Open AccessElectrical and Electrochemical Performances Evaluation of LaNi0.6Fe0.4O3 Cathode Contact and Current Collecting Layer in SOFCs
Author(s) -
Yu Wang,
Qiuqiu Lyu,
Tenglong Zhu,
Yang Liu,
Kun Sun,
Zaihong Sun,
Yunfei Bu,
Qin Zhong,
Minfang Han
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac6834
Subject(s) - cathode , materials science , anode , electrochemistry , oxide , layer (electronics) , contact resistance , polarization (electrochemistry) , analytical chemistry (journal) , current collector , current density , chemical engineering , thermal stability , electrode , composite material , electrical engineering , metallurgy , chemistry , electrolyte , physics , chromatography , quantum mechanics , engineering
The electrical and electrochemical performances of LaNi0.6Fe0.4O3 (LNF) cathode contact and current collecting layer are investigated. The screen-printed LNF thin film (~17 μm) 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 a thick contact layer (~1 mm), an optimized method is developed in combination with alternate ink deposition and drying processes, to provide decent structural stability and interfacial contacts. The area specific resistance (ASR) of thick LNF contact layer shows high stability over 3000 hours operation under current load of 0.3 A/cm2. The ASR stabilizes at 0.086 Ω·cm2 for more than 1600 hours. 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.