- 學位論文
控制奈米電雙層於離子交換膜孔洞應用於濃差發電
Manipulation of Electrical Double Layer Overlap In Ionic Membrane For Salinity Gradient Power Generation
摘要
本實驗提出藉由施加電壓改變薄膜表面電荷，在電解液中行成電雙層現象，藉由控制電壓大小使電雙層疊合於大孔徑內，阻擋同電荷離子做為離子交換膜，並實驗證明此薄膜可應用於濃差發電。 實驗使用市售AAO(Anodic Aluminum Oxide, AAO)膜於薄膜表面上改質，使用濺鍍機(Sputter) 濺鍍一層金屬鋁膜後作為導電層，再用原子層沉積系統(Atomic Layer Deposition, ALD)沉積高介電常數二氧化鉿(HfO2)作為介電層，藉由施加電壓於金屬層使介電層表面累積電荷至於溶液中產生電雙層現象，控制施加電壓可使電雙層可以在10奈米孔徑下疊合，此設計相比於滲透膜(Pressure-Retarded Osmosis, PRO)及逆透析(Reverse Electrodialysis, RED)，薄膜孔徑大約五到十倍，實驗結果顯示在電雙層疊合情況下，薄膜電阻值比未疊合低3.2~7.1倍，此外可由施加負電壓於薄膜上使二氧化鉿表面帶負電荷，與陽極氧化鋁表面帶正電荷相異，形成文獻11中的複合膜結構，抑制離子濃度極化現象(Ions Concentration Polarization )的影響效果，實驗結果在複合結構情況下電阻值低了9.27倍，提升離子滲透率，實際測試在濃差環境下其發電量為0.012 W/m2，效率為12%，提出了一種新的離子交換薄膜可應用於濃度差能發電。
並列摘要
This paper proposes to manipulate the thickness of the electro-double-layer (EDL) inside the anodic aluminum oxide (AAO) nanochannels as an ionic diode membrane to select uni-ions as through electrical static charges. By applying enough bias on membrane, EDL can overlap and block counter ion outside the channel in 10nm holes, which is 2~10 times larger than the membrane of Pressure-Retarded Osmosis or Reverse Electrodialysis. The resistance of EDL overlapped is 3.2~7.1 lower than non-overlapped. Besides, by applying negative bias on membrane can induce negative charges on HfO2 surface, which is opposite to the AAO surface in the electrolyte to form a heterojunction interface. Based on the reference [11], this heterojunction interface between two different charge layers can suppresses the ions concentration polarization (ICP) effect and enhances the rectification ratio. The resistance of the membrane with this heterojunction interface is 9.27 lowers than the membrane without it. Finally, proving by experiment, this membrane can be used in salinity power generation, which is considering as a great potential, renewable energy.