Performance analysis of SOFC with electrode-electrolyte interface tailored by laser micro-machining

Trabajo presentado al Solid Oxide Fuel Cells 16 (SOFC-XVI), celebrado en Kyoto (Japón) del 8 al 13 de septiembre de 2019.The interfacial area between the electrode and the electrolyte of solid oxide fuel cells (SOFCs) is increased by a pulsed-laser machining to expand the active electrochemical reaction region. The pulsed-laser machining is performed on the surface of the YSZ flat electrolytes to fabricate micro-patterned craters. The surface profiles of the patterned electrolytes are measured by a 3D laser profiler. Then, LSM cathode is fabricated on the laser-machined surface of the YSZ electrolyte, while Ni-YSZ anode on the flat side. The performance of the fabricated cell with the patterned interface is experimentally evaluated at 900°C and compared with that of the conventional cell having the flat interface. 3D numerical simulations are also performed on the patterned cell to understand the distributions of the activation overpotentials and the charge-transfer current at the interface. A power density enhancement is confirmed in the cell with the patterned interface in both experiment and simulation.This work was partially supported by JST under Collaborative Research Based on Adaptable and Seamless Technology Transfer Program through Target-driven R&D (ASTEP) (No.JPMJTS1613) and by JSPS bilateral open partnership joint research project with Spain, “Optimization of Electrode-Electrolyte Interface of Solid Oxide Fuel Cell by Pulse Laser Ablation and Thin Film Deposition”. The characterization of the lasermachined surface was conducted at the Kyoto University Nanotechnology Hub.Peer reviewe