LaNi0.6Fe0.4O3阴极接触材料导电特性调控及其对SOFC电化学性能的影响

doi:10.15541/jim20230353

无机材料学报 ›› 2024, Vol. 39 ›› Issue (4): 367-373.DOI: 10.15541/jim20230353

LaNi_0.6Fe_0.4O₃阴极接触材料导电特性调控及其对SOFC电化学性能的影响

张琨¹(), 王宇¹, 朱腾龙¹(), 孙凯华², 韩敏芳³, 钟秦¹

1.南京理工大学化学与化工学院, 南京 210094
2.徐州华清京昆能源有限公司, 徐州 221005
3.清华大学能源与动力工程系, 北京 100084

收稿日期:2023-08-03 修回日期:2023-09-04 出版日期:2024-04-20 网络出版日期:2023-09-12
通讯作者: 朱腾龙, 副教授. E-mail: zhutenglong@njust.edu.cn
作者简介:张琨(1999-), 男, 硕士研究生. E-mail: 2498249631@qq.com
基金资助:
国家重点研发计划项目(2018YFB1502203);江苏省碳达峰碳中和科技创新专项(BE2022029)

LaNi_0.6Fe_0.4O₃ Cathode Contact Material: Electrical Conducting Property Manipulation and Its Effect on SOFC Electrochemical Performance

ZHANG Kun¹(), WANG Yu¹, ZHU Tenglong¹(), SUN Kaihua², HAN Minfang³, ZHONG Qin¹

1. School of Chemistry and Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
2. Xuzhou Huatsing Jingkun Energy Co., Ltd., Xuzhou 221005, China
3. Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China

Received:2023-08-03 Revised:2023-09-04 Published:2024-04-20 Online:2023-09-12
Contact: ZHU Tenglong, associate professor. E-mail: zhutenglong@njust.edu.cn
About author:ZHANG Kun (1999-), male, Master candidate. E-mail: 2498249631@qq.com
Supported by:
National Key R&D Program of China(2018YFB1502203);Key R&D Program of Jiangsu Province(BE2022029)

摘要/Abstract

摘要：

鉴于平板式固体氧化物燃料电池(SOFC)电堆对低面电阻、高稳定性阴极接触材料的需求, 本研究阐明了LaNi_0.6Fe_0.4O₃(LNF)颗粒尺寸调控对导电和SOFC单电池性能演变的影响机制, 优化了LNF预处理工艺, 降低了接触组件面电阻，提升了SOFC单电池性能及热循环稳定性。结果表明：预压造粒的样品(LNF-2)与高温烧结预处理的样品(LNF-3)的面电阻更小, 分别为0.074和0.076 Ω·cm²; 在750 ℃施加1 A/cm²电流负载后, 能够更快地进入稳态, 并保持颗粒尺寸稳定。其中, LNF-2单电池在750 ℃下的峰值功率密度0.94 W/cm²较未处理的LNF的 0.66 W/cm²高, 但在热循环过程中性能衰减较大,下降了20%; 而LNF-3单电池在20次热循环后峰值功率密度仅下降了4%。本研究对高可靠SOFC电堆装配及其长寿命稳定运行具有指导及参考价值。

关键词: 固体氧化物燃料电池(SOFC), 阴极接触材料, LaNi_0.6Fe_0.4O₃, 热循环

Abstract:

In order to fulfil the requirement of low area specific resistance and highly stable cathode contact material in planar type solid oxide fuel cell (SOFC) stack assembling, this work investigated the electrical property evolution of LaNi_0.6Fe_0.4O₃ (LNF) with manipulated particle size and its effect on SOFC electrochemical performance. The optimized pre-treatment strategies of LNF were obtained with decreasing ASR, improving SOFC single cell performance and thermal cycling stability. Results show that, the dry-pressed LNF-2 and the high-temperature sintering-pre-treated LNF-3 possess smaller area specific resistances of 0.074 and 0.076 Ω·cm², respectively, more stable particle sizes with shorter conditioning state and faster transfer into steady state after applying 1 A/cm² current load at 750 ℃. Specifically, the single cell with LNF-2 shows improved peak power density of 0.94 W/cm² compared to 0.66 W/cm² of LNF without treatment at 750 ℃. However, it exhibits significant performance degradation during thermal cycling, decreasing by 20%. In contrast, the peak power density of LNF-3 single cell decreases by only 4% after 20 thermal cycles. This work is expected to provide guideline and valued reference for reliable SOFC stack assembling and stable operation.

Key words: solid oxide fuel cell (SOFC), cathode contact material, LaNi_0.6Fe_0.4O₃, thermal cycling

中图分类号:

TQ174

张琨, 王宇, 朱腾龙, 孙凯华, 韩敏芳, 钟秦. LaNi_0.6Fe_0.4O₃阴极接触材料导电特性调控及其对SOFC电化学性能的影响[J]. 无机材料学报, 2024, 39(4): 367-373.

ZHANG Kun, WANG Yu, ZHU Tenglong, SUN Kaihua, HAN Minfang, ZHONG Qin. LaNi_0.6Fe_0.4O₃ Cathode Contact Material: Electrical Conducting Property Manipulation and Its Effect on SOFC Electrochemical Performance[J]. Journal of Inorganic Materials, 2024, 39(4): 367-373.

图/表 8

图1 SOFC电堆中阴极与连接体接触界面示意图

Fig. 1 Schematic diagram of the cathode and interconnector contact interface

图2 在750 ℃和1 A/cm2工况下LNF的ASR随时间的变化规律

Fig. 2 ASR evolution of LNF versus time under the conditions of 750 ℃ and 1 A/cm2

图3 ASR测试前后LNF的SEM照片

Fig. 3 SEM images of LNF before and after ASR test (a) Initial; (b) Post-test

图4 单电池在750 ℃和不同氧气分压下的(a)EIS阻抗谱图和(b)DRT拟合图

Fig. 4 (a) EIS spectra and (b) DRT fitting plots for single cells tested at 750 ℃ and varied oxygen partial pressures Colorful images are available on website

图5 单电池在2.1×104及3×103 Pa阴极氧分压下的(a)EIS阻抗谱图和(b)DRT拟合图; 拟合得到的(c)欧姆阻抗及(d)极化阻抗对比

Fig. 5 (a) EIS spectra and (b) DRT fitting plots of single cells under oxygen partial pressure of 2.1×104 and 3×103 Pa, and comparison of corresponding (c) Ohmic resistance and (d) polarization resistance Colorful images are available on website

图6 单电池在750 ℃和不同阴极侧氧分压下的(a~c)j-V-P曲线及(d)峰值功率密度对比

Fig. 6 (a-c) j-V-P curves and (d) peak power density comparison of single cells versus different oxygen partial pressure on cathode sides at 750 ℃ Colorful images are available on website

图7 单电池在热循环过程中的电化学性能演变

Fig. 7 Evolution of electrochemical performances for single cells under thermal cycling (a) RΩ; (b) Rp; (c) Peak power density Colorful images are available on website

图8 热循环前后单电池阴极接触界面变化示意图及微观形貌

Fig. 8 Schematic diagrams and SEM images for cathode contact interfaces of single cells before and after thermal cycling (a) LNF-2; (b) LNF-3

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LaNi_0.6Fe_0.4O₃阴极接触材料导电特性调控及其对SOFC电化学性能的影响

LaNi_0.6Fe_0.4O₃ Cathode Contact Material: Electrical Conducting Property Manipulation and Its Effect on SOFC Electrochemical Performance

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