Nafion/LiCl稀釋溶液和H2PtCl6/Nafion稀釋溶液 及H2PtCl6/Nafion薄膜之性質研究

Properties of Nafion/LiCl dilute solutions and H2PtCl6/Nafion dilute solutions and properties of H2PtCl6/Nafion thin films

游雅蘭(Ya-Lan Yu)

指導教授 ： 林秀麗

共同指導教授 ： 余子隆(Tzyy-Lung Yu)

元智大學/工程學院/化學工程與材料科學學系/碩士(2009年)

摘要

全氟磺酸化樹酯(Nafion)是一個具有氟碳主鏈及帶-SO3－的支鏈，且具有二個溶解參數之高分子。Nafion分子在溶劑中之溶解性及分子構形(conformation)受溶劑之溶解參數及介電常數影響很大，進一步會影響到觸媒粒子在Nafion溶液中分散性。
本論文利用動態黏彈儀(Viscoelasticity analyzer，VE)、動態光散射(Dynamic light scattering，DLS)研究Nafion/LiCl溶液物理性質。將H2PtCl6/Nafion揮發溶劑注型成膜，經由H2還原Pt+4離子之Pt觸媒，利用微差熱掃描分析儀(Differential scanning calorimeter，DSC)，X光繞射(X-ray diffraction，XRD)及穿透式電子顯微鏡(Transmission electron microscope，TEM )觀察觸媒在各溶劑中還原分佈情形。利用循環伏安儀(Cyclic voltammetry，CV) 探討還原之Pt觸媒在碳紙上的使用效率，以期尋求適當的溶劑製作觸媒層。
本論文所使用之溶劑：二甲基乙醯胺(DMAc)，二甲基甲醯胺(DMF)，甲基甲醯胺(NMF)，甲醇/水(MeOH/H2O (4:1 g/g))；乙醇/水(EtOH/H2O (4:1 g/g))；異丙醇/水(IPA/H2O (4:1 g/g))。

關鍵字

Nafion，H2PtCl6，溶液，薄膜

並列摘要

Nafion, an ionomer composed of perfluorocarbon backbone and vinyl ether side chains terminated with –SO3－groups, has dual solubility parameters, i.e. δ1= 9.7 (cal/cm3)1/2 relating to perfluorocarbon backbones and δ2= 17.3 (cal/cm3)1/2 relating to sulfonic acid side chains. The solubility parameters and dielectric constants of solvents have great influences on the conformations of Nafion in the catalyst solutions.
In this study, we investigate the physical properties of Nafion/LiCl solutions by viscoelasticity analyzer (VE) and dynamic light scattering (DLS). Then, the differential scanning calorimeter (DSC), X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to investigate the morphology of thin films prepared from H2PtCl6/Nafion solutions after reduction of Pt+4 ions to Pt. Cyclic voltammetry(CV) technique was used to determine electrochemical active surface area of Pt catalysts after reduction of Pt+4 on carbon paper.
The solvents are DMAc (N,N-dimethylacetamide), DMF (N,N-dimethylformamide), NMF (N-methylformamide), MeOH/water(methanol/water), EtOH/water (ethanol/water) and IPA/water(propanol/water).

並列關鍵字

Nafion，H2PtCl6，solution，thin film

參考文獻

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