研究生: |
李桂銓 Quei-cyuan Li |
---|---|
論文名稱: |
金與金鉑雙金屬奈米顆粒製備以及其CO氧化電極反應的活性分析 The Preparation of Au and AuPt Bimetallic Nanoparticles for Electrochemical CO Oxidation |
指導教授: |
林昇佃
Shawn D. Lin |
口試委員: |
黃炳照
Bing-Joe Hwang 林修正 Andrew Lin |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2010 |
畢業學年度: | 98 |
語文別: | 中文 |
論文頁數: | 137 |
中文關鍵詞: | 旋轉圓盤電極 、奈米金 、電催化一氧化碳 |
外文關鍵詞: | gold nanoparticles, RDE, CO oxidation |
相關次數: | 點閱:581 下載:7 |
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本研究修改實驗室先前的甲醇檸檬酸鈉製備金奈米顆粒的方法,改為用丙酮二羧酸或硼氫化鈉兩種更強的還原劑來取代甲醇,或添加鹼性溶液改變反應環境pH值,以製備粒徑更小的金奈米顆粒,之後加入氯鉑酸製備鉑修飾的金奈米顆粒,並以室溫下自發氧化還原或通入氫氣,使鉑還原於金奈米顆粒表面,研究中探討不同大小或形狀的金奈米顆粒,與鉑改質的金鉑雙金屬奈米顆粒對CO氧化反應的影響。TEM分析顯示添加4 mM硼氫化鈉於檸檬酸鈉系統可得5.1 nm的金顆粒,添加3 mM氨水於硼氫化鈉系統中可得規則聯網奈米結構金,室溫下以氫氣還原氯鉑酸於5.1 nm金顆粒也可得連網狀雙金屬觸媒,經UV-vis、ICP與XPS分析顯示以上觸媒大部分前驅物已還原為零價的金或鉑金屬。在25 ℃、1.0 M過氯酸電解質中,金奈米顆粒在0.4~0.6 V有CO-stripping信號,顯示金表面吸附相CO在該電位下可被氧化為CO2,鉑的改質能提早氧化吸附相CO或在0.85~1.2 V有類似單純鉑的CO氧化峰,而溶液相CO氧化實驗顯示鉑的改質除了造成溶液相CO氧化電位提早,氧化電流密度也有所提升,塔弗斜率也變小,可見鉑修飾金的奈米觸媒可能具有改善燃料電池陽極受CO毒化問題的潛力。
This study prepared Au and Pt-deposited Au nanoparticles and their electrochemical CO oxidation activities. Dicarboxy acetone, NaBH4, or alkaline solutions was used to control the prepared gold nanoparticles size when sodium was used as the stabilizer. The Pt deposition was carried out by adding H2PtCl6 at 298K via hydrogen-reduction or spontaneous galvanic reduction over the preformed Au sol.
TEM analysis indicated that Au of 5.1 nm size was obtained by adding 4 mM NaBH4 to the sodium citrate system, that cross-linked Au nanostructure was found when adding 3 mM NH4OH to the NaBH4 system, and that cross-linked Au-Pt nanostructure was found by hydrogen reductuion of H2PtCl6 in the present of 5.1 nm Au sol. By UV-vis, ICP, and XPS analysis, almost all of used precursors were reduced during preparation.
CO-stripping experiment indicated gold nanoparticles can oxidize adsorbed CO to CO2 at 0.4~0.6 V at 25℃ and 1.0 M perchloric acid solution. The Pt-deposited Au nanoparticles show better CO oxidation activity than gold nanoparticles, as indicated by a lower onset potential during CO-stripping experiment and a lower Tafel slope during CO-CV experiment. The results of this study indicated that Pt deposition can improve the electrochemical activities of Au catalysts for CO oxidation reaction in acidic electrolyte.
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