Electrochemical study on cobalt film modified glassy carbon electrode and its application

✍ Scribed by Li Tian; Jiangyu Bian; Binbin Wang; Yanjuan Qi

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 560 KB
• Volume: 55
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2010.01.077

✦ Synopsis

A novel electroactive material for ascorbic acid (AA) determination was successfully prepared by plating/potential cycling method. The cobalt film was first deposited on the surface of glassy carbon electrode (GCE) in CoSO 4 solution by potential cycling, and then a cobalt film on the surface of GCE was activated by potential cycling in 0.1 mol L -1 NaOH. The electrochemical performance of the resulted film (Co/GCE) and factors affecting its electrochemical activity were investigated by cyclic voltammetry and amperometry. This film electrode exhibited good electrocatalytic activity to the oxidation of AA. This biosensor had a fast response of AA less than 3 s and excellent linear relationships were obtained in the concentration range of 3 × 10 -7 to 1 × 10 -4 mol L -1 with a detection limit of 2 × 10 -7 mol L -1 (S/N = 3) under the optimum conditions. Moreover, the selectivity, stability and reproducibility of this biosensor were evaluated with satisfactory results.