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중간세공탄소를 담체로 사용한 직접메탄을 연료전지용 Pt/C 촉매제조
하승백,김현수,최재식,정원섭,이호인 한국공업화학회 2003 응용화학 Vol.7 No.2
For the direct methanol fuel cell, the expensive cost of Pt is one of the most important factors. In this study, various kinds of support were synthesized and chosen for highly dispersed catalysts which need less amount of Pt and show higher activity. A mesoporous carbon was selected as a support which has 5 times larger specific surface area than Vulcan XC-72, a commercial support. Such a large surface area gave an advantage in the dispersion of Pt, but a disadvantage in electric conductivity which could be solved by increasing the carbonizaton temperature in the preparation of mesoporous carbon. These prepared mesoporous carbons were used as supports of Pt. Among the catalysts, the catalyst using mesoporous carbon carbonized at 1000 ℃ showed better activity than the catalyst using Vulcan XC-72 as a support showing the best activity. From the XRD analysis, the activity was proportional to the dispersion of Pt.
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.
PtCeO_x/C와 Pt/CMnO_x의 제조와 메탄올의 전기화학적 산화반응에의 응용
조영진,최재식,하승백,하흥용,오인환,홍성안,이호인 한국공업화학회 2002 응용화학 Vol.6 No.2
This work dealt with the catalytic behavior of PtCeO_x/C catalysts with different Pt:Ce molar ratios. The catalysts were prepared by co-impregnation and their activities on MeOH electro-oxidation were evaluated by dynamic potential methods. Their properties were also investigated by means of physico-chemical characterization(XRD, TPR and BET). Carbon-manganese oxide composite(CMnO_x) as a support in DMFC anode was adopted. CMnO_x with or without heat-treatment was used for supporting Pt, and each of them showed two to three times higher activity on MeOH electro-oxidation, respectively. From the results of various characterizations, CMnO_x was believed to have better properties than carbon but for specific surface area.