Sputtered MnCu metallic coating on ferritic stainless steel for solid oxide fuel cell interconnects application. (13th April 2017)

• Record Type: Journal Article
• Authors: Geng, Shujiang; Zhao, Qingqing; Li, Yaohua; Mu, Jianjia; Chen, Gang; Wang, Fuhui; Zhu, Shenglong
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 15(2017)
• Page Start: 10298
• Page End: 10307
• Publication Date: 2017-04-13
• Subjects: Solid oxide fuel cell -- Steel interconnects -- Sputtered MnCu metallic coating -- Thermal exposure -- Area specific resistance; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.01.178
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: MnCu (Mn:Cu = 1:1, atomic ratio) metallic coatings have been deposited by magnetron sputtering on bare and on 100 h pre-oxidized SUS 430 steel for planar solid oxide fuel cells interconnects application. After oxidation at 800 °C in air, the MnCu coating directly deposited on the bare steel has been thermally converted to (Mn, Cu)3 O4 spinel with Fe, containing discrete CuO on the outer surface. Nevertheless, the converted (Mn, Cu)3 O4 /CuO layer from the MnCu coating deposited on the pre-oxidized steelis almost free of Fe. A double-layer oxide structure with a main (Mn, Cu)3 O4 spinel layer atop a Cr-rich oxide layer has been developed on the bare and pre-oxidized steel samples with MnCu coatings after thermal exposure. The outer layer mainly consisted of (Mn, Cu)3 O4 spinel has not only significantly suppressed Cr outward migration to the scale surface, but also effectively reduced the area specific resistance (ASR) of the scale. The sputtered MnCu metallic coating is a very promising candidate for steel interconnect coating material. Highlights: MnCu coating has been sputtered on bare and on pre-oxidized SUS 430 steel. (Mn, Cu)3 O4 spinel atop Cr-rich oxide has been thermally grown on the coated steels. Cr2 O3 formed on the pre-oxidized steel has suppressed outward diffusion of Fe. (Mn, Cu)3 O4 outer layer has effectively inhibited Cr outward migration. The double-layer surface scale has exhibited a high electrical conductivity.