奈米Au-Pd/CeO2/MWCNTs混成材料之合成與特性研究

Synthesis and Characterization of Au-Pd/CeO2/MWCNTs Hybrid Materials

劉俊毅(Jyun-Yi Liu)

指導教授 ： 林鴻明

大同大學/工程學院/材料工程學系所/碩士(2011年)

摘要

近年來，直接甲酸燃料電池(DFAFCs)引起了廣泛的關注，而陽極催化劑的研究是DFAFC 研究的關鍵。本文以多壁納米碳管為載體，合成了固溶相雙金屬(金與鈀)與金屬氧化物(二氧化鈰)的觸媒系統，並對它們的結構、形貌、特性分析和對甲酸氧化的電催化性能進行了研究。
本實驗以固溶雙金屬與金屬氧化物修飾載體的觸媒，藉此期望能加強觸媒的催化效應，在研究當中也證實固溶雙金屬形成有助於改善觸媒特性，而添加金屬氧化物可使材料有不同的表現。
在研究過程中，對於催化劑的合成，我們期望添加二氧化鈰可以有更優異的觸媒特性。利用X 光射線繞射儀分析，鑑定合成之奈米混成觸媒材料之結構；熱重分析儀用來決定金屬觸媒在合成材料中的重量比例；熱場發射掃描式電子顯微鏡可觀察其顯微形貌；高解析度穿透式電子顯微鏡以解析材料之型態與奈米金屬觸媒顆粒的尺寸；比表面積分析儀測定觸媒材料之比表面積大小；熱程控脫附儀觀察觸媒脫附特性；在電化學氧化反應的試驗中，以循環伏安法來分析觸媒材料在甲酸電解液進行氧化還原時的特性；CO 氧化測試來評估觸媒之活性，藉此說明應用於燃料電池毒化現象。

關鍵字

甲酸 ； 固溶相雙金屬 ； 多壁奈米碳管 ； 直接甲酸燃料電池 ； 二氧化鈰

並列摘要

Recently, direct formic acid fuel cells (DFAFCs) have attracted considerable attention. The research on anode catalysts for formic acid oxidation is crucial for the development of DFAFCs. In this thesis, we prepared Au-Pd and Pd-based alloy catalysts supported on multi-walled carbon nanotubes (MWCNTs). Their structures, morphologies, characterization and electrocatalytic properties for formic acid oxidation was investigated. The main results obtained are as follows：
In this study, bimetal solid solution and metal oxide modified catalyst supports, to look forward to enhance the catalytic properties of catalyst. In the study also confirmed the formation of bimetallic solid solutions help to improve the catalyst properties, and adding metal oxide materials can have different performance.
In the course of the study, for the catalyst synthesis, we look forward to adding cerium oxide catalyst can have more excellent features. The structures of nano hybrid catalysts are analyzed by X-ray diffraction (XRD) patterns. Thermogravimetry Analyzer (TGA) is used to determine the contents of metal catalyst in the nano hybrid materials. Field-emission scanning electron microscope (FESEM) and high resolution transmission electron microscope (HRTEM) are applied to observe the morphologies, BET surface area analyzer to evaluate the materials properties, TPD experiment is carried out to examine the characteristics of the catalysts. In the electrochemical oxidation experiment, cyclic voltammetry analyze the redox properties of catalyst material in acid electrolyte. CO oxidation tests will be executed to examine the catalytic activity of catalysts to study the reaction mechanisms of catalysts that can be interpreted the poison effects on the catalysts in application of fuel cell.

並列關鍵字

Bimetal solid solution ； Multi-walled carbon nanotubes ； Direct formic acid fuel cell ； Formic acid ； Ceria

參考文獻

[50] Jia-Wen Hu, Yong Zhang, Jian-Feng Li, Zheng Liu, Bin Ren, Shi-Gang Sun,

[32] S. Ha, R. Larsen, R.I. Masel, “Performance Characterization of Pd/C

[35] Cheng-Han Chen, Wei-Jen Liou, Hong-Ming Lin, She-Huang Wu, Anna

[12] Xiangyang Zhou, Jamie Weston, Elena Chalkova, Michael A. Hofmann,

[59] C. Y. Huang, I. J. Chiang, J. C. Huang and S. R. Sheen, Nanostructured Materials, volume 10, 1998, page 1393.