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Lee S.-H.,Sunchon National University | Mun J.-Y.,Sunchon National University | Kim Y.-S.,ETIS Co | Chu C.-H.,ETIS Co | And 5 more authors.
Korean Chemical Engineering Research | Year: 2016

Microbial fuel cells (MFC) were operated with pig wastes and PEMFC (Proton Exchange Membrane Fuel Cells) MEA (Membrane and Electrode Assembly). Performance of hydrocarbon membrane was compared with that of perfluoro membrane at MFC condition. Sulfonated-Poly(Arylene Ether Sulfone) was used as hydrocarbon membrane and Gore membrane was used as perfluoro membrane. OCV of sPAES MEA was 50mV higher than that of Gore MEA and power density of sPAES MEA was similar that of Gore MEA. Reinforcement of sPAES membrane stabilized the performance of MEA in MFC. The highest performance was obtained at temperature of 45 °C and with culture solution circulation rate of 50 ml/min. The highest power density was 1,100 mW/m2 at optimum condition in MFC using pig waste.

Jeong J.-H.,Sunchon National University | Song M.-H.,Sunchon National University | Chung H.-B.,Sunchon National University | Lee M.-S.,Sunchon National University | And 8 more authors.
Korean Chemical Engineering Research | Year: 2015

Recently, direct formic acid fuel cells (DFAFC) among direct liquid fuel cells is studied actively. Economical hydrocarbon membranes alternative to fluorinated membranes for DFAFC's membrane are receiving attention. In this study, characteristics of sulfonated poly(ether ether ketone, sPEEK) and sulfonated poly(arylene ether sulfone, PAES) membranes were compared with Nafion membrane at DFAFC operation condition. Formic acid crossover current density of hydrocarbon membranes were lower than that of Nafion 211 fluorinated membrane. I-V performance of sPEEK MEA(Membrane and Electrode Assembly) was similar to that of Nafion 211 MEA due to similar membrane resistance each other. sPEEK MEA with low formic acid crossover showed higher stability compared with Nafion 211 MEA.

Park E.-K.,Sungkyunkwan University | Kim J.-H.,Sungkyunkwan University | Lee D.-H.,Sungkyunkwan University | Kim K.-S.,Kolon Research Institute | And 3 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2015

Printed electronics have surfaced with a lot of interest recently. This paper reports development of a non vacuum process for fabricating poly(3-hexylthiophene):[6,6]-pheny-C61-butyric acid methyl ester organic solar cells (OSCs) using ink-jet printing technique. The printing conditions of different layers were optimized to avoid the coffee ring effect and the Marangoni effect. The effect of substrate's temperature and drop spacing size was compared to obtain uniform layers. We controlled the substrate temperature ranging from 30 °C to 80 °C and varied the spacing size between two lines ranging from 10 μm to 80μm during printing. The device characteristics were analyzed using alpha step and solar simulator. The optimized printed conditions for ZnO are 50 °C substrate temperature and 50 μm spacing size. For the active layer, PEDOT:PSS and Ag electrode, the optimized conditions are 50 DC/50 μm, 30 °C/30μm and 80 °C/80 μm, respectiveiely. The power conversion efficiency of the OSCs fabricated with optimized printing condition is 1.25%. © 2015 American Scientific Publishers.

Hwang B.,Sunchon National University | Chung H.-B.,Sunchon National University | Lee M.-S.,Kolon Research Institute | Lee D.-H.,Kolon Research Institute | Park K.,Sunchon National University
Korean Chemical Engineering Research | Year: 2016

The effects of relative humidity, current density and temperature on the ionic conductivity were studied in PEMFC (Proton Exchange Membrane Fuel Cell). Water contents and water flux in the electrolyte membrane largely affected ion conductivity. The water flux was modelled and simulated by only electro-osmotic drag and back-diffusion of water. Ion conductivities were measured at membrane state out of cell and measured at MEA (Membrane and Electrode Assembly) state in condition of operation. The water contents in membrane increase as relative humidity increased in PEMFC, as a results of which ion conductivity increased. Current enhanced electro-osmotic drag and back diffusion and then water contents linearly increased. Enhancement of current density results in ion conductivity. Ion conductivity of about 40% increased as the temperature increased from 50°C to 80°C.

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