臺灣博碩士論文加值系統

本研究主要目的在於對石墨氈進行改質，降低其電荷轉移阻抗能增加其作為全釩液流電池的電極時，全釩液流電池的庫倫效率和能量效率。因為碳本身是疏水性，會使得硫酸氧釩電解液不易進入石墨氈內部，電極與電解液接觸面積變小，電荷不易轉移，電荷轉移阻抗就相對的大，電池的庫倫效率與能量效率也會相對變差。本實驗使用芬頓試劑，利用其中的羥基自由基的強氧化性來氧化石墨氈的碳而接上親水基團，如羥基與羧基。添加石墨烯粉末以及提高雙氧水的濃度來增加芬頓試劑的羥基自由基，希望能使石墨氈接上更多的羥基自由基使其活性面積更大。
從XPS分析中得知石墨氈中O-H比例增加，從CV實驗中可以發現釩離子氧化還原反應更容易發生，從EIS實驗中看到阻抗也確實降低，而最重要的電池庫倫效率、能量效率及伏特效率在100 mA/cm^2條件下也從未處理的96.7%、67.3%和69.9%提高到98.5%、75.2%和76.3%。

The graphite felt was used as a part of the electrode of vanadium redox flow battery. The graphite felt was modified to reduce its charge transfer resistance and increases Coulomb efficiency and energy efficiency. Since untreated graphite is hydrophobic, vanadyl sulfate electrolyte is hardly to flow into the graphite electrode. The charge transfer resistance between graphite felt and the electrolyte is very large, and Coulomb efficiency and energy efficiency of the battery is deteriorated. Fenton's reagent was used and the strong oxidation ability of hydroxyl radical (OH •) was utilized to oxidize carbon and hydroxyl and carboxyl groups were bonded. In order to induce larger active surface area on the graphite felt, graphene powder was added and the concentration of hydrogen peroxide was increased to increase the hydroxyl radical concentration of Fenton reagent.
XPS analysis proved that OH group in the graphite felt was increased. Vanadium redox reaction was inclined to take place as proved by CV experiments. The charge transfer resistance was lowered as seen from the EIS experiments. Under condition of 100 mA/cm^2, the Coulomb efficiency, energy efficiency and voltage efficiency of the battery with untreated graphite felt of 96.7%, 67.3% and 69.9% were increased to 98.5%, 75.2% and 76.3% respectively.

摘要
Abstract
目錄
表目錄
圖目錄
第一章 緒論
1-1前言
1-2研究動機與目的
第二章 理論與文獻回顧
2-1全釩液流電池簡介
2-2 石墨氈改質法概述
2-2-1氧化法
2-2-2表面沉積法
2-3芬頓試劑
2-4三極式量測
2-5交流阻抗分析
第三章 實驗方法與步驟
3-1 研究內容
3-2實驗藥品及設備
3-3 實驗步驟
3-4 檢測儀器與方法
第四章 結果與討論
4-1 XPS分析
4-2 循環伏安測試
4-3 EIS分析
4-4 充放電表現
第五章 結論
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