混成金銅鈀/多壁碳奈米管材料之合成與電催化特性研究

Synthesis of Hybrid AuCuPd/MWCNTs Material and Study its Electrocatalytic Properties

陳虹君(Hung-Chun Chen)

指導教授 ： 林鴻明

大同大學/工程學院/材料工程學系所/碩士(2012年)

摘要

本研究主要動機在於探討燃料電池中的陽極觸媒結構與電催化特性，合成新型奈米混成觸媒應用於甲酸燃料電池。為了避免觸媒被毒化的問題及改善增加其電催化活性，研究中以鈀金屬為主要催化劑，添加第二或三金屬以增加催化活性及減少鈀金屬在電催化反應中溶出之現象。本研究藉由多元醇法合成固溶三元合金相的金-銅-鈀觸媒，承載於具有高熱傳導性與高表面能之多壁碳奈米管，藉以添加銅去取代大部份的金。添加不同比例的金與銅再與鈀結合，合成奈米混成觸媒材料，使其形成三元金屬固溶相，以期降低成本，並提高催化的性能。研究探討合成觸媒的微觀結構、形貌與組成，並對甲酸電催化性能進行其特性與探討研究。
目前的結果顯示，5wt%金/5wt％銅/10wt％鈀/碳奈米管催化劑，在本研究中顯示出最佳的活性和穩定性。 AuCuPd 固溶體的可降低鈀浸出，同時防止鈀催化劑中毒。碳奈米管可以提供催化劑很好的支撐，以強化奈米AuCuPd 催化劑在甲酸電氧化活性和穩定。

關鍵字

固溶相三元金屬 ； 直接甲酸燃料電池 ； 甲酸 ； 金銅鈀 ； 多壁奈米碳管

並列摘要

The motivation of this study is to synthesis the novel nano hybrid catalysts and to investigate its structure and electro-catalytic properties for applications in direct formic acid fuel cells. In order to prevent the catalyst poison problem and improve electro-catalytic characteristics, which have develops of Pd based as the main catalysts, adding the second or third metals to increase the catalystic activity and to decrease the leaching of Pd in formic. The ternary solid solution of Au, Cu and Pd are supported by the high thermal conductivity and specific surface area of MWCNTs by polyol methods.
Adding different proportions of gold and copper combine with palladium to synthesize nano hybrid material in the form of ternary metal solid solution, in order to reduce costs and improve the catalytic performance. This study examines the microstructure, morphology, composition, and formic acid electro-catalytic performance of these synthesized catalysts.
According to the results of this study, [5wt%Au/5wt%Cu/10wt%Pd] /MWCNTs catalyst shows the best activity and stability. AuCuPd solid solution can prevent leaching and poisoning of Pd catalyst surface. MWCNTs is an excellent support for AuCuPd nanoparticles to enhance the formic acid electro-oxidation and stabilize the catalyst.

並列關鍵字

Multi-walled carbon nanotubes ； Gold/Copper/Palladium ； Solid solution of ternary metal. ； Formic acid ； Direct formic acid fuel cells

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