AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
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Fabrication of High-performance Multiscale Composite Cathode of Solid Oxide Fuel Cell (SOFC) via Aerosol-based Spray Deposition Methods
SUNG SOO SHIN, Jeong Hun Kim, Ho Sung Noh, Guangmin Lee, Ji-Won Son, Hyoungchul Kim, Mansoo Choi, Seoul National University
Abstract Number: 331 Working Group: Nanoparticles and Materials Synthesis
Abstract In the solid oxide fuel cell (SOFC), oxygen ion transfer rate at the boundary of electrolyte and electrode is one of the most important factors at the reaction of oxygen exchange. In this study, to enhance the oxygen ion transfer ability, we fabricated multiscale composite structure cathode of SOFC via aerosol-based spray deposition methods. Aerosol process has advantages of thin film fabrication and morphology control. And also, it is easy to fabricate porous multi-layer structure cathode with simple process. First, thin (under 1 micro-meter) and uniform Lanthanum strontium cobaltite (LSC) layer with under 100 nm size nanoparticles was fabricated by electrospray deposition of LSC sol. For investigation of the morphology change of the sol, we examine the effect of variables such as applied voltage, nozzle tip-to-substrate distance, flow rate of the solution and diameter of the nozzle tip. Then, thick (~ 10 micro-meter) and uniform cathode layer was fabricated by polymer-assisted nanospray deposition (PA-NSD) method using the mixture consists of LSC powder (particle size of 400 ~ 500 nm), ethyl alcohol and polyvinylpyrrolidone (PVP) dispersant. To increase the overall thickness of cathode and fabricate the porous cathode structure, particle size of the LSC powder and the weight ratio of the PVP and LSC were concerned. As a result, electrochemical performance of the full cell with the multiscale composite structure cathode is much increased than the same full cell without the electrosprayed LSC sol layer because of the ability enhancement of oxygen ion transfer by LSC nanoparticles at the boundary of the electrolyte and electrode.