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Study on the surface modification of submicron gadolinium-doped ceria electrolyte on nanoporous substrate using atomic layer deposition technique
원자층 증착법을 이용한 나노다공성 기판에 지지된 가돌리늄이 도핑된 세리아 초박막 전해질의 표면개질에 관한 연구

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Authors
지상훈
Advisor
차석원
Major
융합과학기술대학원 지능형융합시스템학과
Issue Date
2015-08
Publisher
서울대학교 융합과학기술대학원
Keywords
Atomic layer depositionInterfaceNanoscale electrolyteGadolinium-doped ceriaSolid oxide fuel cell
Description
학위논문 (박사)-- 서울대학교 융합과학기술대학원 : 지능형융합시스템전공, 2015. 8. 차석원.
Abstract
Oxygen-ion conducting and thin film solid oxide fuel cells fabricated by separate vacuum deposition methods (atomic layer deposition (ALD) and sputtering) were electrochemically evaluated at temperatures below 500oC and their material properties were investigated by means of chemical, structural, and microstructural analyses. An anodic aluminum oxide (AAO) membrane with well-arrayed nanopores was used as a reliable substrate to stack up the thin film components of the bottom anode, the top cathode, and the intermediate electrolyte. ALD-deposited yttria-stabilized zirconia of a few tens of nanometers directly deposited onto the anode-coated AAO substrate efficaciously prevented gadolinium-doped ceria (GDC) thin film electrolyte from being exposed to a high-temperature reducing atmosphere, a condition which lowers the physicochemical stability of ceria. Thinning of the ALD YSZ-blocked GDC thin film electrolytes on the anode-coated AAO substrate led to faster oxygen reduction reaction kinetics through electrolyte nanostructuring originating from substrate-dependent growth and an increase in the surface grain boundary density at the cathode/electrolyte interface. The nanothin and dense ALD-deposited platinum (Pt) deposited onto the nanostructured GDC thin film electrolyte exhibited highly catalytic activity, showing that it is capable of replacing the physical vapor deposition-deposited thicker Pt thin film cathode.
Language
English
URI
https://hdl.handle.net/10371/122394
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Graduate School of Convergence Science and Technology (융합과학기술대학원)Dept. of Transdisciplinary Studies(융합과학부)Theses (Ph.D. / Sc.D._융합과학부)
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