2020
DOI: 10.3866/pku.whxb202011009
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Identification of Electrode Process in Large-size Solid Oxide Fuel Cell

Abstract: Solid oxide fuel cell (SOFC) with high energy conversion efficiency, low pollutant emission, and good fuel adaptability has witnessed rapid development in recent years. However, the commercialization of SOFC remains limited by constraints of performance and stability. Electrochemical impedance spectroscopy (EIS) can distinguish ohmic impedance caused by ion transport from polarization impedance related to electrode reaction; it has been widely used in the research of performance and stability as an efficient o… Show more

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Cited by 12 publications
(7 citation statements)
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“…The ORR process contains multielementary steps, including gas diffusion from the mainstream to the electrode surface, chemical adsorption, dissociation, charge transfer, and bulk ionic transportation to the electrolyte/electrode interface. So, to clarify the substeps involved in the whole ORR, the EIS of symmetric cells were tested at different oxygen pressures ( P O 2 ), and the results are shown in Figure a,c; the resulted EIS are deconvoluted using the distribution of relaxation times (DRT) method considering different relaxation times of elementary steps (Figure b,d). Similar to temperature depending on EIS response, the ASR decreases with the increased oxygen partial pressure.…”
Section: Resultsmentioning
confidence: 99%
“…The ORR process contains multielementary steps, including gas diffusion from the mainstream to the electrode surface, chemical adsorption, dissociation, charge transfer, and bulk ionic transportation to the electrolyte/electrode interface. So, to clarify the substeps involved in the whole ORR, the EIS of symmetric cells were tested at different oxygen pressures ( P O 2 ), and the results are shown in Figure a,c; the resulted EIS are deconvoluted using the distribution of relaxation times (DRT) method considering different relaxation times of elementary steps (Figure b,d). Similar to temperature depending on EIS response, the ASR decreases with the increased oxygen partial pressure.…”
Section: Resultsmentioning
confidence: 99%
“…电池两侧 采用银网集流, 并从两侧端板上引出电流引线和电压引 线, 连接至电子负载(Itech IT8514C+)和电化学工作站 (Zahner Zennium), 从而测试电池的电化学性能. 电池 密封及接线等具体测试方法可参考本课题组之前的工 作 [36][37] .…”
Section: 电池阳极安全运行条件unclassified
“…目前已经建立的 EIS 解析方法包括等效电路拟合法 (ECM)、 阻抗差异分析法(ADIS)、 弛豫时间分布法(DRT) 等. 在本课题组之前的工作中, 已经通过 DRT/ECM 方 法实现了对纽扣电池 [8] 、工业大尺寸电池 [9] 中各项电极 过程的分辨, 并在此基础上基于带载 EIS 解析初步研究 了电池性能演变机制 [10] . 广泛的实验测试结果表明, SOFC 在运行初期(约前 100 h)的性能演变最为显著和复 杂: 部分电池的性能在这一阶段迅速降低 [10][11] , 也有部 分电池的性能在这一阶段先有所上升、之后逐渐降 低 [12][13] .…”
Section: 引言unclassified
“…本工作采用实 验室自编程软件进行 DRT 分析, 基本算法为 Tikhonov 正则化方法, 选取正则化因子为 0.001. 基于本课题 组 [8][9] 及其他研究机构 [28][29] 对相同结构电池的敏感性分 析实验结果, DRT 中各特征峰与电极过程的对应关系已 基本明确, 如表 1 所示. 表 1 DRT 中各特征峰对应的电极过程 Table 1 The electrode process corresponding to each characteristic peak in DRT Peak…”
Section: 引言unclassified
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