Solid Oxide Cells for Power-to-X: Application & Challenges. (10th July 2019)

• Record Type: Journal Article
• Authors: Costa, Rémi; Amaya Dueñas, Diana María; Futter, Georg; Jahnke, Thomas; Riegraf, Matthias; Schiller, Guenter; Surrey, Alexander
• Is Part Of: ECS transactions. Volume 91:Number 1(2019)
• Page Start: 2527
• Page End: 2536
• Publication Date: 2019-07-10
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/09101.2527ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : Solid oxide electrolysis presents the unique feature to allow simultaneous reduction of steam and CO2 into a highly valuable CO+H2 syngas mixture. Both mainstream solid oxide cell architectures, namely anode supported cells (ASCs) and electrolyte supported cells were investigated in co-electrolysis operation. It is found that, ASCs suffer from microstructural instability of the fuel electrode characterized by a migration of nickel away from the interface with the electrolyte as in steam electrolysis. This holds especially true when operated at high temperature, large steam content and large overpotential. Microstructural optimization may be required to enhance durability. Moreover, the thermodynamic of CO2 reduction that differs from the one of steam, is found to induce stronger thermal effects, when operated in dynamic operation. This requires the development of an operational strategy to minimize potential temperature gradient within the stack when dynamic operation is considered.