- 學位論文
光催化奈米結構光觸媒產生微米氫氣泡
Micro Hydrogen Bubbles Generation by Nano-Photocatalysis
摘要
太陽能是一個無汙染、便宜且能夠永續發展的乾淨能源，然而使用太陽能並非容易，如何使用太陽能變成關鍵的議題。儲存太陽能的方法有許多，其中將其轉換成氫能保存利用是其中一個已經被實際應用的方式。氫能的產生勢必夾帶著如何儲存的問題，目前市面上常見的氫能儲存機制都是需要高壓低溫的環境。 其中，光觸媒產氫是利用半導體，電子電洞對分離的機制，進行氧化還原反應將溶液還原得到氫氣，而過程中不會產生任何溫室氣體及汙染物。奈米氣泡在近幾年被研究得知能長時間存活，且由Young-Laplace equation可得知越小的氣泡其內壓越大，因此若利用光催化的方式產生氫氣，且氫氣是以奈米氣泡的形式呈現，由奈米氣泡長時間存活理論便能將氫氣有效儲存。 本研究著重於如何利用光催化產生大量且均勻可脫離表面的微米氫氣泡，由研究可得知若將光觸媒進行表面修飾，使其表面疏水，且在溶液中加入界面活性劑，便能產生尺寸均勻地微米氣泡，並搭配使用超音波震盪，使氫氣泡脫離催化劑試片的表面。
並列摘要
Sunlight is a non-polluting, inexpensive, and endlessly renewable source of clean energy, however, it can hardly be applied freely in demand. As a result, to store solar energy into another energy forms, such as hydrogen, is a more practical way for real applications. But hydrogen storage is a big problem in hydrogen application. We know that the current hydrogen storage mechanism requires low temperatures and high-pressure conditions. Among them, photocatalytic reactions based on electron-hole pair production in semiconductors can generate hydrogen without any CO2 or other pollution produced. It is well known that nano bubbles can live for a long time. The smaller bubbles have bigger pressure inside by Young-Laplace equation. Therefore we want to integrate hydrogen production and hydrogen storage by photocatalytic to generate nano hydrogen bubbles. This research focus on how to generate a large number of uniform hydrogen micron bubbles, and those bubbles can depart from surface. Experimental results demonstrated hydrophobic modified photocatalyst can produce a uniform hydrogen micron bubbles, but which are difficult to depart from surface. To help bubbles from the surface, eventually we set up a the ultrasonication in hydrogen bubbles production system by photocatalytic.