Enhanced cathodic activity by tantalum inclusion at B-site of La0.6Sr0.4CO0.4Fe0.6O3 based on structural property tailored via camphor-assisted solid-state reaction
Enhanced cathodic activity by tantalum inclusion at B-site of La0.6Sr0.4CO0.4Fe0.6O3 based on structural property tailored via camphor-assisted solid-state reaction
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DOI：
10.1007/s40145-022-0627-x
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发表时间：
2022-07
影响因子：
16.9
通讯作者：
Deyi Xiong;Sefiu A. Rasaki;Yangpu Li;L. Fan;Changyong Liu;Zhangwei Chen
中科院分区：
文献类型：
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作者：
Deyi Xiong;Sefiu A. Rasaki;Yangpu Li;L. Fan;Changyong Liu;Zhangwei Chen
镧锶钴铁氧体（LSCF）是固体氧化物燃料电池（SOFC）的重要阴极材料，由于其优异的热稳定性和化学稳定性而得到广泛的研究。然而，其较差的氧还原反应（ORR）活性，特别是在约800 °C的温度下，导致实现> 1.0 W·cm-2的峰值功率密度的挫折，限制了其在SOFC商业化中的应用。为了提高LSCF的ORR，已经发现掺杂策略是有用的。本文中，多孔钽掺杂的LSCF材料（La0.6Sr0.4Co0.4Fe0.57Ta0.03O3（LSCFT-0）、La0.6Sr0.4Co0.4Fe0.54Ta0.06O3和La0.6Sr0.4Co0.4Fe0.5Ta0.1O3）通过烧结辅助固相反应（CSSR）制备。LSCFT-0材料表现出良好的ORR，在600、650、700、750和800 C下的面积比电阻（ASR）分别为1.260、0.580、0.260、0.100和0.06 Ω·cm 2。其性能比未掺杂的La0.6Sr0.4Co0.4Fe0.6O3提高约2倍，从最低温度到最高温度的ASR分别为2.515、1.191、0.596、0.320和0.181 Ω·cm 2。通过材料表征，发现掺入的Ta占据了材料的B位，导致ORR活性增强。使用LSCFT-0作为阳极支撑单电池的阴极材料，在< 800 °C的温度下获得了> 1.0 W·cm-2的功率密度。结果表明，CSSR衍生的LSCFT是一种有前途的SOFC阴极材料。
Lanthanum strontium cobalt ferrite (LSCF) is an appreciable cathode material for solid oxide fuel cells (SOFCs), and it has been widely investigated, owing to its excellent thermal and chemical stability. However, its poor oxygen reduction reaction (ORR) activity, particularly at a temperature of ⩽ 800 °C, causes setbacks in achieving a peak power density of > 1.0 W·cm−2, limiting its application in the commercialization of SOFCs. To improve the ORR of LSCF, doping strategies have been found useful. Herein, the porous tantalum-doped LSCF materials (La0.6Sr0.4Co0.4Fe0.57Ta0.03O3(LSCFT-0), La0.6Sr0.4Co0.4Fe0.54Ta0.06O3, and La0.6Sr0.4Co0.4Fe0.5Ta0.1O3) are prepared via camphor-assisted solid-state reaction (CSSR). The LSCFT-0 material exhibits promising ORR with area-specific resistance (ASR) of 1.260, 0.580, 0.260, 0.100, and 0.06 Ω·cm2at 600, 650, 700, 750, and 800 C, respectively. The performance is about 2 times higher than that of undoped La0.6Sr0.4Co0.4Fe0.6O3with the ASR of 2.515, 1.191, 0.596, 0.320, and 0.181 Ω·cm2from the lowest to the highest temperature. Through material characterization, it was found that the incorporated Ta occupied the B-site of the material, leading to the enhancement of the ORR activity. With the use of LSCFT-0 as the cathode material for anode-supported single-cell, the power density of > 1.0 W·cm−2was obtained at a temperature < 800 °C. The results indicate that the CSSR-derived LSCFT is a promising cathode material for SOFCs.