Efficient and stable symmetrical solid oxide fuel cell via A-site non-stoichiometry

材料科学 阳极 阴极 极化(电化学) 还原气氛 化学工程 氧化剂 氧化物 氧化还原 电极 标准氢电极 固体氧化物燃料电池 氢燃料 电化学 燃料电池 化学 参比电极 冶金 有机化学 物理化学 工程类
作者
Xinghong Zhou,Mingze Li,Weimin Yang,Haibo Hu,Jun Li,Yi Lu,Xiaoyu Wang,Xifeng Ding
出处
期刊:Electrochimica Acta [Elsevier BV]
卷期号:425: 140697-140697 被引量:8
标识
DOI:10.1016/j.electacta.2022.140697
摘要

Symmetrical solid oxide fuel cells (SSOFCs) with identical anode and cathode have many benefits compared with traditional SOFCs. However, it is still a challenge to find high performance electrode materials with excellent catalytic activity and preferable stability under both reducing and oxidizing atmosphere. Here, a novel Ba0.9La0.1Co0.7Fe0.2Nb0.1O3-δ (BLCFN) perovskite electrode has been developed as promising symmetrical electrode material for SSOFCs. The A-site non-stoichiometry introduced in BLCFN simultaneously enhances both the cathode and anode electrocatalytic performance. The cathode polarization resistance of BLCFN with 5% deficiency is decreased by 28.6% to 0.05 Ω·cm2 at 750°C in air, which can be mainly attributed to the increase of oxygen vacancy concentration via partial ionic defect. The BLCFN anode polarization resistance is reduced by 42.1% to 0.11 Ω·cm2 at 750°C in 5% H2/N2. The promoted hydrogen oxidation reaction activity of BLCFN is related to the exsolved homogeneous Co-Fe nanoparticles from BL95CFN substrate in reducing atmosphere. The full cell with BL95CFN symmetrical electrodes displays high redox stability through reversing the flow of wet hydrogen and ambient air. Additionally, this SSOFCs with strong anchor characteristic of exsolved Co-Fe nanoparticles shows excellent coking-tolerance using methane fuel compared with traditional Ni-SDC anode. This work provides a potential way towards the development of high-performance, excellent redox-stable and coking-tolerant SSOFCs.
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