Ni浸渍的LST-SSZ复合阳极及其直接甲烷固体氧化物燃料电池研究

doi:10.15541/jim20140083

摘要/Abstract

摘要：

La_0.2Sr_0.8TiO₃ (LST) 对于直接甲烷为燃料的固体氧化物燃料电池而言是一种具有潜力的阳极材料。本研究采用传统的固相反应法合成了LST粉体, 按照质量比5: 5混合LST和Sc_0.1Zr_0.9O₂(SSZ)粉体, 以此复合阳极材料制备对称电池并测试其极化阻抗。在氢气气氛中700、750和800℃时阳极极化阻抗分别为5.3、3.0以及2.0 ?·cm²。鉴于LST的电导率较低, 我们通过浸渍工艺加入10wt%的Ni来提高复合阳极的电导率和催化活性, 复合阳极测得的极化阻抗明显减小。以10wt%Ni-LST-SSZ作为阳极材料制备出的阴极支撑型单电池, 其在氢气和甲烷中的最大功率密度分别可达到225 mW/cm²和175 mW/cm², 并且在甲烷燃料中放电时表现出了较好的稳定性。

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关键词: 浸渍, 复合阳极材料, 极化阻抗, 甲烷

Abstract:

Solid Oxide Fuel Cells (SOFCs) is one of the most attractive energy conversion devices because of their high efficiency, low pollution, and fuel flexibility. La_0.2Sr_0.8TiO₃ (LST) anode material shows its potential utilization in direct oxidation of methane fuel without carbon formation. In this paper, LST powders were synthesized by traditional solid-state method, and then mixed with scandia-stabilized zirconia (SSZ) in mass ratio of 5: 5 to prepare the composite anode materials. Symmetrical cells with LST-SSZ composite anode were fabricated and measured. Their polarization resistances in hydrogen at 700℃, 750℃ and 800℃ were 5.3, 3.0 and 2.0 ?·cm², respectively. Considering the insufficient conductivity of LST, 10wt%Ni was impregnated into the composite anode to improve the anode performance. The polarization resistance of the symmetrical cell with 10wt% Ni impregnation load is obviously reduced. The maximum power density of a cathode supported single cell with 10wt%Ni-LST-SSZ composite anode are 225 mW/cm² and 175 mW/cm² in hydrogen and in methane at 750℃, respectively, and the single cell shows its stability running in methane fuels.

Key words: impregnation, composite anode materials, polarization resistance, methane

中图分类号:

TM911

刘亚迪, 袁春, 周玉存, 邹杰, 辛显双, 王绍荣. Ni浸渍的LST-SSZ复合阳极及其直接甲烷固体氧化物燃料电池研究[J]. 无机材料学报, 2014, 29(11): 1121-1126.

LIU Ya-Di, YUAN Chun, ZHOU Yu-Cun, ZOU Jie, XIN Xian-Shuang, WANG Shao-Rong. Composite Anodes with Ni Impregnated LST-SSZ for Direct Methane Solid Oxide Fuel Cells[J]. Journal of Inorganic Materials, 2014, 29(11): 1121-1126.

图/表 9

图1 950℃、1200℃和1400℃合成和800℃还原后的 LST粉体的X射线衍射图谱

Fig. 1 XRD patterns of LST powders sintered at 950℃, 1200℃ and 1400℃, and reduced at 800℃ for 10 h

图2 LST在空气中的热膨胀曲线

Fig. 2 Thermal expansion behavior of LST samples in air

图3 LST在氢气氛下的电导率Arrhenius曲线

Fig. 3 Arrhenius plot of conductivity of LST sample in hydrogen

图4 LST-SSZ/YSZ/LST-SSZ阳极对称电池的阻抗谱图及波特图谱

Fig. 4 EIS and Bode plots of LST-SSZ/YSZ/LST-SSZ anode sym--metric cells

图5 LST-SSZ/YSZ/ LST-SSZ阳极对称电池的断面SEM照片

Fig. 5 SEM image of LST-SSZ/YSZ/LST-SSZ anode sym-metric cell

图6 10wt%Ni-LST-SSZ/YSZ/10wt%Ni-LST-SSZ阳极对称电池(a, b)在氢气气氛中和(c, d)在甲烷气氛中阻抗谱图及波特图谱

Fig. 6 EIS and Bode plots of 10wt%Ni-LST-SSZ/YSZ/10wt%Ni-LST-SSZ anode symmetric cells in (a, b) hydrogen and (c, d) methane

图7 测试后10wt%Ni-LST-SSZ/YSZ/10wt%Ni-LST-SSZ阳极对称电池的断面SEM形貌

Fig. 7 Cross-sectional SEM images of the anode in 10wt%Ni-LST-SSZ/YSZ/10wt%Ni-LST-SSZ anode symmetric cell after test

图8 10wt%Ni-LST-SSZ/SSZ/LSM-SSZ/LSM单电池的性能

Fig. 8 The performance of 10wt%Ni- LST-SSZ/SSZ/LSM- SSZ/ LSM single cell

图9 10wt%Ni-LST-SSZ/SSZ/LSM-SSZ/LSM单电池在甲烷燃料中的稳定性

Fig. 9 Performance stability of 10wt%Ni-LST-SSZ/SSZ/LSM- SSZ/LSM single cell running in methane fuel

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