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首页> 外文期刊>RSC Advances >Oxygen permeation, thermal expansion behavior and electrochemical properties of LaBa0.5Sr0.5Co2O5+delta cathode for SOFCs
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Oxygen permeation, thermal expansion behavior and electrochemical properties of LaBa0.5Sr0.5Co2O5+delta cathode for SOFCs

机译：氧气渗透，热膨胀行为和Laba0.5CO2O5 + Delta阴极的电化学性能的SOFC

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摘要

In this study, the double perovskite LaBa0.5Sr0.5Co2O5+delta (LBSC55) is investigated as a potential cathode for solid oxide fuel cells (SOFCs). In the curve of the first derivative delta L vs. temperature, there is an inflection region ranging from 230 to 330 degrees C. The peak inflection point located about 260 degrees C is associated with the initial temperature for the loss of lattice oxygen and the formation of oxygen vacancies. The concentration of Co4+ ions in LBSC55 decreased significantly above 260 degrees C due to the loss of lattice oxygen (Co4+ -> Co3+) and creation of V-O '' at the same time. The electrical conductivity exhibited a metallic behavior with values that gradually decreased from 232 S cm(-1) at 400 degrees C to 178 S cm(-1) at 800 degrees C. The chemical bulk diffusion coefficient (D-chem) values of LBSC55 are 1.49 x 10(-4), 2.75 x 10(-4) and 5.37 x 10(-4) cm(2) s(-1) at 700 degrees C, 750 degrees C and 800 degrees C, respectively. The oxygen permeation flux for LBSC55 membrane with 1.0 mm thickness increased from 0.210 mL min(-1) cm(-2) at 500 degrees C to 0.302 mL min(-1) cm(-2) at 800 degrees C under synthetic air at a flow rate of 50 mL min(-1), with helium at a rate of 25 mL min(-1). The activation energies of oxygen permeation for the high temperature region (750-800 degrees C) and low temperature region (500-700 degrees C) are 10.60 and 2.75 kJ mol(-1), respectively. This suggested that the surface exchange process is dominant above 750 degrees C and at low temperature ranges the bulk diffusion process is dominant for oxygen ion diffusion. The main process of the oxygen reduction reaction is dominated by oxygen ion transfer from TPB and/or 2PB sites of the cathode to electrolyte in the temperature range of 600-800 degrees C. Based on the chemical bulk diffusion coefficient, oxygen permeation and electrochemical properties, LBSC55 is a potential cathode for solid oxide fuel cells (SOFCs).
机译：在这项研究中，双钙钛矿LaBa0.5Sr0.5Co2O5 + DELTA（LBSC55）进行了研究，作为固体氧化物燃料电池（SOFC）的电势的阴极。在一阶导数增量L比温度的曲线，有范围从230至位于约260摄氏度与用于晶格氧和地层的损失初始温度相关联的330度C.峰拐点的拐点区域的氧空位。 CO4 +离子在LBSC55浓度高于260摄氏度显著降低由于晶格氧的损失（CO4 + - >的Co 3+）在同一时间和创建的V-O“”。电导率表现出与值的金属特性逐渐从232章第厘米（-1）在400℃下在800℃的化学体扩散系数（d-CHEM）LBSC55的值降低到178小号厘米（-1）是1.49×10（-4），2.75×10（-4）和5.37×10（-4）厘米（2）S（-1）分别700摄氏度，750摄氏度和800摄氏度，。对于LBSC55膜的氧渗透通量用1.0毫米的厚度从0.210毫升分钟上升（-1）厘米（-2），在500摄氏度至0.302毫升分钟（-1）厘米（-2）在800℃下合成空气下，在在25毫升min的速率的50毫升分钟（-1），用氦气流量（-1）。对于高温区（750-800℃）和低温区域透氧的活化能（500-700℃）是10.60和2.75千焦耳摩尔（-1），分别。这表明，表面交换过程是高于750℃，在低温下占主导地位的范围内的体积扩散过程是占主导地位的氧离子扩散。氧还原反应的主要过程由TPB和/或阴极的2PB站点氧离子转移到电解质中的温度范围600-800℃下基于化学整体扩散系数，氧渗透和电化学性质支配，LBSC55是用于固体氧化物燃料电池（SOFC）的电势的阴极。

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  • 来源
    《RSC Advances》 |2017年第24期|共9页
  • 作者

    Subardi Adi; Liao Kun-Yu; Fu Yen-Pei;

  • 作者单位

    Natl Dong Hwa Univ Dept Mat Sci &

    Engn Hualien 97401 Taiwan;

    Natl Dong Hwa Univ Dept Mat Sci &

    Engn Hualien 97401 Taiwan;

    Natl Dong Hwa Univ Dept Mat Sci &

    Engn Hualien 97401 Taiwan;

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  • 正文语种 eng
  • 中图分类 化学;
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