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研究生：	蔡宗承 Tsai, Tsung-Chen
論文名稱：	使用奈米膜在微流體與奈米流體系統之微型可逆電透析的能量產生 Power Generation by Reverse Electrodialysis in Nanopore Membranes from a Microfluidic and Nanofluidic System
指導教授：	楊瑞珍 Yang, Ruey-Jen
學位類別：	碩士 Master
系所名稱：	工學院 - 工程科學系 Department of Engineering Science
論文出版年：	2016
畢業學年度：	104
語文別：	英文
論文頁數：	51
中文關鍵詞：	可逆電透析，鹽分梯度能源、吉布斯自由能、納菲翁薄膜、能源轉換
外文關鍵詞：	Reverse electrodialysis, Salinity gradient power, Gibbs free energy, Nafion membrane, Energy conversion
相關次數：	點閱：94 下載：4
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本研究利用微機電製程技術，使用新方法去製作直通管式的通道(1 mm, 2 mm, 3 mm)並且注入具有陽離子選擇性的納菲翁(Nafion)溶液，等待乾燥而形成薄膜，利用可逆電透析原理並在通道兩邊儲存槽放置不同濃度的氯化鉀(KCl)溶液。不同鹽度梯度氯化鉀溶液(CL:1 mM CH:10 mM,100 mM,1000 mM,2000 mM)混合所產生的吉布森自由能轉換成電能。我們量測納菲翁(Nafion)膜的電壓-電流曲線，並可從此獲得擴散電壓、離子遷移數、功率值與效率。並由實驗得到最佳的擴散電位為152 mV，擴散電流為249 nA，最大功率為755 mW/m2，本實驗的最佳效率為31%。根據歐姆定律，在定電壓情況下，當管道長度縮短時阻值降低然而相對提升電流值，當電解液濃度梯度增加時，也會提高擴散電位，其中擴散電位關係到電場強度大小，電場強度越大所造成在遷移陽離子的阻力，而陽離子遷移路徑是由高濃度往低濃度方向，因此上述使整體電流值並無隨著濃度梯度提高而增大

In this thesis, we propose the fabrication of an energy conversion microchip using a standard micro-electromechanical technique. Moreover, this new device uses a microfluidic channel (Length:1 mm, 2 mm, 3 mm) with injected Nafion solution, and then dried to become a cation-selective membrane between two KCl solutions with various concentration combinations (CL:1 mM CH:10 mM,100 mM,1000 mM,2000 mM) by reverse electrodialysis. The Gibbs free energy of mixing from a salinity gradient can be converted into electrical energy by using a selective membrane. We measured the current-potential characteristics of the Nafion membrane so that the diffusion potential, transference number, power values, and efficiency can be obtained. The highest measured diffusion potential, short-circuit current, and power density are 152 mV, 249 nA, and 755 mW/m2, respectively, while the best efficiency obtained in this study was 31 %. According to Ohm’s Law, and when the voltage is constant, the highest current occurs when the channel length is the shortest. Moreover, a longer channel length causes more resistance, so the produced power is smaller. If the electrolyte concentration ratios are increased, the diffusion potential will be enhanced. The electrical field is related to the diffusion potential, and it produced a barrier to the cation migration from high concentration to low concentration. Accordingly, the short circuit current was not enhanced at a high concentration ratio.

Abstract	I
中文摘要	II
致謝	III
Table of Contents	V
List of Table	VI
List of Figure	VII
Abbreviation	X
Greek symbols	X
Namenclature	XI
Chapter 1 Introduction	1
1-1 Reverse Electrodialysis (RED)	2
1-2 Literature Review	3
Chapter2 Fundamental Theory on Electrodialysis Energy Conversion	6
2-1 Electrochemical Cell	6
2-2 Gibbs free energy of Mixing	7
2-2-1 Nernst Equation	8
2-2-2 Nernst-Planck Equation	9
2-3 Liquid Junction Potential	11
2-4 Ionic Mobility and Transference Number	12
2-5 The Basic Theory of Reverse Electrodialysis	14
2-6 Derivation of the Diffusion Current/Potential and Conversion Efficiency	16
2-7 Electrical Double Layer (EDL)	19
Chapter 3 Materials and Methods	21
3-1 Materials	21
3-1-1 The Different Electrode Species	21
3-1-2 Preparation of Electrode	23
3-1-3 Preparation of Electrolyte	24
3-1-4 Preparation of the Membrane	25
3-2 Instruments	26
3-2-1 Nano-current Measurement	26
3-2-2 Plasma System	26
3-2-3 pH Meter	27
3-3 Fabrication of Microchip	28
3-3-1 Substrate Pretreatment	29
3-3-2 Photoresist Coating and Exposure	29
3-3-3 PDMS Casting	30
3-3-4 Oxygen Plasma Bonding	31
3-3-5 Nafion Injected Process	31
3-3-6 Microchip Design	32
3-4 Measurement of Electrode Potential	33
3-5 Measurement of Diffusion Potential and Diffusion Current	34
Chapter 4 Results and Discussion	36
4-1 The Effect of Different Dilute Proportion of the Nafion Solution in the Microchannel	36
4-2 The Effects of Different Microchannel lengths on the Different Salinity Gradients	38
Chapter 5 Conclusion	48
References	49

                                    

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校內：2021-07-15公開
校外：2021-07-15公開

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