High performance air electrode for solid oxide regenerative fuel cells fabricated by infiltration of nano-catalysts
- High performance air electrode for solid oxide regenerative fuel cells fabricated by infiltration of nano-catalysts
- 이성일; 김정희; 손지원; 이종호; 김병국; 제해준; 이해원; 송휴섭; 윤경중
- Nano-catalyst; Air electrode; Solid oxide fuel cell; Solid oxide electrolysis cell; Solid oxide regenerative fuel cell
- Issue Date
- Journal of power sources
- VOL 250, 15-20
- A high performance air electrode fabricated by infiltration of highly active nano-catalysts into a porous scaffold is demonstrated for high-temperature solid oxide regenerative fuel cells (SORFCs). The nitrate precursor solution for Sm0.5Sr0.5CoO3 (SSC) catalyst is impregnated into a porous La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)–gadolinia-doped ceria (GDC) composite backbone, and extremely fine SSC nano-particles are uniformly synthesized by in-situ crystallization at the initial stage of SORFC operation via homogeneous nucleation induced by urea decomposition. The SSC nano-catalysts are in the size range of 40–80 nm and stable against coarsening upon the SORFC operation at 750 °C. The electrochemical performance is significantly improved by incorporation of SSC nano-catalysts in both power generation and hydrogen production modes. Systematic analysis on the impedance spectra reveals that the surface modification of the air electrode with nano-catalysts remarkably accelerates the chemical surface exchange reactions for both O2 reduction and O2− oxidation, which are the major limiting processes for SORFC performance.
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