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PEMFC 용 Pt 담지 촉매의 Pt 담지비에 따른 성능변화
조용훈(Y. H. Cho),조윤환(Y. H. Cho),박현서(H. S. Park),성영은(Y. E. Sung) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
This study focuses on a determination of amount of Pt in the Pt/C for catalysts of polymer electrolyte membrane fuel cells (PEMFC). PEMFC offer low weight and high power density and being considered for automotive and stationary power applications. The PEMFC behavior is quite complex is influenced by several factors, including catalysts and structure of electrode and membrane type. Catalyst of electrode is important factor for PEMFC. One of the obstacles preventing polymer electrolyte membrane fuel cells from commercialization is the high cost of noble metals to be used as catalyst, such as platinum. To effectively use these metals, they have to be will dispersed to small particles on conductive carbon supports. The optimal amount of Pt in Pt/C was investigated by using polarization curves in single cell with H₂/O₂ operation.
이강인(K. I. Lee),박민수(M. S. Park),조용훈(Y. H. Cho),조윤환(Y. H. Cho),성영은(Y. E. Sung),주종남(C. N. Chu) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Mobile fuel cell is highlighted in these days because mobile fuel cell can contain more energy than existing batteries. Nowadays mobile devices like cellular phone, PMP(portable multi-media player), notebook, and etc. need more energy. But exiting batteries like Li-ion or Ni-MH batteries are not going to satisfy such demands. In this paper, mobile fuel cell is developed. Its size is 50*70*8㎜ and it is made of aluminium plates. The fuel cell type is PEM and the fuel is pure hydrogen and oxygen.
탄탈륨 산화물 박막의 전기화학적 성장과 광전기화학적 응용
성영은,안광순,염준호,정도진 한국공업화학회 1999 응용화학 Vol.3 No.2
Thin films of tantalum oxide (Ta₂O_5) were formed electrochemically on tantalum electrode in several electrolytes at different applied voltages. The particle and pore sizes of oxide films were various depending upon the electrolytes. The thickness and structure of electrochemically grown oxides were examined using X -ray photoelectron spectroscopy (XPS), SEM, photoluminescence (PL), electroluminescence (EL) and cyclic voltammetry (CV). EL emissions of rare earth metal Tb³+ and organic Ru(bpy)₃²+ incorporated-Ta/Ta₂O_5 electrodes in aqueous solutions were observed. Since new EL emission energies are smaller than the band gap of 4.1 eV of Ta₂O_5, the resulting omissions are considered to be generated from surface states at the oxide band gap region. Incorporated inorganic and organic species are supposed to act as the luminescence centers for free electrons and holes. Since the emission spectra depend upon the incorporated chemical species and their concentrations, metal oxide films can be used for phosphor layers and analytical sensing probes by the controlled introduction of the label materials to produce surface states.
박경원,이설아,오인환,남석우,하홍용,임태훈,홍성안,성영은 한국공업화학회 1999 응용화학 Vol.3 No.2
Direct methanol fuel cell (DMFC) needs better anode electrocatalysts than Pt, which suffers from self CO poisoning phenomena. The improved oxidation kinetics enabled by Pt promoters such as Ru, Sn, Mo, W or Os has been attributed to a bifunctional and/or an electronic effect. The alloy electrode materials were prepared by reduction and colloidal methods. It was generally proved that binary system such as those based on Pt, these components are much more active in promoting DMFC reactions than pure platinum catalysts. The oxidation onset on pure Pt was 0.45 V and the potentials decreased with alloying. Pt-Ru showed the lowest onset potential. However, chronoamperometry provided high stability at Pt-Mo on CO poisoning, which shows a promising candidate as DMFC anode material. The strategy of ternary or quaternary electrocatalysts, the effects of synthesis and particle sizes will be discussed.