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| 研究生： |
謝品安 Pin-An Hsieh |
|---|---|
| 論文名稱： |
摻鈀之二維鉍氧氯奈米片在二氧化碳還原上性能的影響 Effect of Doped Pd in 2D BiOCl Nanocatalysts on The Performance of CO2 Reduction |
| 指導教授： |
江偉宏
Wei-Hung Chiang 郭俊宏 Chun-Hung Kuo |
| 口試委員: |
江偉宏
Wei-Hung Chiang 郭俊宏 Chun-Hung Kuo 黃炳照 Bing-Joe Hwang |
| 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： | 2022 |
| 畢業學年度： | 110 |
| 語文別： | 英文 |
| 論文頁數： | 41 |
| 中文關鍵詞： | 鉍氧氯 、鈀 、二氧化碳還原 、電化學 、甲酸 、奈米 |
| 外文關鍵詞： | Bismuth oxychloride, palladium, CO2 reduction, electrochemistry, formate, nano |
| 相關次數： | 點閱：211 下載：3 |
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為解決越發嚴重的二氧化碳排放過量問題，我們研發出了一種在水相合成鉍氧氯和摻雜約百分之一鈀的鉍氧氯二維奈米片之濕式化學合成法來解決排放問題。結果顯示甲酸的法拉第效率在施加電位‒0.8到‒1.2 V之間呈現火山型的趨勢且在‒1.0 V擁有最高的效率。根據臨場X光繞射我們找出可能在二氧化碳還原路徑中反應在奈米片的中間體。在電位高於‒0.5 V時，鉍金屬的特徵峰從鉍氧氯中被還原出來。然而，從‒0.5到‒0.7 V的區間只得到非常低的法拉第效率，整體包含甲酸和氫氣在鉍氧氯和摻鈀鉍氧氯只得到分別為0到9.64%和0到16.36%。這篇論文呈現兩個事實，第一，零價的鉍原子提供了催化點位於產氫及二氧化碳還原甲酸生成。第二，鈀的存在降低了在工作電極和電解液的電子轉移障礙使產氫和二氧化碳還原更加容易進行。我們相信，優化二維催化劑為二氧化碳還原之重點。
For the increasingly serious problem of carbon dioxide (CO2) over emissions we developed the water-based wet-chemical method to synthesize 2D nanosheets of BiOCl and BiOCl-Pd where the Pd was about 1% to solve the CO2 emission issues. The results showed the Faraday efficiency of formate had a volcano trend from ‒0.8 to ‒1.2 V in both cases, and the highest value with the potential at the ‒1.0 V. By in-situ synchrotron XRD, we found the possible CO2RR pathway through capturing the intermediates generated on the nanosheets. It turned out that pure Bi metal peaks generated form reduction of BiOCl in the nanosheets higher than ‒0.5 V. However, the total F. E. obtained at ‒0.5 to ‒0.7 V were very low that the H2 gas and formate were generated from 0 to 9.46% for the BiOCl and to 16.36% for the BiOCl-Pd. This thesis implied two facts, first, the Bi0 atoms serve as the catalytic sites for hydrogen production reaction and CO2 reduction reaction to generate H2 gas and formate. Second, the existence of Pd reduces the barriers of charge transfer between the working electrodes and the electrolytes which makes the HER and CO2RR take place easily. We believe, there were the critical points to optimize the 2D catalysts for CO2RR.
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