The Electrocatalytic Study of Gold Dendrites for Fuel Cell Applications

• Main Authors: Hsin-Ting Chou, 鄒欣庭
• Other Authors: Wei-Hsiu Hung
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/86568254283750487816

碩士 === 國立臺灣師範大學 === 化學系 === 102 === Apart from the commercial polycrystalline gold electrode, we used pulsed current electrolysis to deposit gold dendrite showing well crystalline and three-order symmetry on the surface of the glassy carbon electrode (GC). And we used different deposition durations to prepare the gold electrodes (GD3000s, GD1500s, and NP500s). First, we carried out the reductive desorption of L-cysteine on gold electrodes prepared by different deposition times and commercial polycrystalline gold electrode in 0.5M KOH and desorbed the monolayer oxide on gold surface in 0.5M H2SO4. Following, we used the ratio: Q_a/Q_b to evaluate the effect of an Au(111) facet on the four different gold electrodes in electrocatalysis. We then performed the electrocatalysis reaction with methanol, ethanol, formic acid, and oxygen. Of all the electrodes tested, GD3000s showed the best performance in the electrocatalysis reaction with methanol, ethanol, and formic acid. However, due to its larger particle size, GD3000s exhibited poor electrocatalytic activity of oxygen reduction reaction. Finally, we prepared the silver dendrite on glassy carbon with good crystalline structure by the same means, in order to study the difference between gold dendrite and silver dendrite. Keyword: gold dendrites、methanol electro-oxidation、ethanol electro-oxidation、formic acid electro-oxidation、oxygen reduction、silver dendrites.