陰極添加氧化物種對臭氧產生量影響之研究

The effect of cathode catalyst with the oxidized species on the ozone production rate using a PEM electrolyzer

郭國謙(Guo-Chien Kuo)

指導教授 ： 蘇艾

元智大學/工程學院/機械工程學系/碩士(2007年)

https://doi.org/10.6838/YZU.2007.00085

摘要

臭氧為強氧化劑，殺菌為氯的3000倍其在水中殘留時間短無殘留之危害。生產臭氧的設備多樣化，但高臭氧濃度和低生產能量是被高度期待。電解臭氧技術為燃料電池的逆反應，電解法主要分為化學電解和膜電解(PEM)。PEM電解技術是採用低壓直流電導通固態膜電極正負兩極電解純水，使水在陽極溶界面上失去電子使氫分離，氧在高密度電流作用下獲得能量，並聚合成臭氧。
本實驗所使用膜電極組分別為Nafion 117、陽極使用β-PbO2、陰極使用Pt觸媒接觸電解質材料。利用電解質將水電解後於陽極產生臭氧/氧，陰極產生氫氣。本文在探討陰極端添加氧化物種，除使氫氣含量減少並導致臭氧生成量增加，以及觀察在不同流量下的性能曲線、臭氣濃度、最佳添加量及長時間之影響。並利用燃料電池測試機台添加背壓，觀察壓力增加之影響。最後，利用氣相層析分析(GC)分析陰極端之氫氣含量，印證添加氧化物種對陰極氫氣含量之減少。

關鍵字

臭氧生成 ； 氧化物 ； 臭氣水 ； β-PbO2 陽極觸媒 ； 水電解

並列摘要

The ozone is a strong oxidant. Its sterilization ability is 3000 times stronger than chlorine. It lasts for just a short time and won't remain in the water. So there's no harm for human body. There are many ozone generators, but the high ozone density and the low production energy are highly anticipated. Electrolytic ozone generation technology is the reverse reaction of fuel cell, it is mainly divided into two kinds：Chemical Electrolysis and Polymer Electrolyte Membrane (PEM). The PEM ozone technology uses the low-pressure direct current to connect anode and cathode of the special solid membrane and then the pure water is electrolyzed, causes the water on the anode to lose electrons and causes the hydrogen to separate. Oxygen gets energy under high concentration current, then polymerize into ozone.
This experiment uses the MEA which is composed of Nafion 117 and β-PbO2 in anode and Pt catalyst in cathode. Making use of the electrolyte to electrolyze water to produce ozone/oxygen in anode and the hydrogen in cathode. The research is to discuss that adding oxidation species to the cathode to decrease the content of hydrogen to elevate the concentration of ozone, and then observing the current density, ozone concentration, the best value of gas adding to the cell and the effect when the cell is operated during long time in different flow ratio. To use the test machine of fuel cell to add back pressure and then observe the variety. In the end, using GC to analyze the content of hydrogen in cathode to verify adding oxidation species will decrease the content of hydrogen in cathode.

並列關鍵字

Ozone production ； Oxide ； Ozone water ； β-PbO2 anode catalyst ； Water electrolysis

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【18】卓敏貴，「氧氣端電極觸媒物種對URFC特性之研究」，元智大

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