Jong-Jin YoonHyundai Motor Company · Faculty of Engineering
Jong-Jin Yoon
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7
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Publications (7)
The present invention provides a method for removing residual water in a fuel cell, which controls the humidity of purge gases to effectively remove residual water in the fuel cell and to maintain the humidity in a membrane at a constant level, thus ensuring the durability of the membrane.
For this purpose, the present invention provides a method f...
The present invention provides a fuel cell bipolar plate in which an air gap or a material layer having a heat transfer coefficient lower than that of the bipolar plate is provided so as to reduce total amount of liquid water generated in a fuel cell, thereby preventing the occurrence of flooding and reducing the time required for cold start, enhan...
We studied the degradation phenomenon of Pt catalyst in PEMFC. We used the electron microscope analysis technique including the ultra-microtome pretreatment method, FEG-SEM and TEM analysis methods for analysis of Pt nanoparticles. The Pt catalyst degradation is observed not only in electrode site but also in membrane site. We investigated these va...
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The defective layered structure of the oxide RbLaSrNb2CuO9 was transformed into the three-dimensional perovskite under high pressure (5 GPa). (RbLaSrNb2MO9)-O-II (M = Mg and Zn) prepared under high pressure could be also added to the growing list of perovskite-related phases.
A new series of well crystallized HLnTiO4(Ln= La, Nd, Sm, and Gd) and hydrated HLaTiO4·xH2O were synthesized by Na+/H+exchange of NaLnTiO4in 0.1NHNO3solutions. This protonated oxide retains the parent layered structure (P4/nmm), the layers being separated by H+ions occupying nine-coordinated Na+sites and adjacent blocks having the staggered conform...