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전기화학적 방법을 이용한 저온형 연료전지용 고분산 Pt 촉매의 제조
윤봉국,최재식,김현수,임태훈,홍성안,이호인 한국공업화학회 2003 응용화학 Vol.7 No.2
Pt was deposited on carbon support by chronoamperometry. The catalytic activity for methanol oxidation was checked by CV (cyclic voltammetry) method. The amount of Pt loading was calculated by integration of I-t curve obtaining the total current used for the Pt deposition. The ECA (electrochemical active surface area) for loaded Pt was calculated from the hydrogen adsorption/desorption peaks in 0.5 M H₂SO₄solution. Pt was deposited on clean carbon electrode surface with various concentration of Pt solution (0.1 mM) was used. As the concentration of Pt increased, the specific catalystic activity of Pt decreased suggesting that, in the electrochemical reaction of Pt ion with electrode surface, Pt particles were smaller and more dispersed in low concentration of Pt solution. With this condition (0.1 mM Pt), Pt was electrodeposited on a commercial carbon support, Vulcan XC-72. Electrochemically loaded Pt catalyst had the higher ECA, and showed higher specific catalytic activity for mathanol oxidation than a commercial Pt/C catalyst.
최재식,윤봉국,하승백,정원섭,이호인 한국공업화학회 2003 응용화학 Vol.7 No.2
Direct Methanol Fuel Cell (DMFC) is based on the technology of Polymer Electrolyte Membrane Fuel Cell. DMFC has several features of environmentally benign generation of electricity and high mobility for portable electronics etc., but its main problem to overcome for commercialization is the high cost of noble metal catalysts. In this study, it was found that the Pt/C catalyst supported on carbon nano fiber had the highest catalytic activity among the catalysts supported on several carbons. The newly developed Pt/C alternative catalyst had higher catalytic activity for methanol oxidation than the Pt/C catalyst supported on Vulcan XC-72.
메조포어 물질을 이용한 TiO_2의 제조와 광촉매 산화반응에의 적용
이한수,윤봉국,우창수,김소영,He, NongYue,이호인 한국공업화학회 2003 응용화학 Vol.7 No.1
TiO_2-loaded mesoporous materials were prepared by sol-gel method. Mesoporous materials suppressed the phase transformation of TiO_2 from anatase to rutile and increased the bandgap of TiO_2 which was explained in terms of the quantum size effect. Several kinds of nano-sized TiO_2 with particle sizes of 5∼20 nm, were obtained through the removal of the mesoporous materials by etching in 2 M NaOH or the calcination under air condition. They showed good activites in the photocatalytic oxidation of 2-isopropyl-6-methyl-4-pyrimidinol.