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P-1000 : Surface Treatment of Nafion® Membrane and its Effects on Cell Performance
( Mani Prasanna ),조은애,하흥용,홍성안,오인환 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Proton exchange membrane fuel cell (PEMFC) is considered as a clean and efficient energy conversion device for mobile and stationary applications. Among all the components of the PEMFC, the interface between the electrolyte and electrode catalyst plays an important role in determining the cell performance since the electrochemical reactions take place at the interface in contact with the reactant gases. Therefore, to increase the interface area and obtain a high-performance PEMFC, surface of the electrolyte membrane was roughened by Ar+ beam bombardment. The results imply that by modifying surface of the electrolyte membrane, platinum loading can be reduced significantly without performance loss. To optimize the surface treatment condition, effects of ion energy and ion dose density on characteristics of the membrane/electrode interface were examined by measuring the cell performance, impedance spectroscopy, and cyclic voltammograms. Surface of the modified membranes were characterized using scanning electron microscopy, atomic force microscopy, and FT-IR.
고분자 전해질 연료전지용 Sulfonated Poly(ether sulfone)의 합성 및 특성 평가
김형준(Krishnan, N.N.),조은애(Kim, H.-J.),오인환(Prasanna, M.),홍성안(Cho, E.-A.),임태훈(Oh, I.-H.),Hong, S.-A.,Lim, T.-H. 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Sulfonated poly(ether sulfone) copolymers (PESs) were synthesized using hydroquinone 2-potassium sulfonate (HPS) with other monomers (bisphenol A and 4-fluorophenyl sulfone). PESs with different mole% of hydrophilic group were prepared by changing the mole ratio of HPS in the polymerization reaction. The chemical structure and the thermal stability of these polymers were characterized by using ¹H-NMR, FT-IR and TGA techniques. The PES 60 membrane, which has 60 mole% of HPS unit in the polymer backbone, has a proton conductivity of 0.091 S/cm and good insolubility in boiling water. The TGA showed that PES 60 was stable up to 272?C with a char yield of about 29%;at;900?C;under;N₂ atmosphere. To investigate the single cell performance, the catalyst coated PES 60 membrane was used and a single cell test was carried out using H₂/O₂ gases as fuel and oxidant at various temperatures. We observed that the cell performance was enhanced by increasing the cell temperature. A current density of 1400 mA/cm² at 0.60 V was obtained at 70?C.