本研究利用兩性膜(Bipolar membrane)獨特的電場加強水解離特性，以本實驗室核心技術-電漿誘導接枝法，將不同陰陽離子型單體N,N-Dimethyl amino ethyl acrylate (DMAEA)、4-Styrene sulfonic acid sodium salt hydrate (SSS)及2-methylacrylic acid 3-(bis-carboxymethylamino)-2-hydroxy-propyl ester (G-I)分別誘導接枝在PVDF膜或PES兩側形成DMAEA-PVDF-SSS、DMAEA-PES-SSS及GI-PVDF-GI三種兩性膜。另外，也使用Poly-ethersulfone (PES)膜作為背景基材，進行比較實驗。經電子顯微鏡及FTIR分析的結果顯示，於PVDF或PES兩側接枝的陰陽離子層均勻地覆蓋在膜表面。以DMAEA-PVDF-SSS兩性膜作為水電解槽的隔膜之水電解性能最佳，經電化學分析儀偵測的結果顯示，利用DMAEA-PVDF-SSS兩性膜的強化電場作用可將水解離成H+ 與OH- 的電位降低至0.90 V。當改變KCl濃度或者電解質種類時，其臨界電位不會隨之改變，但極限電流密度會隨著KCl濃度或電解質的擴散係數增加而增加。三種兩性膜的工作電位都明顯低於PES膜系統，也說明了兩性膜有降低工作電位的效果。其中，使用DMAEA-PVDF-SSS兩性膜為隔膜時，工作電位可比PES系統減少約510 mV左右；在產氫氣效率方面，可以增加10-20 %左右；同時，可以減少產氫氣所需的能量消耗達25-40 %。DMAEA-PVDF-SSS兩性膜在長時間操作下，效率值皆能維持在80 %以上，其電解水的能耗比Astom公司的商用兩性膜低20 %能量左右，為一具有高商業化價值的兩性膜。

A monomer, N,N-Dimethyl amino ethyl acrylate (DMAEA), 4-Styrene sulfonic acid sodium salt hydrate (SSS), 2-methylacrylic acid 3-(bis-carboxymethylamino)-2-hydroxy-propyl ester (G-I) and the porous poly(vinylidene fluoride) (PVDF) membrane, poly(ethersulfone) (PES) membrane were used to prepare three types of bipolar membranes(BMs) by plasma-induced polymerization. After the monomer was grafted onto the surface of the membranes, results of the contact angle of the bipolar membranes were significantly reduced. Fourier transform infrared spectroscopy and scanning electron microscopy were also used to identify the grafting polymerization of the monomer on the membrane surface. From the I-V curve, the critical voltage is shown to be independent of the concentration and type of electrolyte. Moreover, the critical voltage of the DMAEA-PVDF-SSS bipolar membrane was around 0.9 V. The performance is demonstrated by measuring the cell voltage and rate of hydrogen production for cells operated with or without the BMs. Cell voltage reductions of up to 510 mV by using the DMAEA-PVDF-SSS bipolar membrane is observed at 250 mA/cm2 in 0.1 M K3PO4, compared to the water system. The efficiency of H2 production, by using the BMs as diaphragms is enhanced about 10-20% compared with the water system. In addition, the energy saved by using the DMAEA-PVDF-SSS BMs is decreased by around 25-40% at certain values of current densities. Under long-term operation, self-made bipolar membranes have better hydrogen production efficiency and energy saving effect than commercial membranes. It is a bipolar membrane with high commercial value.

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