B位高熵策略提高La0.7Sr0.3FeO3-δ基阴极性能

doi:10.15541/jim20240410

摘要/Abstract

摘要： 作为经典的固体氧化物燃料电池(SOFC)阴极材料,铁基钙钛矿材料具有成本低、热膨胀系数低和稳定性高的优点。本研究采用柠檬酸-硝酸盐燃烧法制备了B位高熵钙钛矿氧化物La_0.7Sr_0.3(FeNiCo)_0.8Mo_0.1Ti_0.1O_3-_δ(LSFNCMT)。由于高熵材料的氧表面交换速率更快,LSFNCMT阴极显示出优异的氧还原反应(ORR)活性,800 ℃的极化电阻(R_p)为0.11 Ω·cm²,远低于LSF阴极的0.31 Ω·cm²。更为重要的是,由于掺入高酸度的Ni,Co和Mo离子以及平均金属氧键能(ABE)更高的Ti离子,高熵材料表现出更出色的稳定性。以LSFNCMT为阴极的对称电池在含铬气氛的22 h稳定性测试中,R_p仅从1.07 Ω·cm²增加到2.98 Ω·cm²,而LSF对称电池的极化阻抗(R_p)从2.62 Ω·cm²增加到7.90 Ω·cm²。LSFNCMT阴极单电池在800 ℃下的最大功率密度(MPD)为1105.26 mW·cm^-2,显著高于LSF阴极单电池(830.74 mW·cm^-2),800 ℃下R_p为0.24 Ω·cm²,也低于相同条件下LSF阴极单电池(0.36 Ω·cm²),证实高熵阴极具有卓越的耐毒化性。结果表明,B位高熵是提高阴极材料催化活性和耐铬性的有效途径。

关键词: 固体氧化物燃料电池, 阴极材料, B位高熵, 抗铬中毒

Abstract: As classical cathode materials of solid oxide fuel cell (SOFC), Fe-based perovskite materials are favored for their affordable price, low thermal expansion coefficient and high stability. In this study, B-site high-entropy perovskite oxide La_0.7Sr_0.3(FeNiCo)_0.8Mo_0.1Ti_0.1O_3-_δ (LSFNCMT) was prepared by citric acid-nitrate combustion method. Due to the faster oxygen surface exchange rate of the high-entropy material, the LSFNCMT cathode shows excellent oxygen reduction reaction (ORR) activity with the polarization impedance (R_p) of 0.11 Ω·cm² at 800 ℃, much lower than the of the La_0.7Sr_0.3FeO_3-_δ (LSF) cathode (0.31 Ω·cm²). Furthermore, the high-entropy material exhibits superior stability due to the incorporation of highly acidic Ni, Co, and Mo cation as well as Ti cation with more negative average bonding energies of metal-oxygen (ABE). In the 22 h-stability test of the symmetric cell with LSFNCMT cathode in the Cr-containing atmosphere, R_p only increased from 1.07 Ω·cm² to 2.98 Ω·cm², while R_p of the LSF cathode increased from 2.62 Ω·cm² to 7.9 Ω·cm² under the same conditions, indicating better Cr-resistance of LSFNCMT due to the high-entropy strategy. The fact that the maximum power density (MPD) of the single cell with LSFNCMT cathode at 800 ℃ is 1105.26 mW·cm^-2, significantly higher than that of LSF cathode (830.74 mW·cm^-2), and R_p at 800 ℃ is 0.24 Ω·cm², lower than that of LSF cathode (0.36 Ω·cm²), confirm the excellent toxicity resistance of the high-entropy cathode. This study show that B-position high entropy is an effective way to improve the catalytic activity and chromium resistance of cathode materials.

Key words: solid oxide fuel cell, cathode material, B-site high entropy, anti-chromium poisoning

中图分类号:

刘弘明, 张金柯, 陈正鹏, 李明飞, 钱秀洋, 孙传骐, 熊凯, 饶睦敏, 陈创庭, 高源, 凌意瀚. B位高熵策略提高La_0.7Sr_0.3FeO_3-_δ基阴极性能[J]. 无机材料学报, DOI: 10.15541/jim20240410.

LIU Hongming, ZHANG Jinke, CHEN Zhengpeng, LI Mingfei, QIAN Xiuyang, SUN Chuanqi, XIONG Kai, RAO Mumin, CHEN Chuangting, GAO Yuan, LING Yihan. Enhanced Performance of La_0.7Sr_0.3FeO_3-_δ Cathode for SOFC via Implementation of B-site High-entropy Strategy[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20240410.

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