화학공학소재연구정보센터
Journal of Power Sources, Vol.196, No.4, 2202-2210, 2011
Preparation and ion transport properties of NaY zeolite-ionic liquid composites
The physicochemical properties of protic ionic liquids (IL)-zeolite (Z) composites were investigated H-3 methylimidazolium bis(trifluoromethanesulfonyl) imide (TFSI)/NaY zeolite composites with different IL/Z weight ratios were prepared and characterized X-ray diffraction and FT-Raman measurements show the formation of NaTFSI during the preparation procedure which indicates that an ion exchange reaction is taking place during the composite preparation method N-2 physisorption shows that the zeolite pores are completely filled when IL/Z ratio is between 0 2 and 05 The water adsorption capacity of the samples decreased with IL/Z ratio The conductivity of the composite pellets increased with temperature and ionic liquid loading however significant enhancement was detected once the IL/Z weight ratio was higher than a threshold value (similar to 0 5) Moreover theoretical calculations were performed using the Effective Medium Theory in order to understand the effect of IL/Z ratio on conductivity In qualitative agreement with the experimental data the model shows a sharp increase of the conductivity right above a critical threshold value for the ionic liquid/zeolite mass ratio followed by a more moderate increase at higher loadings (C) 2010 Elsevier B V All rights reserved