期刊
MICROCHIMICA ACTA
卷 176, 期 1-2, 页码 163-168出版社
SPRINGER WIEN
DOI: 10.1007/s00604-011-0709-x
关键词
Electrochemical reduction; Graphene-modified electrode; Hydroquinone; Electrocatalytic; Selectivity
资金
- Natural Science Foundation of China (NSFC) [201105002]
- Anyang Technology Research Program [208]
- Anyang Normal University [308746]
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 mu M, a reproducibility of 2.5% (expressed as the RSD), and a recoveries from 98.4 to 101.2%.
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