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비백금 연료전지 촉매로서의 Co/PANi/CNT 합성 및 특성
이효준 ( Hyo June Lee ),안지은 ( Ji Eun Ahn ),김현종 ( Hun Jong Kim ),한명근 ( M. K. Han ),김한성 ( Hang Sung Kim ),이헌우 ( H. W. Lee ) 한국공업화학회 2011 응용화학 Vol.15 No.1
Platinum catalyst activity and stability is excellent in terms of fuel cells as a catalyst here. Although it is widely used, to compensate for the high price issue non-precious fuel cell catalysts are being developed. In this study, Co/PANi/CNT composite and non-precious as a catalyst for oxygen reduction was applied. Polyaniline on the interaction between cobalt and the oxygen reduction reaction and the structural characteristics observed in the impact and heat treatment was carried out according to the improved catalytic performance. Potential range is oxygen reduction reaction 0.55 V to 0.78 V(vs. NHE) after pyrolysis. Through this study, Co /PANi/CNT composites as a potential catalyst for fuel cells were non-precious.
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玄義泰,李相鎔,金漢星,高在雄,有興根 건국대학교 부설 산업기술연구소 1974 논문집 Vol.1 No.-
The effect of reducing flood magnitudes, flood stages, and flood damage by upstream reservoir regulation are investigated in this study. The analytical procedures which has been established newly, are treated through this study for 7 index stations and same number of reaches. The method of this study could be expressed briefly as following procedures. Using stage-frequency relations and the potential damage survey data, damage-frequency relations are established, and from this, average annual flood damages computed. By holding out portions of the floods with various amounts of flood control storage in 6 reservoirs in the basin, routing were made to establish modified stage-frequency relations. From damage frequency relation, average annual damages are computed with and without condition of each control volume. The study result are concluded as follows; (1)The relationship of corresponding water level between nearby stations are useful tools to adjust error of the data due to observation error and change of the gaging location. (2)The number of records about 10 years could not be applied for the statistical methods of flood frequency analysis. (3)The regional skew factors are recommended to apply flood frequency study by the log. Pearson TypeⅢ method. (4)The effect of damage reduction are greatly affected in accordance with the routed flood. Therefore application of the Typical Tributary Contribution Flood are reasonable for this type of study. (5)In the North Han, effect of damage reduction due to the location of control point are gradually increased from upstream to downward until the confluence of North and South Han. (6)In the South Han, control effect are increased from Chungju to Yeoju where the maximum effect are analyzed and then decrease gradually until the confluence. (7)Better hydrologic and topographic combinations for the flood control are existed in South Han to compare with North Han in this study results.
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