PEM水電解製超氧技術中陽極PbO2/Nafion比例之最佳化

Optimization of Nafion/PbO2 in Anode for Ozone Generation with PEM Water Electrolyzer Technology

葉佳鎮(Chia-Chen Yeh)

指導教授 ： 鐘國濱

元智大學/工程學院/機械工程學系/碩士(2012年)

摘要

本論文以膜電極組行水電解製超氧技術解決日益嚴重之工業及民生環境汙染問題。目前水電解製超氧之膜電極組之主要技術以白金/Nafion 膜/氧化鉛（陰極/電解質/陽極）為主。為提升超氧產生效率，採用氧化鉛並增加Nafion於陽極為主流之作法，而衍生之問題為(1)斷電後之覆電將導致性能驟降；(2)高阻值氧化鉛。本研究最佳化陽極組成並添加低阻抗之氧化鉛，藉以提升水電解製超氧壽命並改善斷電後覆電之超氧生成效果。上述完成之陽極(暨膜電極組)，將置入電解器中進行短時間電性實驗(電壓/電流/超氧濃度/系統阻抗)，以了解在不同環境下之性能變化。至於斷電後之再啟動特性，本論文亦完成運轉前後中斷特定時間(膜電極組未活化、活化8小時、電源中斷效能實驗16小時)之覆電測試(定電壓4.5V)。本論文首度將電化學阻抗分析(Electrochemical Impedance Spectroscopy, EIS)搭配其他電化學量測設備加入水電解製超氧之研究。

關鍵字

超氧 ； Nafion ； 水電解 ； 膜電極組 ； 氧化鉛 ； 電化學阻抗分析

並列摘要

Purpose of this thesis is to produce ozone with water electrolyzer technology using membrane electrode assembly (MEA) to solve the increasingly serious pollution from industry and livelihood. Current MEA materials used to produce high concentration ozone using water electrolysis technology is based on Pt/Nafion/PbO2 (cathode/electrolyte/anode). To enhance the efficiency of ozone production/durability, increased use of Nafion in addition to PbO2 as anode materials have been the mainstream of research trend. However, the arised problems includes : (1) sudden drop of the performance after re-start;(2) high resistance of PbO2 . This thesis is to optimize the composition of the anode (Nafion/PbO2) and low-resistance PbO2, in order to enhance the performance of water electrolysis and improve the characteristic after re-start. The as-prepared anode (and MEA) is installed into the electrolyzer for electrical evaluation (voltage / current / ozone concentration / system impedance) to learn their performance under different conditions. As for the performance characteristic after re-start, this project is intend to shut down the electrolyzer for a specific period of time (as-prepared, after activated for eight hours, interrupted for sixteen hours) and then to investigate the performance after re-start (constant voltage = 4.5V). Among all the test equipments, electrochemical impedance spectroscopy (EIS) is utilized in ozone generation for the first time.

並列關鍵字

Ozone ； Nafion ； Electrochemical Impedance Spectroscopy (EIS) ； PbO2 ； Water Electrolyzer ； Membrane Electrode Assembly (MEA)

參考文獻

【13】林佳弘，「水電解製臭氧技術中陽極老化因素之探究」，元智大學機械工程學系，碩士論文，2008。

【14】邱鉦凱「水電解製臭氧陽極材料抗衰退之探究」，元智大學機械工程學系，碩士論文，2009。

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