Abstract
Graphene was prepared by electrochemical reduction of exfoliated graphite oxide at cathodic potentials, and used to fabricate a graphene-modified glassy carbon electrode (GCE) which was applied in a sensor for highly sensitive and selective voltammetric determination of hydroquinone (HQ). Compared to a bare (conventional) GCE, the redox peak current for HQ in pH 5.7 acetate buffer solution is significantly increased, indicating that graphene possesses electrocatalytic activity towards HQ. In addition, the peak-to-peak separation is significantly improved. The modified electrode enables sensing of HQ without interference by catechol or resorcinol. Under optimal conditions, the sensor exhibits excellent performance for detecting HQ with a detection limit of 0.8 μM, a reproducibility of 2.5% (expressed as the RSD), and a recoveries from 98.4 to 101.2%.
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Acknowledgement
This work was supported by the Grants from the Natural Science Foundation of China (NSFC, No. 201105002), Anyang Technology Research Program (No 208) and Doctoral Fund for Initial Research of Anyang Normal University (No 308746).
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Li, SJ., Xing, Y. & Wang, GF. A graphene-based electrochemical sensor for sensitive and selective determination of hydroquinone. Microchim Acta 176, 163–168 (2012). https://doi.org/10.1007/s00604-011-0709-x
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DOI: https://doi.org/10.1007/s00604-011-0709-x