Bi-doped La1.5Sr0.5Ni0.5Mn0.5O4+δ as an efficient air electrode material for SOEC
Bi-doped La1.5Sr0.5Ni0.5Mn0.5O4+δ as an efficient air electrode material for SOEC
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DOI：
10.1016/j.ijhydene.2021.08.144
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发表时间：
2021-09
影响因子：
7.2
通讯作者：
Huaguo Jiang;Zeming Lu;B. Qian;Shun Wang;B. Yin;Yifeng Zheng;Lin Ge;Han Chen;Caizhi Z. Zhang
中科院分区：
文献类型：
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作者：
Huaguo Jiang;Zeming Lu;B. Qian;Shun Wang;B. Yin;Yifeng Zheng;Lin Ge;Han Chen;Caizhi Z. Zhang
研究了Bi掺杂的La1.5-xBixSr0.5Ni0.5Mn0.5O4+δ（LBSNM-x，x = 0，0.05，0.1，0.15）作为固体氧化物电解电池（SOEC）的潜在空气电极。研究了Bi掺杂对材料结构、电导率、与GDC电解质的化学相容性、电化学性能和热膨胀系数的影响。XRD表征结果表明，Bi的固溶体含量小于等于0.1。XPS表征结果表明，Bi的掺杂增加了LBSNM-x空气电极的氧空位含量，有利于其析氧反应。在Bi掺杂样品中，LBSNM-0.1电极具有最好的电化学性能，基于LBSNM-0.1/GDC半电池，其在800 °C下的最低Rp（极化电阻）为0.28 Ω cm 2。LBSNM-0.1单电池在燃料电极上具有70%CO2+ 30%CO燃料气体进料，在800 °C和1.4 V下实现了811 mA cm-2的电流密度，相对于LSNM单电池增加了62.2%。此外，LBSNM-0.1单电池在800 °C和1.3V下在燃料电极上具有70%C02 + 30%C0进料气体时表现出优异的稳定性。这些结果证明Bi掺杂的LBSNM-0.1是用于SOEC的有效空气电极。
Bi-doped La1.5-xBixSr0.5Ni0.5Mn0.5O4+δ(LBSNM-x, x = 0, 0.05, 0.1, 0.15) was investigated as a potential air electrode for solid oxide electrolysis cell (SOEC). The effect of Bi doping on the structure, electrical conductivity, chemical compatibility with GDC electrolyte, electrochemical performance and thermal expansion coefficients (TECs) were investigated. XRD characterization results show that the solid solution content of Bi is less than or equal to 0.1. XPS characterization results indicate that Bi doping increases the oxygen vacancy content of LBSNM-x air electrode and thus greatly benefits its oxygen evolution reaction. Among the Bi-doped samples, LBSNM-0.1 electrode has the best electrochemical performance with its lowest Rp (polarization resistance) of 0.28 Ω cm2at 800 °C based on LBSNM-0.1/GDC half-cell. LBSNM-0.1 single cell with 70%CO2+ 30%CO fuel gas feed on the fuel electrode has achieved current density of 811 mA cm−2at 800 °C and 1.4 V, a 62.2% increase relative to that of LSNM single cell. In addition, LBSNM-0.1 single cell exhibits excellent stability at 800 °C and 1.3 V with 70%CO2+ 30%CO feed gas on the fuel electrode. These results prove that Bi-doped LBSNM-0.1 is an efficient air electrode for SOEC.