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고체산화물 전해질 직접탄소 연료전지의 전극 및 집전부 재질이 출력밀도에 미치는 영향
황준영(Hwang, J.Y.),윤재은(Yoon, J.E.),강경태(Kang, K.),김종훈(Kim, J.H.),이병준(Lee, B.J.) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Direct Carbon Fuel Cells (DCFCs) generates electricity directly converting the chemical energy in coal. In the present study, effects of anode and current collector materials on the power density of DCFC are investigated experimentally. The adopted DCFC system is combined type of solid oxide fuel cells (SOFC) and molten carbonate fuel cells (MCFC) with the use of a liquid-molten salt anode and a solid oxide electrolyte, proposed by SRI. Power densities of 25 mm button cells with various combination of anode materials and current collector materials are measured.
Nonlinear variation of performance for a NAFION membrane humidifier with inlet temperature elevation
황준영(Hwang, J.Y.),강경태(Kang, K.),강희석(Kang, H.S.),김종훈(Kim, J.H.) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Effect of temperature elevation of inlet air on performance of a membrane humidifier for PEMFC vehicle application was investigated both experimentally and numerically. A shell-and-tube typed gas-to-gas humidifier with Nafion membrane was tested. The experimental result showed that water transfer varies nonlinearly with the temperature elevation. Numerical analysis based on detailed modeling is also conducted on a single tube geometry to explain this nonlinear behavior. The simulation revealed that the local water flux varies nolineary and dramatically along the tube. Analysis is based on competing role of temperature increase and relative humidity decrease, both of which seriously affect water conductivity of the membrane.
Modeling of Water Transport in Porous Membrane for PEMFC Humidifer
황준영(Hwang, Jun Y.),박지용(Park, J.Y.),강경태(Kang, K.),김종훈(Kim, J.H.),김경주(Kim, K.J.),이무석(Lee, M.S.) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Water transport through the microporous membrane was modeled considering capillary condensation as well as capillary flow in porous media as a function of pore diameter and relative humidity at the surface. The present model was adopted by the numerical simulation of non-isothermal, non-homogenous flow in a shell and tube typed gas to gas membrane humidifier for PEMFC (proton exchange membrane fuel cell) and the result shows good agreement with experimental data.
Enhancement of Electrical Conductivity for Ag Grid using Electrical Sintering Method
황준영(Hwang, Jun Y.),문윤재(Moon, Y.J.),이상호(Lee, S.H.),강경태(Kang, K.),강희석(Kang, H.),조영준(Cho, Y.J.),문승재(Moon, S.J.) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Electrical sintering of the front electrode for crystalline silicon solar cells was performed applying a constant DC current to the printed lines. Conducting lines were printed on glass substrate by a drop-on-demand (DOD) inkjet printer and silver nanoparticle ink. Specific resistance and microstructure of sintered silver lines and were measured with varying DC current. To find the relation between temperature increase with changing applied current and specific resistance, temperature elevation was also calculated. Sintering process finished within a few milliseconds. Increasing applied DC current, specific resistance decreased and grain size increased after sintering. Achieved minimum specific resistance is approximately 1.7 times higher than specific resistance of the bulk silver.