저 가습에서 유리한 고분자 전해질 연료전지용 자가 가습 전극 개발
Self-Humidifying Electrodes at Low Humidity for Polymer Electrolyte Membrane Fuel Cells (PEMFCs)
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초록
Excessive humidity within polymer electrolyte membrane fuel cells (PEMFCs) interrupts the flow of reactant gases, ultimately leading to substantial reduced performance. Also, low levels of water in the electrode result in an increased ohmic resistance due to membrane drying at low humidity levels. In this study, a self-humidifying electrode was prepared by adding a hydrophilic polymer, polyvinyl alcohol (PVA), to the catalyst layer. Glutaraldehyde (GA) was employed as a crosslinking agent to prevent washing of PVA during cell operation. Non-crosslinked hydroxyl groups of PVA assist in the retention of water from the reactant gas. Improvement of the initial performance and durability is predicted at low humidity levels. Due to their water-absorbing characteristics, the novel electrodes are appropriate for applications to self-humidifying MEA.
Abstract
Excessive humidity within polymer electrolyte membrane fuel cells (PEMFCs) interrupts the flow of reactant gases, ultimately leading to substantial reduced performance. Also, low levels of water in the electrode result in an increased ohmic resistance due to membrane drying at low humidity levels. In this study, a self-humidifying electrode was prepared by adding a hydrophilic polymer, polyvinyl alcohol (PVA), to the catalyst layer. Glutaraldehyde (GA) was employed as a crosslinking agent to prevent washing of PVA during cell operation. Non-crosslinked hydroxyl groups of PVA assist in the retention of water from the reactant gas. Improvement of the initial performance and durability is predicted at low humidity levels. Due to their water-absorbing characteristics, the novel electrodes are appropriate for applications to self-humidifying MEA.
참고문헌 (13)
- Ryan O’Hayre, "Fuel cell fundamentals" (2009)
- K. Jiao, "Water transport in polymer electrolyte membrane fuel cells", Progress in Energy and Combution Science, 37(3), pp.221~291 (2011)
- S.D. Yim, "Fabrication of microstructure controlled cathode catalyst layers and their effect on water management in polymer electrolyte fuel cells", Electrochemical Acta, 56(25), pp.9064~9073 (2011)
- L. Wang, "Ionic Liquidbased composit membrane for PEMFCs operatings", Elctrochemical and Solid-Stat Letters, 15(4), pp.B44~B47 (2012)
- G. G. Kumar, "Nafion membrane modified with silica sulfuric acid for the elevated temperature and lower humidity operation of PEMFC", International J. of Hydrogen Energy, 34(24), pp.9788~9794 (2009)
- M. Amjadi, "Investigation of phsical properties and cell performance of Nafion", TiO2 nanocomposite membranes for high temperature PEM fuel cells, 2010, pp.35(17), 9252~9260
- E. Endoh, "Degradation Study of MEA for PEMFCs under Low Humidity Conditions", Electrochemical and Solid-State Letters, 7, pp.A209~A211 (2004)
- Y. Lee, "Effects of self-humidification on the dynamic behavior of polymer electrolyte fuel cells", International J. of Hydrogen Energy, 34(4), pp.1999~2007 (2009)
- H. Liang, "Self-humidifying membrane electrode assembly prepared byadding PVA as hygroscopic agent in anode catalyst layer", International J. of HydrogenEnergy, 37(17), pp.12860~12867 (2012)
- S. Hou, "Self-humidifying membrane electrode assembly prepared by adding microcrystalline cellulose in anode catalyst layer as preserve moisture", International J. of Hydrogen Energy, 39(24), pp.12842~12848 (2014)
- S. Hou, "Improvement of proton exchange membrane fuel cell performance in low-humidity 24 conditions by adding hygroscopic agarose powder to the catalyst layer", Journal of power sources, 273, pp.168~173 (2015)
- H. S. Mansur, "FTIR spectroxcopy characterization of poly (vinyl alcohol)hydrogel with different hydrolysis degree and chemically crosslinked with glutaraldehyde", Materials Science and Engineering, C, 28, pp.539~548 (2008)
- J.W. Rhim, "Crosslinked poly (vinyl alcohol) membranes containing sulfonic acid group: proton and methanol transport through membranes", Journal of Membrane Science, 238(1-2), pp.143~151 (2009)