研究生: |
張家銘 Chang Chia-Ming |
---|---|
論文名稱: |
氧化鈰修飾的燃料電池鉑釕陽極觸媒 Modification of Active Carbon Supported Platinum-Ruthenium (PtRu/C) with Cerium Oxide for DMFC Anode Catalysts |
指導教授: |
葉君棣
Yeh Chuin-Tih |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 化學系 Department of Chemistry |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 75 |
中文關鍵詞: | 燃料電池 、觸媒 |
外文關鍵詞: | DMFC, catalysts |
相關次數: | 點閱:1 下載:0 |
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本研究是針對PtRu/C觸媒進行改質,希望提高其活性藉以降低金屬的用量。在此實驗中選擇添加CeO2以增加觸媒的分散度及提高觸媒的電化學活性,將製備好的觸媒以XRD和TEM來分析樣品的顆粒大小及分散情況,並利用TPR來了解金屬觸媒與載體之間的作用力,最後以CV測試電化學氧化甲醇的活性。
添加CeO2後的PtRu/CeC觸媒從TEM的觀察發現其金屬與CeO2容易一起聚集沉積於碳黑上,且在XRD中原本屬於PtRu合金的繞射特徵鋒消失偵測不到,推測是由於CeO2與PtRu間的作用力增加了PtRu的分散度。而在CV氧化甲醇的活性測試發現PtRu/CeC觸媒比PtRu/C能產生更高的電流,在0.5 V(vs SHE)的電流密度(I0.5)是PtRu/C觸媒的4倍。
此外本研究還討論了以沉澱沉積法(deposition precipitation, DP)、含浸沉澱法(impregnation precipitation, IP)和連續沉澱法(sequential precipitation, SP)三種方法製備PtRu/CeC觸媒,發現以DP法製備之觸媒PtRu與CeO2能形成較強的作用力,並且PtRu與CeO2大部分的比例是沉澱於碳黑的表面,因此其電化學活性是三種製備方法之觸媒活性最佳的。
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