BaZr0.1Co0.4Fe0.4Y0.1O3-SDC composite as quasi-symmetrical electrode for proton conducting solid oxide fuel cells
BaZr0.1Co0.4Fe0.4Y0.1O3-SDC composite as quasi-symmetrical electrode for proton conducting solid oxide fuel cells
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DOI：
10.1016/j.ceramint.2020.01.215
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发表时间：
2020-06
影响因子：
5.2
通讯作者：
Yingqin Yu;Lixiang Yu;K. Shao;Yihang Li;K. Maliutina;W. Yuan;Qixing Wu;L. Fan
中科院分区：
文献类型：
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作者：
Yingqin Yu;Lixiang Yu;K. Shao;Yihang Li;K. Maliutina;W. Yuan;Qixing Wu;L. Fan
对称固体氧化物燃料电池(SSOFC)具有相同的阳极和阴极电催化剂，在延长电池寿命的同时，有望降低材料和系统成本。本文提出了BaZr0.1Co0.4Fe0.4Y0.1O3(BZCFY)氧化物钙钛矿作为质子导电电解液作为固体氧化物燃料电池的对称电极，以降低温度和高性能应用为目标。将活性氧离子导体和催化剂SDC复合，以提高电池性能和电极寿命。当BZCFY分解为合金和混合氧化物复合材料时，这些材料表现出良好的化学相容性，这对电极活性有很大影响。在70 0~5 5 0℃的温度范围内，SDC-BZCFY复合材料在质子导电电解液BZCY上的氢氧化反应和氧还原反应的电极极化电阻分别为1 35~13 7Ω·cm2和0 32~1 59Ω·cm2。此外，它还表现出良好的氧还原动力学，其活化能为0.91 eV。由于开路条件下的电化学促进作用，燃料电池条件下的极化电阻显著降低。BZCY电解液厚度为480μm、电极厚度为25μm的准固体氧化物燃料电池在650℃和600℃时的峰值功率密度分别为114.8和74.3W/cm−。此外，SSOFC在25h的恒压工作条件下也表现出可接受的耐久性。这项工作突出了用于低温运行的对称固体氧化物燃料电池的替代活性电极材料。
Symmetric solid oxide fuel cells (SSOFCs) with the identical anode and cathode electrocatalysts show promise to reduce material and system cost while increasing the cell lifespan. In this work, BaZr0.1Co0.4Fe0.4Y0.1O3(BZCFY) oxide perovskite is proposed as a symmetric electrode for SSOFCs based on proton conducting electrolyte, with targets of reducing temperature and high-performance application. Active oxygen ionic conductor and catalyst, SDC, is composited to improve the cell performance and electrode durability. Those materials show good chemical compatibility while BZCFY is decomposed to alloy and mixed oxide composite, which significantly affects electrode activity. SDC-BZCFY composite gives an electrode polarization resistance of 1.35–13.7 Ω cm2and 0.32–1.59 Ω cm2for hydrogen oxidation reaction and oxygen reduction reaction on the proton conducting electrolyte, BZCY, at the temperature range of 700–550 °C, respectively. Moreover, it displays an excellent oxygen reduction kinetics with an impressive activation energy of 0.91 eV. The polarization resistances are significantly reduced in the fuel cell condition owning to the electrochemical promotion effect under open-circuit condition. Quasi-SSOFCs with BZCY electrolyte in a thickness of 480 μm and electrode thickness of 25 μm give a peak power density of 114.8 and 74.3 mW cm−2at 650 and 600 °C, respectively. In addition, SSOFC also displays acceptable durability under constant voltage operational condition for 25 h. This work highlights alternative active electrode material for symmetric solid oxide fuel cells for low temperature operation.