Fabrication of Nanoporous Gold Film Electrodes with Ultrahigh Surface Area and Electrochemical Activity
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- 作者：Falong Jia ; Chuanfang Yu ; Zhihui Ai ; Lizhi Zhang
- 刊名：Chemistry of Materials
- 出版年：2007
- 出版时间：July 24, 2007
- 年：2007
- 卷：19
- 期：15
- 页码：3648 - 3653
- 全文大小：365K
- 年卷期：v.19,no.15(July 24, 2007)
- ISSN：1520-5002
文摘
Nanoporous gold film (NPGF) electrode was fabricated by applying multicyclic potential scans on apolished gold electrode in an electrolyte composed of ZnCl2 and benzyl alcohol. In the cathodic potentialscan, Zn was first electrodeposited on the gold electrode surface, and Au-Zn alloy was then directlyformed on the surface under an elevated temperature. In the subsequent anodic potential scan, dealloyingof Zn took place, resulting in a nanostructured gold film. Furthermore, Zn was then electrodepositedonto the porous gold surface and a Au-Zn alloy was formed at the same time. Through controlling theparameters of cyclic voltammetry and cyclic times, we finally obtained a three-dimensional NPGF withnanopores. The resulting NPGF possessed ultrahigh roughness factor and surface area. Results showedthat the electrochemical activity of the NPGF electrode was much higher than that of the polished goldelectrode. We believe that the resulting NPGF electrode is promising in the fields of catalysis, sensors,and so on. Meanwhile, this multicyclic electrochemical alloying/dealloying method may be applied tofabricate other nanoporous metal films.