▎ 摘　　要

Developing excellent electrochemical sensors for the determination of pollutants in the environment is crucial to advances of human detection technology. In this work, Ni/N-doped graphene oxide (Ni/N-GO) composite was constructed as an electrochemical sensor (Ni/N-GO/GCE) for the selective determination of catechol (CC) and hydroquinone (HQ). Thereinto, the Ni/N-GO composite was prepared by a high-temperature thermal reduction method. Also, a series of characterizations and electrochemical measurements were used to research the electrochemical properties of Ni/N-GO/GCE to detect CC and HQ. Furthermore, the oxidation peak potentials of CC and HQ on Ni/N-GO/GCE were 0.07 and 0.17 V, respectively, allowing selective detection of HQ and CC. Ni/N-GO/GCE exhibited linear responses toward CC and HQ in the concentration ranges of 1.4 similar to 800 and 1.0 similar to 800 mu M, respectively. Besides, the detection limits were calculated as 0.06 and 0.16 mu M (S/N = 3) through differential pulse voltammetry, respectively. Under optimized experimental conditions, the electrochemical sensor revealed excellent catalytic performance for the redox of CC and HQ. Finally, the results showed that Ni/N-GO/GCE was a promising electrode with superb long-term stability and reproducibility for the determination of hydroquinone isomers.