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김준호,모수인,박광선,윤정우 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.9
Sr0.92Y0.08Ti1xNixO3 (SYTN) having a perovskite structure was investigated as a direct internal steam methane reforming catalyst for use in solid oxide fuel cells. To analyze the effect of Ni-ion doping, 0, 3, and 5mol% of Ni is doped at the B-site of Sr0.92Y0.08TiO3 (SYT). On doping, each Ni2+ cation substitutes a Ti4+ cation in SYT to form an oxygen vacancy with two electron holes, thus acting as an oxygen-ion conductor. The number of oxygen vacancies increases with increase in Ni-ion doping. In particular, Sr0.92Y0.08Ti0.95Ni0.05O3 (SYTN5) shows excellent catalytic activity for steam methane reforming, yielding CH4 conversions of 0.80, 0.96, and 0.99 at 700, 800, and 900 oC, respectively, and H2-to-CO ratios of 3.38, 3.32 and 3.24 at 700, 800, and 900 oC, respectively, which are very close to the theoretical values for the steam methane reforming and water gas shift reactions. The excellent electrochemical property and high oxygen-ion conductivity of the SYTN5 anode result in good cell performance.
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Characteristics of Li2CO3 as sintering aid for Ce0.8Sm0.2O2 electrolyte in solid oxide fuel cells
박광선,모수인,김준호,윤정우 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
Owing to its excellent ionic conductivity, 20 mol% samarium doped ceria (Ce0.8Sm0.2O2, SDC) is considereda promising alternative as an electrolyte in solid oxide fuel cells (SOFCs). SDC electrolytes, however, require highsintering temperatures over 1,600 oC to attain sufficient density to be SOFC electrolytes. To lower the SDC sinteringtemperature, different amounts of Li2CO3 (0-12mol% of Li) were evaluated as a sintering aid for SDC electrolytes. TheSDC electrolyte samples with Li were sintered at 1,400 oC and were compared with SDC electrolytes sintered at1,600 oC. The SDC electrolyte with 6mol% of Li sintered at 1,400 oC (Li6SDC1400) was densified to 97.495% of theoreticaldensity (T.D.), which is similar to that achieved by the SDC electrolyte sintered at 1,600 oC (97.433% of T.D.). The improved formation of grain boundary in the Li6SDC1400 sample increased the density of the SDC, resulting inenhancement of ionic conductivity and cell performance. At 800 oC, the maximum power density of the Li6SDC1400electrolyte sample was 120.15mW/cm2.
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고체산화물 연료전지의 Anode인 Ni/YSZ에 Ni 원자층 증착 코팅의 효과
김준호,모수인,박광선,김형순,김도형,윤정우 한국마이크로전자및패키징학회 2022 마이크로전자 및 패키징학회지 Vol.29 No.1
This study is to increase the surface area and maximize the effect of the catalyst by coating a nanometersized metal catalyst material on the anode layer using atomic layer deposition (ALD) technology. ALD process is known to produce uniform films with well-controlled thickness at the atomic level on substrates. We measured the performance by coating metals (Ni) on Ni/YSZ, which is the most widely known anode material for solid oxide fuel cells. ALD coatings began to show a decrease in cell performance over 3 nm coatings. 이 연구는 원자층 증착(Atomic Layer Deposition, ALD) 기술을 사용하여 나노미터 크기의 금속 촉매 물질을연료극 층에 코팅하여 표면적을 늘리고 촉매의 효과를 극대화시키기 위한 연구이다. ALD 공정은 기판 위에 원자 수준에서 잘 제어된 두께를 갖는 균일한 막을 제조하는 것으로 알려져 있다. 우리는 고체산화물 연료전지의 연료극 물질로 가장 널리 알려진 Ni/YSZ 위에 금속(Ni)을 코팅하여 성능을 측정하였다. ALD 코팅은 3 nm 이상의 코팅에서 전지 성능의감소를 보이기 시작했다
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메탄연료사용을 위한 고체산화물 연료전지용 Reduced Graphene Oxide/Sr0.98Y0.08TiO3-δ 연료극 개발
김형순,김준호,모수인,박광선,윤정우 한국화학공학회 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.2
Solid oxide fuel cell has received more attention recently due to the fuel flexibility via internal reforming. Commonly used Ni/YSZ anode, however, can be easily deactivated by carbon coking in hydrocarbon fuels. The carbon deposition problem can minimize by developing alternative perovskite anode. This study is focused on improving conductivity and catalytic activity of the perovskite anode by introducing rGO (reduced graphene oxide). Sr0.92Y0.08TiO3(SYT) anode with perovskite structure was synthesized with 1wt% of rGO. The presence of rGO during anode fabricating process and cell operation is confirmed through XPS and Raman analysis. The maximum power density of rGO/SYT anode improved to 3 times in H2 and 6 times in CH4 comparing to that of SYT anode due to the high electrical conductivity and good catalytic activity for CH4.
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장근영 ( Geun Young Jang ),김준호 ( Jun Ho Kim ),모수인 ( Su In Mo ),박광선 ( Gwang Seon Park ),윤정우 ( Jeong Woo Yun ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.4
Sr<sub>0.92</sub>Y<sub>0.08</sub>Ti<sub>1-x</sub>V<sub>x</sub>O<sub>3-δ</sub> (SYTV) with perovskite structure was investigated as an alternative anode to utilize H<sub>2</sub>S containing fuels in solid oxide fuel cells. To improve the electrochemical performance of Sr<sub>0.92</sub>Y<sub>0.08</sub>TiO<sub>3-δ</sub> (SYT), vanadium(V) was substituted to titanium(Ti) at the B-site of the SYT perovskites. The SYTV synthesized by the Pechini method was chemically compatible with the YSZ electrolyte without additional by-products formation under the cell fabricating conditions. As increasing V substitution amounts, the oxygen vacancies increased, resulting to increasing ionic conductivity of the anode. The cell performance in pure H<sub>2</sub> at 850℃ is 19.30 mW/cm² and 34.87 mW/ cm² for a 1 mol.% and 7 mol.% of V substituted anodes, respectively. The cell performance using H2 fuel containing 1000 ppm of H<sub>2</sub>S at 850℃ was 23.37 mW/cm² and 73.11 mW/ cm² for a 1 mol.% and 7 mol.% of V substituted anodes, respectively.
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