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    Title: 利用加入膠化劑製備聚乙二醇膠態電解質及應用於染料敏化電池
    Other Titles: Preparation of polyethylene glycol gel electrolyte by the addition of gelators and their application in dye sensitized solar cells
    Authors: 陳建助;Chen, Chien-Chu
    Contributors: 淡江大學化學工程與材料工程學系碩士班
    賴偉淇;Lai, Wei-Chi
    Keywords: 聚乙二醇;二苯亞甲基山梨醇;膠化劑;膠態電解質;poly(ethylene glycol);nanofibrils;DBS;gel electrolyte
    Date: 2011
    Issue Date: 2011-12-28 18:49:27 (UTC+8)
    Abstract: 本研究分為二部份,首先探討二苯亞甲基山梨醇(DBS)添加在不同分子量的聚乙二醇(PEG)與不同末端基分別為聚乙二醇二甲醚(PEGdme)、聚乙二醇甲基丙烯酸酯(PEGmea)、聚乙二醇縮水甘油醚(PEGdce)形成有機膠的結構、流變性質及熱性質;接著將鋰化碘(LiI)與碘(I2)添加入高分子PEG中形成高分子電解質,探討導電性質及應用於染料敏化太陽能電池的工作效率與時間穩定性。
    DBS可以在PEG中形成有機膠,利用POM可觀察到似球晶結構;實驗結果顯示,當DBS濃度上升時,似球晶結構的數目變多,當DBS濃度固定,隨著PEG分子量的增加,可觀察到似球晶結構數目的增加;在不同末端基的PEG,可觀察到取代末端OH基的PEGdme、PEGmea及PEGdce,似球晶結構的數目較多。有機膠隨著頻率掃描變化,有機膠的彈性模數G’不會改變,G’大於G”,因此可證明其為凝膠。PEG的不同也影響了DBS成膠溫度、成膠時間及凝膠熔解溫度,隨著分子量的提升,有機膠的熔化熱也隨之增加,而成膠時間縮短;不同末端基的PEG部分有機膠有最高的成膠溫度及凝膠熔解溫度由高至低依次為PEGmea、PEGdme、PEGdce、PEG400,相對的成膠時間較短,TGA分析可觀察到當DBS添加後,提升了起始熱裂解溫度,增加了有機膠的熱穩定性。從IR及UV光譜可了解DBS在自我組裝時氫鍵作用力越大,相對的pi-pi作用力也越大,以及DBS苯環堆疊的方式。
    在於加入 LiI與I2的電性質,由實驗觀察發現隨著PEG分子量增加,膠態電解質的導電度逐漸降低,在PEG末端基不同部分,導電度由大到小依次為PEGdme、PEGmea、PEG400、PEGdce。利用PEG液態高分子電解質取代傳統的液態電解質,在經過一個月後,還保有80%以上的效率,在添加入DBS後成為膠態電解質,染敏太陽能電池光電轉化效率保持穩定。
    We study the organogels of structure, rheology and thermal Properties by 1,3:2,4 -Dibenzylidene sorbitol(DBS) to different molecular weight and different end groups of poly(ethylene glycol)(PEG). The PEG of different end groups are poly(ethylene glycol) dimethyl ether (PEGdme), poly(ethylene glycol) methyl ether acrylate (PEGmea), poly(ethylene glycol) diglycidyl ether (PEGdce). Then we study the polymer electrolyte of conductive properties by add the lithium iodine (LiI) and iodine (I2) to the DBS/PEG organogel and the efficiency and time stability in dye-sensitized solar cell.
    By POM anysis, we found the spherulite-like structure. When the DBS concentration rises,the unmbers of the spherulite-like structure increase. When the DBS concentration is fixed, the unmbers of the spherulite-like structure increase with the increase of molecular weight. The numbers of the spherulite-like structure increase because the end groups of OH are substituted into the different end groups. By rheology anysis, we found the storage modulus(G’) and the loss modulus(G”) of organogel are the same in frequency sweep,therefore we confirm that are gel. The different end groups of PEG also effect the gel dissolution temperature(Td), gel formation temperature(Tf), gel formation time. When the DBS concentration rises, the gel melting heat incrase. When the DBS concentration is fixed, the gel melting heat incrase with the increase of molecular weight. The gel dissolution temperature(Td) and gel formation temperature(Tf) descend order of PEGmea, PEGdme, PEGdce, PEG400, and the gelation time is relatively short. By IR and UV anysis, we can understand the self-assembly behavior of DBS. If the hydrogen bonding of self-assembly is greater, the pi-pi interaction force is relative greater.
    From the electrical properties of PEG electrolyte analysis, we found the ionic conductivity of PEG electrolyte decrease with the increase of molecular weight. The ionic conductivity of PEG electrolyte descend order of PEGdme, PEGmea, PEEG400, PEGdce.Using the PEG electrolyte to place traditional liquid electrolyte, the dye sensitized solar cells’s photoelectric conversion efficiency retain more than 80% efficiency during a month. When using the gel electrolyte by add DBS to PEG electrolyte, the dye sensitized solar cell’s conversion efficiency is stable during a month.
    Appears in Collections:[化學工程與材料工程學系暨研究所] 學位論文

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