标题：Facile method for fabrication of self-supporting nanoporous gold electrodes via cyclic voltammetry in ethylene glycol, and their application to the electrooxidative determination of catechol
作者：Lu, Lu; Huang, Xirong; Dong, Yanjie; Huang, Yu; Pan, Xinmeng; Wang, Xingyue; Feng, Miao; Luo, Yun; Fang, Duowen
作者机构：[Lu, Lu; Dong, Yanjie; Huang, Yu; Pan, Xinmeng; Wang, Xingyue; Feng, Miao; Luo, Yun; Fang, Duowen] Anqing Normal Univ, Sch Chem & Chem Engn, Anqing 24 更多
通讯作者地址：[Lu, L]Anqing Normal Univ, Sch Chem & Chem Engn, Anqing 246011, Peoples R China.
关键词：Nanoporous gold; Ethylene glycol; Solvent effect; Electrochemical; alloying and dealloying; Catechol
摘要：A method is described for in-situ electrochemical preparation of nanoporous gold electrodes (np-GEs) via alloying and dealloying using ethylene glycol (EG) as a solvent. The np-GEs were prepared via cyclic voltammetry from a gold electrode in the presence of ZnCl2 in EG. Effects of temperature, number of scan cycles and scan rate were investigated. It is concluded that the process involves formation of interfacial elemental zinc and the formation of a gold-zinc alloy. At a temperature of 120 A degrees C, the alloy is formed already after the first scan cycle, and ten further cycles do not cause substantial further changes in the morphology. Changes in the morphology were corroborated by data on the electroactivity of the np-GEs. The mechanism of the formation of np-GEs in EG obviously is different from that in other solvents due to the superior smoothing ability of EG for electroplating. This results in more uniform alloy layers and in a more evenly distributed porous structure. The self-supporting np-GE without any further modification displays an amperometric response to catechol (at a working voltage of 420 mV vs. SCE) in the 0.050 to 1.0 mM concentration range, with a detection limit of 1.78 mu M (at an S/N of 3), indicating that the np-GE can be applied to convenient and effective determination of catechol.