| 摘要: | 本論文自含有鋁、鉻、鋅等單一雜質之模擬回收氮化鎵，配置成硝酸鹽前驅溶液，利用溶膠凝膠法合成固態氧化物電解質鑭鍶鎵鎂(La0.8Sr0.2Ga0.8Mg0.2O3-δ, 簡稱LSGM)。首先探討前驅溶液在不同pH值(pH = pristine、6、7、8)下對製備LSGM所得晶體結構之影響。由XRD分析得知: 前驅溶液pH值為7時，比在其他酸鹼值(pH = pristine、6、8)下，溶膠凝膠法可以獲得較佳，不含二次相之鈣鈦礦結構LSGM。以此LSGM為電解質來製作對稱電池，在800oC時之最高效能為48.1 mW/cm2。若LSGM含有鋁、鉻、鋅等單一雜質(M = Al、Cr、Zn)時，電解質La0.8Sr0.2Ga0.8Mg0.2-xMxO3-δ 中，M 雜質在 x=0.01、0.05、0.10、0.15 一系列濃度下改變，其對晶體結構與性質也有明顯之影響。鋁雜質縱使含量低至1 mol%，已大幅降低LSGM電解質性能；至於鋅與鉻雜質則可提高電解質之離子電導率，含1 mol%鋅(Z001)與含1、5 mol%鉻(C001、C005)之電解質離子電導率分別為0.136 、0.112、 0.110 S /cm，相較純LSGM(0.107 S/cm)有所增加。Z001在製作成對稱電池後進行性能測試結果顯示在操作溫度800oC擁有最高之功率密度70.2mW/cm2，較原來提升了近46%；而C001及C005在800oC時最高功率密度為57.4 mW/cm2及56.1 mW/cm2，也均較LSGM增加近20%。Z001、C001與C005電解質阻抗分別為2.17Ωcm2、2.73 Ωcm2以及2.76 Ωcm2，均優於LSGM之2.83 Ω。最後將本研究最佳參數Z001製備成陽極支撐型全電池，於800oC時最高功率密度為185.1mW/cm2。;In this study, the simulated recovery of gallium nitride containing single impurities such as aluminum, chromium, zinc, etc., is configured as a nitrate precursor solution, and the solid oxide electrolyte La0.8Sr0.2Ga0.8Mg0.2O3-δ (Referred to as LSGM) is synthesized by the sol-gel method. First, discuss the influence of the precursor solution on the crystal structure of LSGM under different pH values (pH = pristine, 6, 7, 8). According to XRD analysis, when the pH of the precursor solution is 7, the sol-gel method can obtain a better perovskite structure than other pH values (pH = pristine, 6, 8). Using LSGM as the electrolyte to prepare the symmetrical cell, the highest power density at 800oC is 48.1 mW/cm2. Suppose LSGM contains single impurities such as aluminum, chromium, and zinc (M = Al, Cr, Zn), in the electrolyte La0.8Sr0.2Ga0.8Mg0.2-xMxO3-δ, the M impurity is at x=0.01, 0.05, 0.10, 0.15 in a series of concentrations also have apparent effects on the crystal structure and properties. Even though the content of aluminum impurities is as low as one mol%, the performance of LSGM electrolyte has been dramatically reduced. As for zinc and chromium impurities, the ionic conductivity of the electrolyte can be improved, containing one mol% zinc (Z001) and 1, 5 mol% chromium (C001, C005), the ionic conductivity of the electrolyte was 0.136, 0.112, and 0.110 S/cm, respectively, which is higher than that of pure LSGM (0.107 S/cm). The performance results of Z001 after being made into a symmetrical cell show that it has the highest power density of 70.2 mW/cm2 at an operating temperature of 800oC, which is an increase of 46%; while the highest power density of C001 and C005 at 800oC is 57.4 mW/cm2 and 56.1 mW/cm2, also increased by nearly 20% compared with LSGM. The electrolyte impedances of Z001, C001, and C005 are 2.17 Ωcm2, 2.73 Ωcm2, and 2.76 Ωcm2, respectively, which are better than an impedance of LSGM (2.83 Ωcm2). Finally, the best parameter Z001 in this study was prepared into an anode-supported cell, and the highest power density was 185.1 mW/cm2 at 800oC. |
