Morphologically well-defined Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-delta nanofiber with an enhanced triple phase boundary as cathode for low-temperature solid oxide fuel cells
- Title
- Morphologically well-defined Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-delta nanofiber with an enhanced triple phase boundary as cathode for low-temperature solid oxide fuel cells
- Author
- 백운규
- Keywords
- Solid oxide fuel cell; Electrospinning; Cathode; Nanofiber; BSCF
- Issue Date
- 2018-02
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- JOURNAL OF POWER SOURCES, v. 378, page. 404-411
- Abstract
- Controlling triple phase boundary (TPB), an intersection of the ionic conductor, electronic conductor and gas phase as a major reaction site, is a key to improve cell performances for low-temperature solid oxide fuel cells. We report a synthesis of morphologically well-defined Gd0.1Ce0.9O1.95 (GDC) embedded Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) nanofibers and their electrochemical performances as a cathode. Electrospun fibers prepared with a polymeric solution that contains crystalline Ba0.5Sr0.5Co0.8Fe0.2O3-delta particles in similar to 200 nm size and Gd(NO3)(3)/Ce(NO3)(3) precursors in an optimized weight ratio of 3 to 2 result in one dimensional structure without severe agglomeration and morphological collapse even after a high calcination at 1000 degrees C. As-prepared nanofibers have fast electron pathways along the axial direction of fibers, a higher surface area of 7.5 m(2) g(-1), and more oxygen reaction sites at TPBs than those of GDC/BSCF composite particles and core-shell nanofibers. As a result, the Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-delta nanofiber cell shows excellent performances of the maximum power density of 0.65 W cm(-2) at 550 degrees C and 1.02 W cm(-2) at 600 degrees C, respectively.
- URI
- https://www.sciencedirect.com/science/article/abs/pii/S0378775317316737?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/117310
- ISSN
- 0378-7753; 1873-2755
- DOI
- 10.1016/j.jpowsour.2017.12.065
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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