固体氧化物燃料电池La0.7Sr0.3Fe0.9Ni0.1O3-δ 对称电极的电化学性能

doi:10.19799/j.cnki.2095-4239.2021.0628

储能科学与技术 ›› 2022, Vol. 11 ›› Issue (7): 2059-2065.doi: 10.19799/j.cnki.2095-4239.2021.0628

固体氧化物燃料电池La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ 对称电极的电化学性能

刘长洋¹^,²(), 卞刘振¹^,²(), 郜建全¹^,², 彭继华¹^,², 彭军¹^,², 安胜利¹^,²()

^1.内蒙古科技大学材料与冶金学院
^2.内蒙古先进陶瓷材料与器件重点实验室，内蒙古包头 014010

收稿日期:2021-11-25 修回日期:2022-01-13 出版日期:2022-07-05 发布日期:2022-06-29
通讯作者: 卞刘振,安胜利 E-mail:lcy520life@126.com;liuzhenbian@126.com;shengli_an@126.com
作者简介:刘长洋（1996—），男，硕士研究生，E-mail：lcy520life@126.com；
基金资助:
国家自然科学基金(51974167);内蒙古自治区博士基金(2020BS05032);内蒙古科技大学创新基金(2019QDL-B01);内蒙古自治区科技攻关计划(2020GG0155)

Electrochemical performance of La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ symmetric electrode for solid oxide fuel cell with CO as fuel

Changyang LIU¹^,²(), Liuzhen BIAN¹^,²(), Jianquan GAO¹^,², Jihua PENG¹^,², Jun PENG¹^,², Shengli AN¹^,²()

^1.College of Materials and Metallurgy, Inner Mongolia University of Science and Technology
^2.Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Instruments, Baotou 014010, Inner Mongolia, China

Received:2021-11-25 Revised:2022-01-13 Online:2022-07-05 Published:2022-06-29
Contact: Liuzhen BIAN, Shengli AN E-mail:lcy520life@126.com;liuzhenbian@126.com;shengli_an@126.com

摘要/Abstract

摘要：

采用溶胶凝胶法合成了Sr、Ni共掺杂的La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ (LSFNi)电极材料，研究了CO在LSFNi电极上的电化学氧化过程。研究结果表明：LSFNi与La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-_δ (LSGM)电解质和Gd_0.2Ce_0.8O_2-_δ (GDC)之间具有良好的化学兼容性，同时LSFNi材料在5%H₂-Ar下的电导率随着温度的升高而增加，850 ℃时电导率达到0.85 S /cm。当以CO为燃料时，LSFNi-GDC/LSGM/LSFNi-GDC对称全电池在850、800、750和700 ℃下的最大功率密度分别达到470、288、196和130 mW/cm²。对称全电池在CO下的极化电阻分别为0.64、1.01、1.83和3.82 ?·cm²。与H₂燃料相比，CO电化学氧化的电荷转移过程和吸脱附过程较为困难，导致以CO为燃料的电池性能略低于以H₂为燃料时的性能。此外，对称电池在850 ℃和600 mA/cm²的放电电流下电池的电压从0.719 V衰减到0.657 V，电池的衰减速率约为0.003 V/h。

关键词: 固体氧化物燃料电池, 对称电极, 积碳, CO

Abstract:

Sr、Ni co-doped La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ (LSFNi) electrode was synthesized using a sol-gel method. The oxidation of CO electrochemically on LSFNi was studied. The results demonstrate that the LSFNi electrode has good chemical compatibility with LSGM and GDC electrolytes. Furthermore, the conductivity of the LSFNi bar increases with the increasing temperature in the 5% H₂-Ar, and the maximum conductivity of 0.85 S·cm^-1 was obtained at 850 ℃. The peak power density of LSFNi-GDC/LSGM/LSFNi-GDC symmetric cell reaches 470, 288, 196, and 130 mW·cm^-2 at 850 ℃, 800 ℃, 750 ℃, and 700 ℃, respectively. Furthermore, the polarization resistance (R_p ) of the symmetric full cell at the same condition is 0.64, 1.01, 1.83, and 3.82 ?·cm², respectively. The charge transfer mechanism and adsorption/desorption of CO are slower than those of H₂, resulting in a somewhat poorer electrochemical property. In the end, the symmetric cell exhibits a reasonable short stability with a degradation rate of 0.003 V·h^-1 at 850℃ under a constant current density of 600 mA·cm^-2.

Key words: solid oxide fuel cell, symmetric cell, carbon deposition, CO

中图分类号:

O 646

刘长洋, 卞刘振, 郜建全, 彭继华, 彭军, 安胜利. 固体氧化物燃料电池La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ 对称电极的电化学性能[J]. 储能科学与技术, 2022, 11(7): 2059-2065.

Changyang LIU, Liuzhen BIAN, Jianquan GAO, Jihua PENG, Jun PENG, Shengli AN. Electrochemical performance of La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ symmetric electrode for solid oxide fuel cell with CO as fuel[J]. Energy Storage Science and Technology, 2022, 11(7): 2059-2065.

图/表 8

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参考文献 30

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t/℃	Atmosphere	R_s/Ω·cm²	R₁/Ω·cm²	C₁(*10^-4)/F·cm²	f₁/Hz	R₂/Ω·cm²	C₂/F·cm²	f₂/Hz	R_p/Ω·cm²
850	H₂	0.24	0.32	11.4	444	0.15	1.87	0.56	0.47
850	CO	0.23	0.35	10.2	446	0.29	1.76	0.31	0.64
800	H₂	0.31	0.57	7.6	371	0.12	1.86	0.69	0.69
800	CO	0.31	0.77	9.2	222	0.24	2.08	0.32	1.01
750	H₂	0.43	0.95	7.0	241	0.23	0.42	1.63	1.18
750	CO	0.43	1.35	9.2	128	0.48	1.78	0.19	1.83
700	H₂	0.66	2.05	7.6	102	0.31	0.30	1.71	2.36
700	CO	0.46	2.69	11.3	52	1.13	1.57	0.15	3.82

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固体氧化物燃料电池La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ 对称电极的电化学性能

Electrochemical performance of La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ symmetric electrode for solid oxide fuel cell with CO as fuel

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