Quantifying the performance evolution of solid oxide fuel cells during initial aging process

Lyu, Zewei; Liu, Shixue; Wang, Yige; Li, Hangyue; Liu, Zhijing; Sun, Zaihong; Sun, Kaihua; Zhang, Shuxing

doi:10.1016/j.jpowsour.2021.230432

Cited by 32 publications

(7 citation statements)

References 57 publications

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“…Our group has previously investigated systematically the initial degradation mechanisms of SOFC with H2-H2O mixture (16)(23) (24). It was found that the deterioration in the charge transfer reaction in fuel electrode was the main reason for the performance loss during initial operating duration (t<100 h).…”

Section: The Electrode Processes Identification and Comparison Of H2o...mentioning

confidence: 99%

A Comparative Study of the Performance and Electrode Processes of Solid Oxide H₂O Electrolysis and CO₂ Electrolysis

Liang¹,

Han²,

Ni³

2023

ECS Trans.

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Solid oxide CO2 electrolysis was less studied compared with H2O electrolysis and the relevant reaction mechanism and electrode processes were poorly understood. This paper investigated the performance and electrode processes differences between CO2 electrolysis and H2O electrolysis. The shape of j-V curves, electrochemical impedance spectroscopy data and calculated distribution relaxation time results were analyzed. It was found that the performance of CO2 electrolysis degraded the most compared with that in SOFC mode and for H2O electrolysis after a 65 h’ operation. Meanwhile, j-V curve of CO2 electrolysis changed a lot and finally showed a convex total resistance pattern with applied current. It was also found that the characteristic frequency of charge transfer reaction and diffusion process for CO2 electrolysis was much lower than that of H2O electrolysis. A thermal activated peak at 10-100 Hz which was not noted for H2O electrolysis was considered to be CO2 adsorption and dissociation process in fuel electrode. Besides, diffusion process for H2O-H2 and CO2-CO mixture also differed. Finally, it was indicated that the different performance degradation may be due to different suppressed degree of charge transfer reaction in fuel electrode for H2O electrolysis and CO2 electrolysis and additional suppressed adsorption or dissociation process of CO2 for CO2 electrolysis.

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Section: The Electrode Processes Identification and Comparison Of H2o...mentioning

confidence: 99%

A Comparative Study of the Performance and Electrode Processes of Solid Oxide H₂O Electrolysis and CO₂ Electrolysis

Liang¹,

Han²,

Ni³

2023

ECS Trans.

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“…Ni 颗粒的氧化不仅会导致阳极反应位点减少及阳极反应活性下降, 也可能导致传导电子的 Ni 连通网络断裂 [19] 和电池欧姆电阻增长 [20] , 这些都会造成电池性能的明显衰减. 在极端情况下, 氧化过程中 Ni 颗粒的体积膨胀可能会导致阳极或电解质开裂 [21][22][23] 2 , 在此基础上, 我们基于本课题组 [24] 所开发的电化学阻抗谱处理软件 EISART, 补偿了测试过程中电压引线与电流引线之间的互感对高频数据的影响, 得到欧姆电阻为 0.343 Ω•cm 2 . [15] , 从而导致电池的输出电压下降.…”

Section: 引言unclassified

“…考虑到电池的输出电压 U 是在阳极电势的基础上减去阴极极化损失和欧姆极化损失, 因此当电压 U 高于电池的阳极支撑层和阳极功能层为 NiO-YSZ, 电解质为 YSZ, 隔离层为 GDC (Gd 0.1 Ce 0.9 O 2-δ ), 阴极为 LSCF (La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ ). 电池的各层厚度及详细制备工艺流程可参考本课题组之前的工作 [24,[35][36] . 将制备好的电池装入端板后在温控电阻炉中进行测试, 阳极侧通入氢气, 阴极侧通入空气, 气体供应均由质量流量计(Sevenstar CS200A)进行控制.…”

Section: 电池阳极安全运行条件unclassified

“…电池在 720 ℃、阳极 1 L•min -1 (101.325 kPa, 0 ℃ 下体积, 下同)的氢气(以体积分数为 10%的水蒸气加湿), 阴极气氛为 3 L•min -1 空气的条件下还原 5 h. 之后在该条件下 10 A 恒流放电 48 h, 完成初期性能活化 [24,[35][36] , 进入稳定状态. 在对电池进行基本性能测试后, 开展探究电池效率的变工况测试.…”

Section: 电池阳极安全运行条件unclassified

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Study of Operating Conditions for High Efficiency and Anode Safety of Industrial-Size Solid Oxide Fuel Cell

Wang¹,

Li²,

Lyu³

et al. 2022

Acta Chimica Sinica

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Solid oxide fuel cell (SOFC) has been regarded as one of the promising energy conversion technologies since it provides higher efficiency and lower pollution than conventional power systems. How to improve the SOFC efficiency is one of the focus issues in both industry and academia. Besides, when industrial-size SOFC is operated at high fuel utilization (Ufuel) to achieve high efficiency, the Ni anode in the downstream region may be locally oxidized due to the high oxygen partial pressure. Thus, operating conditions for both high efficiency and anode safety are required. In this work, a method for the measurement and evaluation of SOFC efficiency was established. By comparing the test results under different conditions (current, fuel flow rate, and temperature) with high fuel utilization, it was found that at the same fuel utilization, the voltage decreased as the current increased. Therefore, the lower current is beneficial for higher efficiency, while the higher current is beneficial for higher power. The relationship between voltage fluctuation and local oxidation of anode during operation at high fuel utilization was also studied. After analyzing the critical condition of Ni oxidation, the cell output voltage higher than the critical electromotive force of Ni oxidation was proposed as the safe operating condition to prevent local oxidation of anode. Based on the cell samples and test parameters used in this work, it was found a high efficiency of over 50% was corresponding to the fuel utilization range of 77% to 90%. And the maximum electrical efficiency was always corresponding to Ufuel＝87.10%. Although the operating conditions corresponding to the maximum efficiency of SOFC cells or stacks with different materials, structures, and fabrication processes may vary, the measurement and evaluation methods, as well as the judgment of the safe operating condition proposed in this study, are still helpful. In practical application, the operating conditions could be determined based on such testing results according to the importance of efficiency, power and long-term stability. Keywords solid oxide fuel cell; high efficiency; high fuel utilization; local oxidation of anode; safe operating condition

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“…However, complex threedimensionality made it difficult to study the microstructural evolutions. [29][30][31] Two-dimensional (2-D) patterned electrodes with well-defined geometries are expected to overcome this problem. Jiao and Shikazono 32 observed 100 μm size patterned electrodes with well-defined TPB by a confocal laser scanning microscope (CLSM), and found that Ni migration is unsteady and dynamic at the active TPB during fuel cell operation.…”

mentioning

confidence: 99%

Influence of Transition Metal Elements on Ni Migration in Solid Oxide Cell Fuel Electrodes

Ouyang,

Sciazko,

Komatsu

et al. 2023

J. Electrochem. Soc.

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In the present study, the electrochemical performance and microstructure evolutions of Ni-M (M = Fe, Cu, Mn) bimetallic fuel electrodes were investigated under SOFC and SOEC operations. Ni-Fe, Ni-Mn, Ni-Cu and pure Ni patterned fuel electrodes were sputtered on YSZ pellets. During the SOFC tests, the electrochemical performance of all Ni-M bimetallic fuel electrodes were lower than pure Ni electrode, while the degradation rates of Ni-Fe and Ni-Mn electrodes were smaller than the others. The spreading of Ni film on YSZ surface was observed for all samples, and such Ni migration was suppressed by Fe and Mn addition, whereas it was enhanced by Cu addition. During the SOEC tests, the cell performance degraded with Cu and Fe addition, but improved with Mn addition. The adhesion between Ni film and YSZ substrate was enhanced by doping Fe and Mn, which correlated well with the inhibited degradation in both fuel cell and electrolysis operations. The Ni migration phenomenon is discussed by the strength of Ni-O bond, surface tension and melting point, which are influenced by the addition of transition metal elements.

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Quantifying the performance evolution of solid oxide fuel cells during initial aging process

Cited by 32 publications

References 57 publications

A Comparative Study of the Performance and Electrode Processes of Solid Oxide H₂O Electrolysis and CO₂ Electrolysis

A Comparative Study of the Performance and Electrode Processes of Solid Oxide H₂O Electrolysis and CO₂ Electrolysis

Study of Operating Conditions for High Efficiency and Anode Safety of Industrial-Size Solid Oxide Fuel Cell

Influence of Transition Metal Elements on Ni Migration in Solid Oxide Cell Fuel Electrodes

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Quantifying the performance evolution of solid oxide fuel cells during initial aging process

Cited by 32 publications

References 57 publications

A Comparative Study of the Performance and Electrode Processes of Solid Oxide H2O Electrolysis and CO2 Electrolysis

A Comparative Study of the Performance and Electrode Processes of Solid Oxide H2O Electrolysis and CO2 Electrolysis

Study of Operating Conditions for High Efficiency and Anode Safety of Industrial-Size Solid Oxide Fuel Cell

Influence of Transition Metal Elements on Ni Migration in Solid Oxide Cell Fuel Electrodes

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A Comparative Study of the Performance and Electrode Processes of Solid Oxide H₂O Electrolysis and CO₂ Electrolysis

A Comparative Study of the Performance and Electrode Processes of Solid Oxide H₂O Electrolysis and CO₂ Electrolysis