Nanoporous gold film electrode: Preparation by alloying/dealloying approach and electrochemical performance

作者：Jia Fa Long^*; Luo Jian; He Yue; Zhang Li Zhi

来源：Chinese Journal of Inorganic Chemistry, 2007, 23(11): 1912-1916.

• dealloying
• nanoporous
• gold electrode
• methanol

Nanoporous gold film with pore size of similar to 15 nm was fabricated directly on the surface of gold by an alloying/dealloying process, involving the electrodeposition of Zn on gold surface, thermal treatment to form alloy layer, and chemical dealloying of Zn in the alloy. X-ray diffraction (XRD) results show the deposited Zn into An phase and an Au-Zn alloy layer formation during the alloying step. The morphologies of the samples were characterized by field emission scanning electron microscope (FESEM). It was observed that the thermal alloying condition had an obvious effect on the nanostrucuter of as-synthesized sample. Electrochemical tests indicate that the roughness of gold electrode is improved to about 65 after the gold electrode is treated by alloying/dealloying process. This nanoporous film gold electrode exhibits obviously high catalytic activity towards the oxidation of methanol. The oxidation current density of methanol was measured to be 2.02 mA (.) cm(-2) in KOH solution containing 0.3 mol (.) L-1 methanol.

• 出版日期2007-11
• 单位华中师范大学