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磺化聚碸-石墨烯奈米複合質子交換膜於釩液流電池之應用 = Sulfonated Polysulfone-graphene nanocomposites for proton exchange membranes of the vanadium redox flow battery / 簡明彥.

館藏資訊

摘要註

隨著綠能科技被日益重視，無毒發電的各項應用更是被廣泛提出。在 這些再生能源的浪潮中，如何儲能也是必須齊頭並進的技術。在這些不 知凡幾的儲能電池中，我們找到了全釩氧化還原液流電池(Vanadium redox flow battery, VRFB)，質子交換膜為整副電池組的核心，左右兩側電 解液以平行液流行經碳氈電極並產生氧化還原反應，經過質子交換後， 再透過雙電極板進行電流的收集與傳導，最終將由電解液之化學能所轉 換之電能儲存於外接電解液槽中，循環電解液進行儲能。本研究之質子 交換膜以聚碸(Polysulfone, PSF)高分子為主要材料來製備質子交換膜，並 進一步加以磺化(SPSF)，經由不同重量百分比的 PSF 與 SPSF 來控制薄膜孔 隙度，再加入磺化之氧化石墨烯(sGO)提升薄膜效率，探討整體全釩氧化 還原液流電池之效率。 磺 化 石 墨 烯 與 磺 化 PSF 以 化 學 法 製 備 ， 製 備 出 面 積 約 70mm×250mm(膜厚 30~100 mm)的質子交換隔離膜，經由調配不同磺化 石墨烯的重量百分比以達到最佳電效率。材料分析方面，使用 X 光射線 電子能譜儀(XPS)與傅立葉轉換紅外光譜(FTIR)，確認磺化石墨烯與磺化聚 碸皆成功接枝上磺酸根官能基團。掃描式電子顯微鏡(SEM)可以看到 PSF/sGO 質子交換膜之表面傳輸孔洞大小與分布狀態皆非常均勻，代表混 合物均均勻散佈在膜中。水接觸角量測可以發現隨著磺酸根的量逐漸增 加，交換膜的親水性也隨之增加，改善原始 PSF 不親水之特性。隨著磺酸 根改質於 PSF 與氧化石墨烯(GO)中，可以發現質子交換膜的質子交換率逐 漸上升，使交換膜能保持良好的庫倫效率(CE)，並同時逐漸增加電壓效率 (VE)及總能量效率(EE)。結果顯示， 14SPSF/0.4SGO 質子交換膜能取得最好 的效率(CE： 92.5%、 VE： 76.8%及 EE Nowadays, with the increasing emphasis on green energy technology, various applications of non-toxic power generation have been widely proposed. The proton exchange membrane (PEM) used in this study was made of polysulfone (PSF) as the main materials, and the porosity of the membrane was controlled by different weight percentages of PSF. Then, sulfonated graphene oxide (sGO) was added to increase the membrane efficiency and make it Improve the efficiency of the overall all-vanadium redox flow battery. In this study, PEM produced sizes of 70 mm × 250 mm and uniform thickness of 30 μm to 100μm. In terms of material analysis, by using X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) could confirm that both sulfonated graphene oxide and sulfonated polysulfone were successfully grafted with sulfonate functional groups. Scanning electron microscope (SEM) shows that the size and distribution of the surface transport pores of the PSF/sGO proton exchange membrane are very uniform, indicating that the mixture is uniformly dispersed in the membrane. The water contact angle measurement shows that with the increase of the amount of sulfonate, the hydrophilicity of the exchange membrane also increases, which improves the non-hydrophilic properties of the original PSF. With the addition of sulfonate to PSF/graphene oxide (GO) membrane, it can be found that the proton exchange rate of the proton exchange membrane gradually increases; thus, the exchange membrane can maintain a great Coulomb efficiency (CE), and at the same time gradually increase the voltage efficiency (VE). Finally, 14SPSF/0.4SGO membrane can achieve the optimal efficiency (CE: 92.5%, VE:76.8%, EE:71.04%), and the total energy efficiency is increased by 1.2 times. The storage efficiency of VRFB could be sufficiently improved by sulfonated PFS membrane and GO nanosheets, which would be potential to apply in the green energy.

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