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지하배관에서의 양극 배치에 따른 전위분포에 대한 이론적 고찰
孫太源,張民煥,朱宰伯 弘益大學校 科學技術硏究所 2007 科學技術硏究論文集 Vol.18 No.-
Since corrosion IS an electrochemical oxidation reaction, it requires an anode, a cathode, an electron pathway and an electrolyte. The primary current distribution is a basic phenomenon of polarization system which is formed between electrolyte and electrode surface. In the present study, impressed current cathodic protection system is taken to prevent the corrosion of underground pipe. Using Flexpde, a solver of differential equations, the primary current distribution is analyzed according to the anode location in underground pipe. The effects of anode location on the current distribution need to be realized for an elementary design. The potential of underground pipe, -0.8 ~ -0.9 Volt, is recommended as a guideline in many papers. As the distance between anode and pipe is about 5m, the protection is thought to be effective. To locate the anode toward the left or right other than center is shown to be good for the protection.
개질된 가스를 이용한 PEMFC운전에 있어서의 전기화학적 특성 연구
申秀美,孫太源 弘益大學校 科學技術硏究所 2002 科學技術硏究論文集 Vol.13 No.-
Proton exchange membrane fuel cells(PEMFCs) are gaining popularity due to their benefits such as environmental friendliness and increased fuel efficiency. Because of the difficulties inherent to storing hydrogen, liquid fuel are reformed into hydrogen rich gas. This reformate also contains carbon monoxide that has been shown to poison the platinum catalyst used in PEMFC systems at concentrations as low as 10 ppm. The aim of this work is to study kinetic parameters of the electrochemical oxidation of hydrogen and carbon monoxide on the catalyst layer such as Pt/C, Ru/C, Pt/C+Ru/C. This study was examined using the rotating disk electrode technique in 0.5M H2SO4. Electrooxidation current density was Pt/C 〉 Ru/C 〉 Pt/C+Ru/C at Ar/H2 mixture gas purging. In the presence of CO, electrooxidation current density was increased at RDE electrode with rotating speed of 2500rpm higher than 0rpm and it was Pt/C〉Ru/C〉 Pt/C+Ru/C of descending series (between 600mV and 1000mV).