▎ 摘　　要

In this article, graphite oxide (GO) and graphene have been prepared by chemical method and applied to modify electrodes in electrochemical detection of hydroquinone and ascorbic acid (AA). It is confirmed that the as-prepared GO- and graphene-modified electrodes own good electro-sensitivity for detecting hydroquinone and AA by cyclic voltammogram measurements. The detection limit of hydroquinone on graphene electrode was 3.8 x 10(-7) mol L-1 (S/N = 3). Graphene has lowered the over-potential of hydroquinone and improved its electrochemical reversibility. The redox process of hydroquinone is more prone to be diffusion-controlled, as shown by the relationship between anodic peak currents and scan rate results. Different from hydroquinone detecting, both GO- and graphene-modified electrodes have favourable oxidation peaks in detecting AA, as the oxygen content sites on GO and graphene have been tested to be the electro-active sites for AA detecting. The redox process of AA on GO- and graphene-modified electrodes is more prone to be absorption-controlled. The results presented in this article demonstrate that GO and graphene have a good prospect in the making of an AA sensor device.