高性能LSFT-GDC复合电极的制备和性能研究

doi:10.16552/j.cnki.issn1001-1625.2025.0328

摘要/Abstract

摘要： 固体氧化物燃料电池(SOFCs)因具有高效、燃料选择广泛和低污染等特点,受到了广泛的关注。本文采用溶胶凝胶法制备了钙钛矿氧化物La_0.3Sr_0.7Fe_0.7Ti_0.3O₃(LSFT)和氧离子导体Gd_0.2Ce_0.8O_2-δ(GDC)复合电极材料,同时作为对称固体氧化物燃料电池(SSOFCs)的阴极和阳极。结果表明,不同LSFT与GDC质量比制备的复合电极化学相容性良好。在800 ℃时,使用LSFT-GDC复合电极(LSFT与GDC的质量比为6:4)的对称电池极化电阻约为0.28 Ω·cm²(湿氢气环境),最大功率密度为286 mW·cm^-2,电化学性能优异。这是因为LSFT复合氧离子导体GDC后,增大了电极材料三相反应界面,从而增加了电极对氧还原反应和氢气氧化的催化活性。另外,对称电池在24 h湿氢气环境测试中表现出优异的稳定性,未出现明显性能衰减,且经过5次氧化还原循环后仍能维持稳定的电化学性能。

关键词: 对称固体氧化物燃料电池, 复合电极, 氧化还原稳定性, 电化学性能测试, 弛豫时间, 稳定性

Abstract: Solid oxide fuel cells (SOFCs) have attracted extensive attention due to their exceptional efficiency, wide fuel selection, and low environmental pollution compared to conventional power generation systems. In this study, composite electrode materials comprising perovskite oxide La_0.3Sr_0.7Fe_0.7Ti_0.3O₃ (LSFT) and oxygen-ion conductor Gd_0.2Ce_0.8O_2-δ (GDC) were synthesized via the sol-gel method for application as both cathode and anode in symmetric solid oxide fuel cells (SSOFCs).The results show that the composite electrodes prepared with different mass ratios of LSFT and GDC exhibit good chemical compatibility. At 800 ℃, the symmetric cell using LSFT-GDC composite electrode (the mass ratio of LSFT and GDC is 6:4) achieves a polarization resistance of approximately 0.28 Ω·cm² (under humidified hydrogen atmosphere), with a maximum power density of 286 mW·cm^-2, demonstrating an excellent electrochemical performance. This enhanced performance is attributed to the LSFT composited with ionic conductor GDC, which extends the triple-phase reaction interface of the electrode material and improves catalytic activity for both oxygen reduction and hydrogen oxidation reactions. Furthermore, the symmetric cell demonstrates exceptional stability during a 24 h operational test in wet hydrogen atmosphere without performance degradation and maintained consistent electrochemical properties through 5 oxygen reduction cycles.

Key words: symmetric solid oxide fuel cell, composite electrode, oxygen reduction stability, electrochemical performance test, relaxation time, stability

中图分类号:

TM205.1

董浩, 曹志群, 李娜, 魏兆彤. 高性能LSFT-GDC复合电极的制备和性能研究[J]. 硅酸盐通报, 2025, 44(10): 3873-3879.

DONG Hao, CAO Zhiqun, LI Na, WEI Zhaotong. Preparation and Performance of High-Performance LSFT-GDC Composite Electrode[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3873-3879.

参考文献

[1] SINGLA M K, NIJHAWAN P, OBEROI A S. Hydrogen fuel and fuel cell technology for cleaner future: a review[J]. Environmental Science and Pollution Research International, 2021, 28(13): 15607-15626.
[2] SAJID A, PERVAIZ E, ALI H, et al. A perspective on development of fuel cell materials: electrodes and electrolyte[J]. International Journal of Energy Research, 2022, 46(6): 6953-6988.
[3] TIAN Y F, ABHISHEK N, YANG C C, et al. Progress and potential for symmetrical solid oxide electrolysis cells[J]. Matter, 2022, 5(2): 482-514.
[4] MINH N Q. Ceramic fuel cells[J]. Journal of the American Ceramic Society, 1993, 76(3): 563-588.
[5] LIU Y, LI H, CAI C, et al. Superior electrochemical performance of a Ce_0.8Gd_0.2O_2-δ/Zr_0.8Sc_0.2O_2-δ thin bilayer-protected gadolinium-doped ceria electrolyte in intermediate-temperature solid oxide fuel cells[J]. ACS Omega, 2023, 8(8): 8011-8018.
[6] ZHANG L L, YIN Y R, XU Y S, et al. Tailoring Sr₂Fe_1.5Mo_0.5O_6-δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells[J]. Science China Materials, 2022, 65(6): 1485-1494.
[7] HANIF M B, GAO J T, SHAHEEN K, et al. Performance evaluation of highly active and novel La_0.7Sr_0.3Ti_0.1Fe_0.6Ni_0.3O_3-δ material both as cathode and anode for intermediate-temperature symmetrical solid oxide fuel cell[J]. Journal of Power Sources, 2020, 472: 228498.
[8] ZHENG Y, ZHANG C M, RAN R, et al. A new symmetric solid-oxide fuel cell with La_0.8Sr_0.2Sc_0.2Mn_0.8O_3-δ perovskite oxide as both the anode and cathode[J]. Acta Materialia, 2009, 57(4): 1165-1175.
[9] ZHANG P, GUAN G Q, KHAERUDINI D S, et al. Properties of A-site nonstoichiometry (Pr_0.4)_xSr_0.6Co_0.2Fe_0.7Nb_0.1O_3-δ (0.9≤x≤1.1) as symmetrical electrode material for solid oxide fuel cells[J]. Journal of Power Sources, 2014, 248: 163-171.
[10] RUIZ-MORALES J C, CANALES-VÁZQUEZ J, PEÑA-MARTÍNEZ J, et al. On the simultaneous use of La_0.75Sr_0.25Cr_0.5Mn_0.5O_3-δ as both anode and cathode material with improved microstructure in solid oxide fuel cells[J]. Electrochimica Acta, 2006, 52(1): 278-284.
[11] 戴栋梁. 高性能的对称固体氧化物燃料电池电极材料的设计与开发[D]. 镇江: 江苏科技大学, 2022: 15-16
DAI D L. Design and development of high performance electrode materials for symmetric solid oxide fuel cells[D]. Zhenjiang: Jiangu University of Science and Technology, 2022: 15-16 (in Chinese).
[12] WEI T, ZHOU X, HU Q, et al. A high power density solid oxide fuel cell based on nano-structured La_0.8Sr_0.2Cr_0.5Fe_0.5O_3-δ anode[J]. Electrochimica Acta, 2014, 148: 33-38.
[13] CAO Z Q, ZHANG Y H, MIAO J P, et al. Titanium-substituted lanthanum strontium ferrite as a novel electrode material for symmetrical solid oxide fuel cell[J]. International Journal of Hydrogen Energy, 2015, 40(46): 16572-16577.
[14] WANG J J, LYU Q Q, ZHU T L, et al. Self-assembly and low-temperature sintered La_0.6Sr_0.4CoO_3-δ@Gd_0.1Ce_0.9O_2-δ composite cathode with rich electrode/electrolyte interface and enhanced performance in harsh condition[J]. International Journal of Hydrogen Energy, 2024, 58: 1114-1121.
[15] SHAHEEN K, SUO H L, SHAH Z, et al. Electrochemical performance of multifuel based nanocomposite for solid oxide fuel cell[J]. Ceramics International, 2020, 46(7): 8832-8838.
[16] GUO J P, ZHANG L, XIAN A, et al. Solderability of electrodeposited Fe-Ni alloys with eutectic SnAgCu solder[J]. Journal of Materials Science & Technology, 2007, 23(6): 811-816.
[17] LI N, HUANG G W, SHEN X J, et al. Controllable fabrication and magnetic-field assisted alignment of Fe₃O₄-coated Ag nanowires via a facile co-precipitation method[J]. Journal of Materials Chemistry C, 2013, 1(32): 4879-4884.
[18] GUPTA V K, MERGU N, KUMAWAT L K, et al. Selective naked-eye detection of magnesium (II) ions using a coumarin-derived fluorescent probe[J]. Sensors and Actuators B: Chemical, 2015, 207: 216-223.
[19] 徐娜, 孙梦真, 朱腾龙, 等. 一步法合成La_0.4Sr_0.6Co_0.2Fe_0.7Nb_0.1O_3-δ-Ce_0.8Gd_0.2O_2-δ对称电极应用于SOFC性能研究[J]. 稀有金属材料与工程, 2021, 50(3): 995-999.
XU N, SUN M Z, ZHU T L, et al. Co-synthesis of La_0.4Sr_0.6Co_0.2Fe_0.7Nb_0.1O_3-δ-Ce_0.8Gd_0.2O_2-δ symmetrical electrode for SOFC performance study[J]. Rare Metal Materials and Engineering, 2021, 50(3): 995-999 (in Chinese).
[20] DAI H L, HE S C, CHEN H, et al. Performance enhancement for solid oxide fuel cells using electrolyte surface modification[J]. Journal of Power Sources, 2015, 280: 406-409.
[21] CHEN K F, LÜ Z, CHEN X J, et al. Development of LSM-based cathodes for solid oxide fuel cells based on YSZ films[J]. Journal of Power Sources, 2007, 172(2): 742-748.
[22] WANG J K, FU L, YANG J M, et al. Cerium and ruthenium co-doped La_0.7Sr_0.3FeO_3-δ as a high-efficiency electrode for symmetrical solid oxide fuel cell[J]. Journal of Rare Earths, 2021, 39(9): 1095-1099.