Review: Influence of alloy addition and spinel coatings on Cr-based metallic interconnects of solid oxide fuel cells. (21st September 2020)

• Record Type: Journal Article
• Authors: Hassan, Muhammad Aqib; Mamat, Othman Bin; Mehdi, Muhammad
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 46(2020)
• Page Start: 25191
• Page End: 25209
• Publication Date: 2020-09-21
• Subjects: Solid oxide fuel cell -- Cr-based metallic interconnects -- Cr-migration -- Spinel coatings -- Crofer 22 APU -- SUS 430; ASR Area specific resistance -- CTE Co-efficient of thermal expansion -- EDS Energy Dispersive X-Ray Spectroscopy -- GDC Gallium Doped Ceria -- LSM Lanthanum strontium manganite -- MW Mega watts -- SOFC Solid Oxide fuel Cell -- ScSZ Scandia Stabilized Zirconia -- YSZ Yttria-Stabilized Zirconia -- Scm−1 Siemens per centimeter -- Wm−1 K−1 Watts per meter-kelvin -- Ω.cm2 ohms-centimeter square; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.06.234
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Solid oxide fuel cell (SOFC) is the modern eco-friendly technology of fuel cell power generation system. It generates electricity from a redox chemical reaction without producing hazardous gases. It consists of anode, cathode and electrolyte. It is operated in the form of stack connected by interconnects to boost-up power output. The recent development of low-temperature (600 °C–800 °C) brings an opportunity to use metallic interconnects over ceramics. Cr-based metallic interconnects are one of the prominent metallic interconnects. They offer chemical inertness, thermal stability, compatible coefficient of thermal expansion and highly dense structure. However, the Cr-migration towards the cathode side is the major problem in them which adversely affect the SOFCs performance. Therefore a good oxidation resistance without sacrificing electrical conductivity is required. To resolve this issue, several alloying elements and spinel coatings have experimented. These spinel coatings are the thin solid films of Mn, Co, Cu and rare earth metals. This review concluded that the Mn–Co based spinal coating showed excellent performance in reducing the Cr-migration in specially designed expensive Crofer 22 APU interconnect. However, the emerging low-cost ferritic interconnects also show their best results with Cu–Fe based spinel coating. Among them, the SUS-430 interconnect shows the equivalent performance of Crofer 22 APU interconnect after surface treatment and appropriate Cu–Fe based spinel coating. Therefore, it can replace the Crofer 22 APU interconnect on a cost basis. Highlights: This review discuss the various alloy addition and spinel coating for Cr-based metallic interconnects. The Mn–Co based spinel coating is the most promising for Crofer 22 APU. Cu–Fe based spinel coating is the best for low-cost ferritic interconnects. Low-cost ferritic interconnect can replace Crofer on a cost basis after appropriate coating of Cu-Fe based spinel coating.