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ALD YSZ 연료극 중간층 박막 적용을 통한 고체 산화물 연료전지의 성능 향상
안지환,김형준,유진근,오성국,An, Jihwan,Kim, Hyong June,Yu, Jin Geun,Oh, Seongkook 한국마이크로전자및패키징학회 2016 마이크로전자 및 패키징학회지 Vol.23 No.3
본 논문은 원자층 증착법을 이용해 증착된 YSZ 박막을 산화 세륨계 전해질 기반 고체 산화물 연료전지의 연료극 중간층으로 적용한 결과를 보여준다. $500^{\circ}C$ 이상의 고온에서는 산화 세륨계 전해질의 전기전도도가 상승하여 이를 전해질로 사용한 고체 산화물 연료전지의 개회로 전압이 하강하고 성능이 저하된다. 원자층 증착법을 이용해 연료극 측 전해질 표면에 증착된 YSZ 박막은 얇은 두께(60 nm)에도 불구하고 산화 세륨계 전해질 표면을 완벽하게 도포함으로써, 전해질을 관통하는 전자의 흐름을 막아 개회로 전압을 최대 20%까지 상승시켰다. 이를 통해 $500^{\circ}C$에서의 최대 전력 밀도는 52%가 상승하였다. This paper demonstrates the successful application of yttria-stabilized zirconia thin films deposited by atomic layer deposition to the anode-side interlayer for cerium oxide electrolyte based solid oxide fuel cell. At the operating temperature over $500^{\circ}C$, the electrical conductivity of cerium oxide electrolyte is known to dramatically increase and, therefore, the open circuit voltage of the cell decreases leading to the decrease of the performance. Ultra-thin (60 nm) atomic layer deposited yttria-stabilized zirconia thin film in this study conformally coated the anode-side surface of the cerium oxide electrolyte and efficiently blocked the electrical conduction through the electrolyte. Accordingly, the open circuit voltage increased by up to 20%, and the maximum power density increased by 52% at $500^{\circ}C$
이준호(Jun Ho Lee),김형준(Hyong June Kim),안지환(Jihwan An),안효석(Hyo Sok Ahn) Korean Society for Precision Engineering 2022 한국정밀공학회지 Vol.39 No.2
Interest in the use of thin film of Ruthenium-Samaria doped ceria cermet (Ru-SDC) as anode in solid oxide fuel cells is increasing due to its high oxygen storage capacity and high chemical and thermal stability. To have enough structural integrity between sputtered Ru-SDC films and underlying substrates, good adhesion property is required. In this work, scratch resistance and failure mode for Ru-SDC films with various SDC composition were investigated using a scratch test method employing linearly increasing load from 1 to 50 N using a 200 μm radius Rockwell C indenter. Scratched surfaces were examined with a field emission scanning electron microscope. Chemical compositions in scratch tracks were analyzed by energy dispersive X-Ray spectroscopy. Critical loads for films with different SDC ratios were assessed and associated failure modes were identified. The highest scratch resistance among tested film compositions was the one that contained 50% of SDC. Failure modes of tested films regardless of the ratio of SDC were identified to be the initiation of tensile cracks with rapid increase of friction coefficient followed by chipping, and eventually the generation of a severe crack network.
Pt-Ru Alloy Catalysts with Doped CeO₂ Interlayer for Methane Conversion
길민종(Min Jong Kil),박희성(Heesung Park),김형준(Hyong June Kim),양병찬(Byung Chan Yang),이제민(Jemin Lee),김예슬(Ye Seul Kim),선호중(Hojoong Sun),봉철우(Cheolwoo Bong),박문수(Moon Soo Bak),안지환(Jihwan An) Korean Society for Precision Engineering 2020 한국정밀공학회지 Vol.37 No.10