本文選題：多孔配位聚合物 + 金屬有機(jī)骨架�。� 參考：《東北師范大學(xué)》2017年碩士論文

【摘要】：質(zhì)子交換膜燃料電池由于其能量轉(zhuǎn)化效率高,噪音低,污染小,便攜等優(yōu)勢(shì)得到了越來(lái)越廣泛的關(guān)注。而商用質(zhì)子交換膜——全氟磺酸膜由于其造價(jià)昂貴,制約著質(zhì)子交換膜燃料電池的廣泛應(yīng)用。因此,新型質(zhì)子傳輸材料的開發(fā)成為這一領(lǐng)域的重點(diǎn)。配位聚合物作為新興的多孔固態(tài)電解質(zhì),具有微觀有序的三維孔道,并且尺寸可調(diào),功能化選擇多樣,所以作為質(zhì)子傳導(dǎo)材料具有很好的潛質(zhì)。本文首先合成了含水簇化合物的配位聚合物Zn2-(H2O)12并用壓片法通過(guò)交流阻抗譜圖研究了它的質(zhì)子傳導(dǎo)行為。在沒有添加其它質(zhì)子源的情況下,在90℃,95%相對(duì)濕度條件下的質(zhì)子傳導(dǎo)率達(dá)到了4.88×10-3 S·cm-1。Zn2-(H2O)12水簇自身的緊密排布形態(tài),增加了對(duì)配位聚合物內(nèi)部孔道空間的利用率,對(duì)在溫度較高的條件下提升質(zhì)子濃度和載體濃度都具有積極作用,并且由于該化合物孔道的三維聯(lián)通性,對(duì)以Vehicle機(jī)理進(jìn)行的質(zhì)子傳輸活動(dòng)有很大的促進(jìn)作用;另外緊密的排布使水簇在b軸向上形成了長(zhǎng)程的氫鍵網(wǎng)絡(luò)連接,故而以Grotthuss機(jī)理進(jìn)行的質(zhì)子傳導(dǎo)也得到了提升。此項(xiàng)研究表明,提升多孔配位聚合無(wú)材料的質(zhì)子傳導(dǎo)性能不僅需要合理的對(duì)于骨架和客體分子的雙向設(shè)計(jì)選擇,還需要充分使客體分子的排布更加緊密,填充方式更加合理,才能夠最大化發(fā)揮客體分子的質(zhì)子傳導(dǎo)能力。多酸由于廉價(jià),酸性強(qiáng)等特點(diǎn)可以成為很好的質(zhì)子載體。而多酸作為客體添加到金屬有機(jī)骨架當(dāng)中的案例已有報(bào)道。多酸自身的酸性和金屬有機(jī)骨架對(duì)多酸的保留能力使得二者相互之間有所協(xié)同,用于質(zhì)子傳導(dǎo)性能研究具有一定前景。本文選擇NENU-5為研究對(duì)象,初步探索了進(jìn)一步添加小的質(zhì)子載體分子對(duì)NENU-5化合物質(zhì)子傳導(dǎo)性能的提升條件。通過(guò)改變添加客體分子的pH條件,合理分布?jí)A性小分子客體,我們發(fā)現(xiàn)通過(guò)添加NH3分子,該化合物質(zhì)子傳導(dǎo)率達(dá)到了2.38×10-4S·cm-1。研究表明,多酸在金屬有機(jī)骨架當(dāng)中移動(dòng)性差,質(zhì)子傳導(dǎo)能力受到限制,通過(guò)添加小分子質(zhì)子載體分子,使其圍繞在多酸陰離子周圍,有效的提升了多酸-金屬有機(jī)骨架的質(zhì)子傳導(dǎo)性能。
[Abstract]:Proton exchange membrane fuel cells (PEMFC) have attracted more and more attention due to their high energy conversion efficiency, low noise, low pollution and portability.Because of its high cost, commercial proton exchange membrane-perfluorosulfonic acid membrane restricts the wide application of proton exchange membrane fuel cells.Therefore, the development of new proton transport materials has become the focus of this field.As a new porous solid electrolyte, the coordination polymer has a micro-ordered three-dimensional pore, adjustable size, and a variety of functional selection, so it has a good potential as a proton conduction material.In this paper, the coordination polymer Zn2-(H2O)12 has been synthesized and its proton conduction behavior has been studied by means of AC impedance spectroscopy.Without the addition of other proton sources, the proton conductivity at 90 鈩，

本文編號(hào)：1768465