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LaNi0.6Fe0.4O3 Cathode Contact Material: Electrical Conducting Property Manipulation and Its Effect on SOFC Electrochemical Performance
Kun ZHANG, Yu WANG, Tenglong ZHU, Kaihua SUN, Minfang HAN, Qin ZHONG
J Inorg Mat ›› 2024, Vol. 39 ›› Issue (4) : 367-373.
PDF(2984 KB)
PDF(2984 KB)
LaNi0.6Fe0.4O3 Cathode Contact Material: Electrical Conducting Property Manipulation and Its Effect on SOFC Electrochemical Performance
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 LaNi0.6Fe0.4O3 (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.
solid oxide fuel cell (SOFC) / cathode contact material / LaNi0.6Fe0.4O3 / thermal cycling
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In this work, the electrical and electrochemical performances of LaNi0.6Fe0.4O3 (LNF) cathode contact and current collecting layer are investigated. The screen-printed LNF thin film on LSCF-GDC cathode effectively improves the performance of anode supported single cell with maximum power density increase by ∼15% and polarization resistance decrement by ∼24%. However, the LNF layer is found to hinder oxygen diffusion under low cathode oxygen partial pressure below ∼0.07 atm. For the application as thick contact layer, an optimized method is developed in combination with alternate ink deposition and drying processes, to provide decent structural stability and interfacial contact. The area specific resistance (ASR) of thick LNF contact layer shows high long-term stability under current load of 300 mA cm−2. The ASR stabilizes at 0.086 Ω·cm2 for more than 1600 h. Moreover, the LNF contact layer operates stably after 7 thermal cycles. The results indicate that, LNF is promisingly applicable as current contact and collecting material in solid oxide fuel cells.
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In this work, LaNi0.6Fe0.4O3 is prepared and applied as cathode current contact layer on anode supported SOFC. The conducting property of both thin (~7μm) and thick LNF film (~1mm) are tested using lateral Van der Pauw DC conductivity test method and direct DC conductivity test method. Results show that the LNF layer prominently improves electrochemical performance of industrial sized anode supported single cell by ~29% at voltage of 0.7V at 800 and 750℃. During long-term annealing, 950℃ pre-fired LNF film performs more stable conducting property than 900℃ prepared sample. While the area specific resistance of LNF thick film shows a small increasing by ~0.272% per 1000 hours at 750℃, under constant current load. Suggesting good application prospects in planar solid oxide fuel cell stack.
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