Surface-Modified Low-Temperature Solid Oxide Fuel Cell
- Title
- Surface-Modified Low-Temperature Solid Oxide Fuel Cell
- Author
- 김영범
- Keywords
- low-temperature solid oxide fuel cell; oxide ion conducting ceramic electrolyte; quantum simulation; cathode interlayer; yttria-doped ceria; INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; AB-INITIO; HIGH-PERFORMANCE; ELECTROLYTES; ZIRCONIA; CERIA; SOFC; ELECTRODES
- Issue Date
- 2011-08
- Publisher
- WILEY-BLACKWELL, COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
- Citation
- ADVANCED FUNCTIONAL MATERIALS; DEC 20 2011, 21 24, p4684-p4690
- Abstract
- This paper reports both experimental and theoretical results of the role of surface modification on the oxygen reduction reaction in low-temperature solid oxide fuel cells (LT-SOFC). Epitaxial ultrathin films of yttria-doped ceria (YDC) cathode interlayers (<10130 nm) are grown by pulsed laser deposition (PLD) on single-crystalline YSZ(100). Fuel cell currentvoltage measurements and electrochemical impedance spectroscopy are performed in the temperature range of 350 degrees C 450 degrees C. Quantum mechanical simulations of oxygen incorporation energetics support the experimental results and indicate a low activation energy of only 0.07 eV for YDC, while the incorporation reaction on YSZ is activated by a significantly higher energy barrier of 0.38 eV. Due to enhanced oxygen incorporation at the modified Pt/YDC interface, the cathodic interface resistance is reduced by two-fold, while fuel cell performance shows more than a two-fold enhancement with the addition of an ultrathin YDC interlayer at the cathode side of an SOFC element. The results of this study open up opportunities for improving cell performance, particularly of LT-SOFCs by adopting surface modification of YSZ surface with catalytically superior, ultrathin cathodic interlayers.
- URI
- http://onlinelibrary.wiley.com/doi/10.1002/adfm.201101058/abstract
- ISSN
- 1616-301X
- DOI
- 10.1002/adfm.201101058
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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