化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (4) : 135-139.

科学研究

Ruddlesden-Popper结构La₂NiO_4+δ作为SOEC/SOFC氧电极的性能研究

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Property of Ruddlesden-Popper structure La₂NiO_4+δ as SOEC/SOFC oxygen electrode

Tong Xin^1,2, Che Wei^1,2, Zhou Feng^1,2, Yang Shengbin^1,2

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Received		Published
2017-01-05		2018-04-20
Issue Date	Revised Date
2018-05-17	2017-01-05

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摘要

采用溶胶-凝胶法合成La₂NiO_4+δ粉末,并对粉末的非化学计量氧系数、电导率、氧表面交换性能、电化学性能以及稳定性进行分析。结果表明,制备的La₂NiO_4+δ粉末均形成了单相Ruddlesden-Popper结构并且非化学计量氧系数高达0.16。600～750℃区间内La₂NiO_4+δ的电导率达到了90S/cm左右,略低于氧电极材料对电导率的要求—100S/cm以上。同时,相较于传统的氧电极材料-La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ(LSCF),La₂NiO_4+δ表现出更好的催化活性,这主要归因于更好的氧表面交换性能。此外,La₂NiO_4+δ既可以在SOFC模式下工作,也可以在SOEC模式下工作。当工作在SOFC模式下时,48h内电极性能保持稳定;但工作在SOEC模式下时,电极性能在初始阶段发生剧烈衰减,随后才保持稳定。

Abstract

La₂NiO_4+δ powder was synthesized by sol-gel method.Non stoichiometric oxygen coefficient δ,electronic conductivity,oxygen surface exchange performance,electrochemical performance and stability were investigated.Results showed that the powder was with single phase Ruddlesden-Popper structure and δ=0.16.At the range of 600～750℃,the electronic conductivity of La₂NiO_4+δ was about 90S/cm,slightly lower than oxygen electrode material requirements for electrical conductivity-more than 100S/cm.Meanwhile,compared with conventional oxygen electrode material LSCF,La₂NiO_4+δ showed better catalytic for redox reaction,which was attributed to better oxygen surface exchange performance.In addition,the material can both work in SOEC and SOFC mode.Working in SOFC mode,the performance of La₂NiO_4+δ electrodes remained stable in 48h.However,working in SOEC mode,the electrodes performance decayed dramatically in the initial stage.

关键词

La₂NiO_4+δ氧电极 / SOEC/SOFC / 电化学 / 氧表面交换 / 极化

Key words

La₂NiO_4+δ oxygen electrode / SOEC/SOFC / electrochemistry / oxygen surface exchange / polarization

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Ruddlesden-Popper结构La₂NiO_4+δ作为SOEC/SOFC氧电极的性能研究[J]. 化工新型材料, 2018, 46(4): 135-139 DOI:

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