LaNi0.6Fe0.4O3 Cathode Contact Material: Electrical Conducting Property Manipulation and Its Effect on SOFC Electrochemical Performance

doi:10.15541/jim20230353

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 8

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

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

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

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

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

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

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

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

References 30

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

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