电极/反相微乳液体系电沉积制备纳米金镀层

将含有氯化金的强酸性水溶液作为水相与Triton X-100、正己醇、正己烷组成反相微乳液体系, 并以该微乳液构成电极/反相微乳液电极系统, 利用电沉积方法成功地制备出纳米Au镀层. 循环伏安和交流阻抗对反相微乳液体系电沉积过程的研究发现, 微乳液中Au(III)的还原为完全不可逆过程, 其电化学反应的阻抗值约为具有相同表观浓度氯化金水溶液体系的5.5倍. SEM研究结果表明, 利用微乳液体系电沉积获得的金镀层由纳米Au颗粒组成, 直径为50 nm左右. 所制备的纳米Au修饰电极由于具有较大的比表面积, 其电化学性能优于纯Au电极, 该电极在酸性条件下有较好的析氢性能, 在碱性条件对丙三醇有较好的电催化氧化性能.

Electrodeposition of Gold Nanoparticles Coatings from Electrode/Reverse Microemulsion System

Au nanoparticles coatings were successfully electrodeposited from an electrode/reverse microemulsion system using the reverse microemulsion composed of Triton X-100, n-hexanol, n-hexane and aqueous gold chloride solution with strong acitity. The electrodeposition process of Au was studied by cyclic voltammograms and electrochemical impedance spectroscopy. The results indicated that the reduction of Au(III) was a completely irreversible process, and the impedance of the electrochemical reaction in the microemulsion was 5.5 times as high as that in water solution. The scanning electron microscopy images showed that the coatings electrodeposited from the reverse microemulsions were made up of gold nanoparticles with diameter about 50 nm. Due to the large specific surface area, the electrochemical reaction activity of the Au nanoparticles modified electrode was higher than that of the pure gold electrode, the Au nanoparticles modified electrode had good hydrogen evolution capability in acid solution and good electrocatalytic capability for glycerol oxidation in alkaline media.