Rapid Laser Processing of Thin Sr‐Doped LaCrO3–δ Interconnects for Solid Oxide Fuel Cells. Issue 10 (31st August 2020)

• Record Type: Journal Article
• Authors: Ishii, Akihiro; Mu, Shenglong; Meng, Yuqing; Huang, Hua; Lei, Jincheng; Li, Yanjun; Peng, Fei; Xiao, Hai; Tong, Jianhua; Brinkman, Kyle S.
• Is Part Of: Energy technology. Volume 8:Issue 10(2020:Oct.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-31
• Subjects: interconnects -- LaCrO3 -- laser sintering -- solid oxide electrolysis cells -- solid oxide fuel cells; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.202000364
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : Rapid laser reactive sintering (RLRS) is an additive manufacturing process which enables the quick and efficient fabrication of a wide range of ceramic‐based cells with various geometries and microstructures. Herein, the preparation of La0.8 Sr0.2 CrO3– δ interconnects by RLRS for solid‐oxide fuel/electrolysis cells (SOFC/ECs) is demonstrated. Uniform perovskite structure without residual intermediate phases can be achieved by CO2 laser irradiation at 103 W with a scanning speed of 0.07–0.10 mm s −1 . Narrowing the width of the underlying MgO substrate and deposition of a terpineol‐based slurry with a solid loading level of less than 4 g m −2 are found to be critical parameters to avoid cracking and delamination. The optimum laser conditions balance Cr loss and densification of La0.8 Sr0.2 CrO3– δ resulting in an 11‐μm‐thick RLRS‐derived La0.8 Sr0.2 CrO3– δ film having a high relative density of 80–95% with a low area specific resistance (ASR) of 0.003 Ω cm 2 at 600 °C. This ASR is more than 30 times lower than that of furnace‐sintered La0.8 Sr0.2 CrO3– δ in the same thickness range. The RLRS technique is promising for quick and efficient preparation of dense and thin La0.8 Sr0.2 CrO3– δ which are key components for highly compact SOFC/ECs. Abstract : Poor sinterability of Sr‐doped LaCrO3 obstructs electrically stacked ceramic fuel cells as long‐time sintering leads to Cr loss, resulting in increased resistibility especially in film form. However, laser sintering can suppress the resistibility increment as it is rapid, resulting in 30 times lower resistibility than using furnaces.