利用脈衝與多電極在酸鹼質子交換膜水電解的效率之分析

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伍偉華(Wei-Hua Wu) 查詢紙本館藏

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能源工程研究所

論文名稱

利用脈衝與多電極在酸鹼質子交換膜水電解的效率之分析
(The analysis of efficiency on the acido-alkaline proton exchange membrane water electrolysis by using multi-electrode and pulse)

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摘要(中)

實驗利用多組鎳電極，於氫氧化鉀和硫酸電解液，加入脈衝下進行質子交換膜電解水產氫(PEMWE)，由恆電位儀量測相關數據，探討不同電壓值、電極組數、脈衝時間、週期，基礎電位與電流的關係，利用酸和鹼電解液在PEMWE下可以降低電解電壓到0.7V，並且提升產氫的效率;多電極降低整體的電阻阻抗，進而提升能源效率，最後再加入脈衝後，使得瞬間電流值會增加、產生的氫氣迅速脫離電極表面、加速離子的擴散速度，降低電極上的極化現象，進而提升產氫的效率以及節能的效果。
加入脈衝量測後，在電極間距10mm，酸與鹼濃度在30wt%、頻率為100Hz時，在4V的能源效率比未加入脈衝時提升了約15%，而五組電極在2V有著較好的效率，增加達到98.6%的能源效率。

摘要(英)

In this experiment, multiple sets of nickel electrodes were used to produce hydrogen by proton exchange membrane water electrolysis (PEMWE) under the action of pulses and potassium hydroxide and sulfuric acid electrolytes. The relevant data were measured by potentiostat, and effects of applied voltage, number of electrode groups,base potential and pulses on the efficiency were investigated. Results show that dual cells and electrolytes can reduce the electrolysis voltage to 0.7V, and improve the efficiency of hydrogen production. Multi-electrode reduces the overall resistance and impedance, thereby improves the energy efficiency. finally as the pulse is added, the instantaneous current value is increased, and the generating hydrogen gas deviates rapidly from the surface of the electrode, accelerates the diffusion speed of the ions, and reduces the polarization phenomenon on the electrode. The efficiency of hydrogen production is thus improved.
As the electrode spacing is 10 mm, the acid and alkali concentration is 30% by weight, and the frequency is 100Hz, The energy efficiency at 4V is about 15% higher than no pulse is used. and five groups of electrodes at 2V have the best efficiency of 98.6%.

關鍵字(中)

★ 電解水
★ 質子交換膜
★ 多電極
★ 脈衝
★ 產氫

關鍵字(英)

★ water electrolysis
★ proton exchange membrane
★ multi-electrode
★ pulse
★ hydrogen production

論文目次

摘要 I
ABSTRACT II
目錄 III
表目錄 IV
圖目錄 V
符號說明 VI
第一章緒論 1
1-1 前言 1
1-2 文獻回顧 2
1-3 研究目的與動機 4
第二章理論基礎 5
2-1 電解水產氫之基本原理 5
2-2 吉布斯自由能 6
2-3 電解電壓 7
2-4 法拉第電解定律 8
2-5 極化作用 9
2-5-1 濃度極化 9
2-5-2 活性極化 10
2-5-3 歐姆極化 11
2-5-4 實際分解電位 12
2-6 脈衝電壓 13
2-7 導電度 14
2-8 效率 14
2-8-1 電功率 14
2-8-2 能源效率 14
第三章實驗裝置 16
3-1 實驗用品 16
3-1-1 實驗藥品 16
3-1-2 實驗材料 16
3-2 實驗儀器 18
3-2-1 電解槽 18
3-2-2 恆電位儀 18
3-2-3 溫度量測器 18
3-2-4 磁石攪拌器 19
3-2-5 氣體質量流量計 19
3-2-6 質子交換膜 19
3-2-7 導電度量測儀 20
3-3 實驗架設 21
3-3-1 恆電位儀 21
3-3-2 實驗變數 21
3-3-3 導電度量測 22
3-3-4 脈衝下恆電位儀與產氫量之量測 22
第四章結果與討論 24
4-1 脈衝對實際電解電位之影響 24
4-2 在不同循環負載下電解水之影響 25
4-2-1 不同循環負載下所量測的I-V圖 25
4-2-2 不同循環負載下所量測的產氫量 26
4-2-3 不同循環負載對電解水之能源效率分析 27
4-3 在不同基礎電位下電解水之影響 28
4-3-1 不同基礎電位下所量測的I-V圖 28
4-3-2 不同基礎電位下所量測的產氫量 29
4-3-3 不同基礎電位對電解水之能源效率分析 30
4-4 電極組數在最佳電解效率下的影響 31
第五章結論與未來展望 33
5-1 結論 33
5-2 未來展望 34
參考文獻 35

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指導教授

洪勵吾

審核日期

2018-8-21

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