Bragg Coherent X-ray Diffraction Imaging of CeO2 Nanocrystals
- 주제(키워드) In-situ Bragg coherent X-ray diffraction imaging (BCDI) , strain dynamics , chemical expansion , Solid oxide fuel cell (SOFC) electrolyte , Gadolinium-doped CeO2
- 발행기관 서강대학교 일반대학원
- 지도교수 김현정
- 발행년도 2019
- 학위수여년월 2019. 2
- 학위명 석사
- 학과 및 전공 일반대학원 물리학과
- 실제URI http://www.dcollection.net/handler/sogang/000000064188
- UCI I804:11029-000000064188
- 본문언어 영어
- 저작권 서강대학교 논문은 저작권보호를 받습니다.
초록/요약
Solid Oxide Fuel Cell (SOFC) is paid attention for its high efficiency (>60%), environmentally friendly energy production process, and various choices of fuels. In particular, rare earth–doped cerium oxide based electrolyte is spotlighted as Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC) that operates lower temperature (400~600°C) than the high temperature (>800°C) fuel cells. In this ionic conductor, lattice strain is related to ionic conductivity and strain develops under operating condition. Chemical expansion, reflecting the correlation between stoichiometry and lattice structure, induces often strain in the solid electrolyte at operating atmosphere. Here, we present the strain developments of ionic conductor Gd-doped CeO2 (GDC) due to chemical expansion by Bragg coherent X-ray diffraction imaging technique. We observe strain development in a single GDC grain due to chemical expansion under 2% H2 in N2 condition and re-oxidation. Results thus provide insights to development and design for the ionic conductor for the fuel cell.
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