Formation of Porous Silver by Electrochemical Alloying/Dealloying in ZnCl2–EMIC Ionic Liquid

• Main Authors: Fu-Hwa Yeh, 葉馥華
• Other Authors: I-Wen Sun
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/61893751610512951613

碩士 === 國立成功大學 === 化學系碩博士班 === 94 === The porous silver surfaces have been fabricated conveniently by electrochemical alloying/dealloying of Ag-Zn alloy from a ZnCl2-EMIC ionic liquid at temperatures below 150°C without using any other corrosive acids or bases. The porous structure and surface morphologies of the porous silver films are dependent on the composition of the Ag-Zn surface, which in turn can be manipulated by the quantity of the zinc deposited on the silver surface, deposition potential, deposition current, and deposition/stripping temperature. The application of the fabricated porous Ag electrode was tested for the electrochemical reduction of chloroform to methane. At the same time, the electrochemical reduction process may contribute to an effective process for detoxification of chloroform. Compared to the polished Ag electrode, the porous Ag electrode has a much higher active surface area and is an effective electrode for the reduction of chloroform. Furthermore, because the Zn(II) species used in the deposition step returned back to the ionic liquid during the dealloying step, the composition of the ionic liquid is essentially unchanged and thus can be reused.