GNP法之反應機制探討以合成中溫型固態氧化物燃料電池陰極材料為例

Synthesis mechanism of Glycine-Nitrate Process, taking IT-SOFC cathode material as an example

林盈甫(Ying-Fu Lin)

指導教授 ： 余炳盛

國立臺北科技大學/工程學院/資源工程研究所/碩士(2010年)

https://doi.org/10.6841/NTUT.2010.00473

摘要

目前固態氧化物燃料電池(Solid Oxide Fuel Cell ,SOFC)廣受注目，如何製備其電極或電解質材料為重要的課題之一。其中Glycine-Nitrate Process(GNP法)具備了多項優點，故以此法合成適當成分的奈米陶瓷氧化物粉末以應用在SOFC被廣泛的使用。此法主要是依賴甘胺酸的胺基和羧基來與硝酸鹽類錯合，但當改變實驗其中的參數，例如甘胺酸與金屬硝酸鹽類的比例或pH值，是否會造成其鍵結的程度改變進而影響到最終的產物以及內部更詳細的反應機制並未完全了解，故本研究希望能對其進行深入的探討。
本研究嘗試在不同的G/M比及pH之條件進行BSCuF粉末之合成，使用紅外光譜、拉曼光譜及TG-DTA熱分析對於前驅物進行檢測，並輔以XRD觀察產物之結晶相，以了解甘胺酸之解離情形與產物成相性之關係
由紅外光譜及XRD結果可得知欲合成BSCuF鈣鈦礦相粉末，凝膠狀前驅物中羧酸群必須要有良好的解離能力，以利其與金屬陽離子錯合，否則將無法獲得純鈣鈦礦相之產物；而藉由拉曼光譜之測量可得知在低pH值時，甘胺酸之胺基端將由原本NH2轉變為NH3+，但此轉變行為對於純相產物之合成並無幫助。

關鍵字

溶液燃燒法 ； 固態氧化物燃料電池 ； 陰極

並列摘要

ABSTRACT
Title：Synthesis mechanism of Glycine-Nitrate Process, taking IT-SOFC cathode material as an example NO. of Pages：98
School：National Taipei University of Technology
Department：Institute of Mineral Resources Engineering
Time：June 2010 Degree：Master
Researcher：Ying-Fu Lin Advisor：Dr. Bing-Sheng Yu

Keywords：solution combustion、SOFC、cathode
As a leading system of the rapidly growing technology that coverts chemical energy directly into electricity and heat with high efficiency and low pollution rates, solid oxide fuel cells (SOFC) has received extensive attention in recent years. How to develop electrode or electrolyte materials of SOFC has accordingly become an issue of mounting importance. Thanks to its various advantages, the glycine-nitrate process (GNP) has been widely used in the SOFC field to synthesize appropriate components of nano ceramic oxide powders. At the core of the GNP method is the use of the two major functional groups of glycine structure - the amine group and the carboxylic group – to form complexness with metal carbonate by complex reactant. However, the particular mechanism of inside reactant has not been fully comprehended, and there have not been many studies to explore how changing the experiment parameters, such as the ratio of glycine to metal carbonate (G/M ratio) or the pH value of solution precursor, may change the complex degree of glycine and lead to negative effects on the final product. The paper thus endeavors to perform an in-depth study on these issues.
In this study, BSCuF powders are synthesized at different G/M ratios and pH values, the precursor examined by IR spectrum, Raman spectrum and TG-DTA devices, and XRD used to examine the product’s lattice phase and the resultants of the precursor and the product so as to understand the relation between the dissociation degree of glycine and product phase.
Based on the IR and XRD results, the carboxylic group of glycine needs to have a substantial dissociation degree in gel precursor in order to promote the complex degree of glycine and metal ions and to synthesize BSCuF powders that has a pure perovskite phase. As indicated by the Raman results, at a low pH value, the amine group of glycine in solution precursor changes from NH2 to NH3+; this change, however, does not help promote the crystllization phase of the product.

並列關鍵字

solution combusion ； SOFC ； cathod

參考文獻

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