Flexible Electrochemical Sensor Constructed Using an Active Copper Center Instead of Unstable Molybdenum Carbide for Simultaneous Detection of Toxic Catechol and Hydroquinone

Zuo, Jiabao; Shen, Ying; Wang, Luyao; Yang, Qi; Cao, Zheng; Song, Haiou; Z, Ye; Zhang, Shupeng

doi:10.2139/ssrn.4313059

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“…This result is in accordance with the above conclusion that the two electrons and two protons are involved in the redox processes of HQ and CC. 50 In order to better understand the electrocatalytic performance of catalysts loaded with Cu SAs on analytes, density functional theory (DFT) calculations are performed to further understand the role of Cu SAs at the atomic level. As compared to the cases of N-CSs that are −0.59 and −0.61 eV, Cu SAs/N-CSs exhibit stronger adsorption strength and more effective affinity for CC and HQ, thus improving the electrocatalytic and sensing performance of CC and HQ.…”

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confidence: 99%

Cu Single Atoms Embedded in N-Doped Hollow Carbon Spheres for Simultaneous Electrochemical Detection of Hydroquinone and Catechol

Yuan,

Jin,

Guo

et al. 2024

ACS Appl. Nano Mater.

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N-doped hollow carbon spheres loaded with Cu single atoms (Cu SAs/N-CSs) were prepared via an in situ hardtemplate method. As an electrode catalyst, the Cu SAs/N-CSs electrochemical-sensing properties to hydroquinone (HQ) and catechol (CC) were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), and the linear detection ranges of HQ and CC were 1−324 and 1−123 μM, respectively; the detection limits are 0.33 and 0.17 μM, respectively. The experimental and DFT calculation results show that Cu SAs/N-CSs have stronger adsorption strength and more effective affinity for CC and HQ due to the synergistic effect of dispersed Cu SAs and N-CSs, thus improving the electrocatalytic and sensing properties of CC and HQ. Furthermore, the prepared electrode has been successfully applied to the simultaneous determination of HQ and CC in practical water samples with satisfactory results.

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confidence: 99%