HCS) with a layer thickness of 30 nm, which contain multiple active sites of heteroatom (N) and transition metals (Co and Fe), were synthesized via simple template method (SiO2 as a template) and cost-efficient in-situ self-polymerization, self-adsorption/reduction and carbonization strategies. Meanwhile, a series of hollow carbon sphere composites of the same family (N-HCS, N-Co-HCS and N-Fe-HCS) are prepared by this sensible process, using same method and precursor but different doping elements. These differences cause different active sites/centers from hollow carbon spheres and then electrocatalytic activities for dihydroxybenzene isomers. Furthermore, N-Co-Fe-HCS as electrochemical sensor has excellent simultaneous qualitative and quantitative performance for catechol (CC) and hydroquinone (HQ). The detection limit and linear range were 75 nmol L-1 and 0.5-500 μmol L-1 for CC, 80 nmol L-1 and 0.5-1500 μmol L-1 for HQ. The interference of the components coexisted in river water on the detection of CC and HQ were not observed. These results indicate that high performance electrochemical sensors could be constructed by in-situ multi-elements doping into electrode materials for multi-active sites.

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Publication details

The article was received on 05 Feb 2019, accepted on 05 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C9NR01146C
Citation: Nanoscale, 2019, Accepted Manuscript

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    In situ construction of hollow carbon spheres with N, Co, Fe co-doping as electrochemical sensor for simultaneous determination of dihydroxybenzene isomers

    H. yang, S. Li, H. Yu, F. Zheng, L. lin, J. Chen, Y. li and Y. Lin, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR01146C

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