研究生: |
陳冠成 Guan-Cheng Chen |
---|---|
論文名稱: |
島型複合觸媒應用於陰離子交換膜水電解 Island-type hybrid catalysts applied for anion exchange membrane water electrolysis |
指導教授: |
王丞浩
Chen-Hao Wang |
口試委員: |
施劭儒
Shao-Ju Shih 楊永欽 Yung-Chin Yang 吳玉娟 Yu-Chuan Wu 邱德威 Te-Wei Chiu |
學位類別: |
博士 Doctor |
系所名稱: |
工程學院 - 材料科學與工程系 Department of Materials Science and Engineering |
論文出版年: | 2020 |
畢業學年度: | 108 |
語文別: | 中文 |
論文頁數: | 66 |
中文關鍵詞: | 水電解 、析氧反應 、非貴金屬觸媒 、島型複合觸媒 |
外文關鍵詞: | Water electrolysis, oxygen evolution reaction, non-precious metal catalyst, island-type hybrid catalysts |
相關次數: | 點閱:198 下載:0 |
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在本研究中,首先開發了一種快速,具有成本效益的方法來合成用於水電解的鈷鐵金屬氧化物催化劑。通過改變鈷和鐵的金屬比例,使用微波輔助水熱法合成了鈷鐵金屬氧化物催化劑。當鈷鐵比為2:1時,其電解池在10 mA cm-2處產生的起始電勢僅為1.56 V,接近熱力學可逆電勢。當電位為1.8 V時,其電流密度約為130 mA cm-2。穩定性測試的結果,在電壓為1.8 V連續16小時穩定性測試中,電流密度穩定保持為130 mA cm-2。
另一部分為了解決因氣體無法移除而堆積進而導致觸媒層崩散掉落的問題,故本實驗將嘗試製備出鐵-鈷特殊結構觸媒。此結構能改善在電解過程中,因氣體堆積在觸媒表面導致效能下降的現象以提高效能。在本計畫中,使用三氧化二鐵作為觸媒載體,在載體表面披覆一層觸媒,在不同的載體與鈷前驅物合成比例,得到最佳載體與前驅物比例。觸媒結構可由穿透式電子顯微鏡(TEM)得知,影像中顯示,在觸媒表面能明顯看出在觸媒與觸媒之間存在一小間隙,此間隙能讓水電解所產生的氣體更易移除與電解液補充,並藉由能量色散X-ray光譜(EDS-Mapping)可看出鈷元素均勻分布於載體表面。在這個計畫內,也進行全電池的組裝並進行測試。在進行長時間耐久性測試(200小時)後,其結果顯示電流密度和仍然保持在一開始的85%以上。
In this first work, a rapid, scalable, and cost-effective method was developed for synthesizing cobalt–iron metal oxide catalysts for water electrolysis. Cobalt-iron metal oxide catalysts were synthesized using the microwave-assisted hydrothermal methods by varying the molar ratios of cobalt and iron. When the cobalt to iron ratio was 2:1, its electrolytic cell yielded the onset potential of only 1.56 V at 10 mA cm-2, which is close to the thermodynamically reversible potential. When its cell potential was at 1.8 V, the cell current density was approximately 130 mA cm-2. The results of the stability test showed a steady-state cell current density of 130 mA cm-2 and remained constant for more than 16 h at a continuous cell potential of 1.8 V. Compared with other catalysts, cobalt–iron metal oxide catalysts showed lower overpotential and lower Tafel slope than did conventional precious metal catalysts such as PtO2 and IrO2. Cobalt-iron metal oxide catalysts serve as an inexpensive route to large-scale commercialization through facile synthesis for enhanced electrochemical water splitting.
Second work, this catalyst structure can be improved during the electrolysis process, because gas is accumulated in the catalyst, using Fe2O3 as the catalyst support materials, coating the cobalt catalyst on the support materials to be a catalyst. Fe2O3 support materials, and difference cobalt precursor ratio to find the best ratio in the water electrolysis catalyst. The transmission electron microscope (TEM) image shows that the catalyst surface structure can cleary to know. There is a small gap between the catalyst and the catalyst. This gap helps the gas produced by water electrolysis to be easier to remove. In this project, the assembly is also performed and test. After long-term testing (200 hours), the results show that the current density remains above 85%.
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