研究生: |
謝俊彥 Chun-yen Hsieh |
---|---|
論文名稱: |
金修飾對鉑奈米顆粒電催化一氧化碳與甲醇氧化反應的影響 Gold-decorated Platinum Nano-particles for Electrochemical CO and Methanol Oxidation |
指導教授: |
林昇佃
Shawn D-LIn |
口試委員: |
林修正
none 周宏隆 none |
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: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 100 |
中文關鍵詞: | 一氧化炭剝除實驗 、甲醇剝除實驗 、鉑與鉑金奈米顆粒 |
外文關鍵詞: | CO-stripping, MeOH-stripping, PtAu |
相關次數: | 點閱:181 下載:2 |
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本研究以實驗室先前開發的甲醇檸檬酸鈉製備鉑奈米顆粒溶膠(Pt-sol)用AuCl3(aq)進行自發還原修飾鉑奈米顆粒表面,並探討金的添加環境與不同添加量對燃料電池陽極一氧化碳毒化現象與甲醇氧化反應的穩定性。以甲醇檸檬酸鈉製備方法製作3~4 nm的Pt奈米顆粒,再分別於室溫下以空氣與氫氣環境下添加不同量的AuCl3(aq),經過攪拌2小時可製備出約4~6 nm的PtAu雙金觸媒。在XRD分析中發現d-spacing有隨金添加量增加有增加的趨勢,氫氣環境下製備略大於氫氣環境下製備的樣品,可推論添加金有改變鉑顆粒表面的型態,且有合金的結構。電化學實驗分析結果顯示,CO-Stripping實驗450mV吸附條件下0.1ML金添加量有助CO氧化。MeOH-Stripping 實驗難氧化峰與CO-Stripping200mV下吸附物種氧化峰相近推論為HCO。MeOH-CV實驗發現添加金修飾鉑奈米顆粒溶膠可以降低MOR反應中的比活性的毒化現象,金的修飾量超過1ML以上甲醇比活性大幅減少,但並無法減少活性面積下降的毒化現象。
Platinum nano-particles of 3-4 nm were modified by spontaneous deposition of submonolayer gold. The effects of Au on the activites and the stability of Au-decorated Pt nano-particles were examined for the anodic MeOH and CO oxidation reactions.
The spontaneous deposition of AuCl3 was carried out at 298K in the methanol-citrate system containing preformed Pt-sol under air or under hydrogen. XRD analysis indicated that the d-spacing of Pt increased with Au, indicating of PtAu alloy formation the obtained PtAu nanoparticals are all of 4-6 nm size from TEM and XRD data.
Electrochemical analysis indicated that the PtAu showed improved CO oxidation activity than unmodified Pt sols ,When CO adsorbed at 0.45V .The MeOH stripping experiment, suggest that adsorbed MeOH dehydrogenated to HCO species which then oxidation at the same potential as the CO adsorbed at 0.2V in CO-stripping experiment .Au modified increased activity of MeOH oxidation but irreversible poisoning remained. At a Au loading of 0.1ML(monolayer) over Pt, the specific activity for MORwas the highest .
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