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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.
침전법을 활용한 Co-Ni 전극의 제조와 용융탄산염 연료전지의 그 적용
김시열(Kim, S.Y.),류보현(Ryu, B.H.),함형철(Hahm, H.C.),한종희(Han, J.),윤성필(Yoon, S.P.),남석우(Nam, S.W.),임태훈(Lim, T.H.),이호인(Lee, H.I.) 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.1
In-situ lithiated NiO has been manufactured as a conventional cathode material of molten carbonate fuel cell (MCFC), however this material has a weakness for commercialization of MCFC because NiO is spontaneously dissolved into the electrolyte under MCFC operating conditions, resulting in short circuit between cathode and anode. In this research, therefore, Co(OH)₂-coated Ni powder was prepared by precipitation method with controlling pH at low temperature and atmospheric pressure. Modified cathode was fabricated by a conventional tape casting method and sintered at 700?C in a H₂/N₂ atmosphere, Based on characterization result, Pore size distribution and porosity was suitable for the cathode of MCFC. According to the result of dissolution, Ni solubility of modified cathode was 33% lower than that of conventional cathode. In addition, modified electrode showed a good performance from the single cell operation.
용융탄산염형 연료전지의 NiO 공기극의 용해거동에 미치는 알루미나 코팅효과에 대한 연구
류보현(Ryu, B. H.),윤성필(Yoon, S. P.),한종희(Han, J),남석우(Nam, S. W.),임태훈(lim, T.-H.),홍성안(Hong, S.-A.) 한국신재생에너지학회 2005 신재생에너지 Vol.1 No.1
The stability of alumina-coated NiO cathodes was studied in Li 0.62 /K 0.38 molten carbonate electrolyte. Alumina was effectively coated on the porous Ni plate using galvanostatic pulse plating method. The deposition mechanism of alumina was governed by the concentration of hydroixde ions near the working electrode, which was controlled by the temperature of bath solution. Alumina-coated NiO cathodes were formed to A1 2 O 3 ?NiO solid solution by the oxidation process and their Ni solubilities were were than that of NiO up to the immersion time of 100h. However, their Ni solubilities increased and were similar to that of the bare NiO cathode after 100h. It was because aluminum into the solid solution was segregated to α?LiAlO 2 on the NiO and its Product did not Play a role of the Physical barrier against NiO dissolution.
남석우(S . W . Nam),서상혁(S . H . Suh),임태훈(T . H . Lim),오인환(I . H . Oh),홍성안(S . A . Hong),임희천(H . C . Lim) 한국수소및신에너지학회 1992 한국수소 및 신에너지학회논문집 Vol.3 No.2
To improve the MCFC performance it is important to distingush between polarization losses occuring in the individual electrodes and other components. In this study a current interruption technique has been applied to a MCFC unit cell having a reference electrode to separately study the contributions of IR loss and other polarization losses. At a current density of 150?/? the IR-free polarlzaiion of a Ni anode was about 60mV while that of a NiO cathode was 130mV and the Ohmic loss of the cell was as large as 170? suggesting that both the cathode and the cell structure need further improvement. The thin-film electrode model was used to simulate the performance of the electrodes. Both andoe data and cathode data were successfully fitted.