LSM溶胶浸渍LSCF-GDC三相复合阴极制备及性能研究

doi:10.15541/jim20150617

摘要/Abstract

摘要：

高性能阴极是提高SOFC电池性能的关键因素。为了提高阴极电化学性能和降低阴极极化阻抗, 本实验将Pechini法制备的LSM(La_0.85Sr_0.15MnO₃)溶胶浸渍到LSCF(La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ)-GDC(10GDC)多孔阴极中, 构成LSM-LSCF-GDC三相复合阴极。为了提高浸渍效率, 研究了不同pH下LSM浸渍液的浸渍情况, 研究发现: LSM浸渍液的pH是影响浸渍效果和浸渍量的直接因素。当LSM浸渍液为弱碱性时, 络合物胶体粒子带负电, 而LSCF-GDC的孔洞内壁带大量的负电, 这样使得两者间的主要作用力为排斥力, 有利于LSM胶体粒子进入阴极的孔洞内部。当LSM浸渍液pH为8.0时, 生成的LSM纳米颗粒能较均匀地分布在阴极骨架内壁, 随着浸渍次数的增加, 阴极的极化阻抗先减后增, 浸渍3次的复合阴极具有最低极化阻抗0.16 Ω•cm²(700℃空气中)。在700℃下, 以H₂+3% H₂O为燃料、空气为氧化气体, 浸渍与未浸渍的电池的最大功率密度分别为0.645 W/cm²和0.503 W/cm²。

关键词: 溶胶浸渍法, 固体氧化物燃料电池, 三相复合阴极, pH

Abstract:

The cathode with high performance is a key factor to improve the electrochemical properties of SOFC. In order to increase the electrochemical properties and reduce the polarization impedance of the cathode, LSCF (La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ)-GDC(10GDC) porous cathode was dipped by the LSM(La_0.85Sr_0.15MnO₃) sol which was prepared via Pechini method, and then the LSM-LSCF-GDC three-phase composite cathode was constituted after calcinations. To improve the efficiency of impregnation, LSM sol with different pH was used to impregnate. The pH of LSM sol was the most important factor which affected impregnated effect and amount of impregnation. The complex colloid particles was negatively charged when LSM sol appeared weak alkaline. Meanwhile, a large number of negative charges was existing on LSCF-GDC hole inner wall, indicaing the repelling force was the main force between the colloid particles and hole wall, helpful to the LSM colloid particles impregnate into the inside hole of the cathode. The results showed that the generated LSM nano particles could be evenly distributed on the inner wall of the cathode skeleton when the pH of LSM sol was equal to 8.0. Cathode polarization impedance increased firstly and then reduced with the increase of impregnation times. The composite cathode impregnated in LSM sol for 3 times attained the minimum polarization impedance of 0.16 Ω•cm² (700℃in the air). The maximum power densities of impregnated and un-impregnated cells were 0.645 W/cm² and 0.503 W/cm², respectively, at the working temperature of 700℃, using 3% H₂+H₂O as fuel and air as oxidizing gas.

Key words: sol impregnated method, solid oxide fuel cell, three-phase composite cathode, pH

中图分类号:

TQ174

罗凌虹, 林囿辰, 石纪军, 程亮, 吴也凡, 孙良良. LSM溶胶浸渍LSCF-GDC三相复合阴极制备及性能研究[J]. 无机材料学报, 2016, 31(7): 756-760.

LUO Ling-Hong, LIN You-Cheng, SHI Ji-Jun, CHENG Liang, WU Ye-Fan, SUN Liang-Liang. Preparation and Properties of Three-phase Composite Cathode of LSCF-GDC Dipped LSM Sol[J]. Journal of Inorganic Materials, 2016, 31(7): 756-760.

图/表 7

图1 LSCF-GDC复合阴极表面背散射SEM照片

Fig. 1 Back scattering SEM image of the surface of LSCF- GDC composite cathode

图2 LSCF-GDC阴极浸渍LSM前后和不同pH浸渍试样的SEM照片

Fig. 2 SEM images for the different pH value on the impregnation of LSM to LSCF-GDC cathode (a) Porous skeleton of LSCF-GDC cathode; sample dipped by LSM sol with pH of (b) 6.0, (c) 7.0 and (d) 8.0

图3 LSM-LSCF-GDC三相阴极的XRD图谱

Fig. 3 XRD pattern of LSM-LSCF+GDC three-phase composite cathode

图4 浸渍次数与浸渍量的关系

Fig. 4 Relationship between impregnation times and infiltrated quantity

图5 不同浸渍次数的阴极SEM照片

Fig. 5 SEM images of cathode with different infiltrated times Infiltration of (a) once, (b) twice, (c) three times, and (d) four times

图6 不同浸渍次数的阴极极化阻抗

Fig. 6 Polarization impedance of cathode with different infiltrated times

图7 浸渍前后电池的I-V和I-P曲线

Fig. 7 I-V and I -P curves of fuel cell with and without infiltration

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