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¡¾·ÖÏí¡¿paper-show-Ionization-induced enhancement of hydrogen storage
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1,×÷ÕߣºChun-Sheng Liu and Zhi Zeng(µÚÒ»×÷Õß) 2,ËùÔÚѧУ»òµ¥Î»£¨ÄãËùÔÚµ¥Î»£©£ºKey Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People¡¯s Republic of China 3,ÎÄÕÂÌâÄ¿ £ºIonization-induced enhancement of hydrogen storage in metalized C2H4 and C5H5 molecules 4,ÆÚ¿¯Ãû £ºPHYSICAL REVIEW B 5,Äê·Ý£¬¾í£¨ÆÚ£©£¬ÆðÖ¹Ò³Âë £ºVolume 79,2009, Pages 245419 6,Ó°ÏìÒò×Ó :3.475 7,ÎÄÕÂÁ´½Ó £ºhttp://prb.aps.org/abstract/PRB/v79/i24/e245419 8,ÕªÒª£º The capacity of Li2C2H4+ and TiC5H5+ as hydrogen storage media is studied using first-principles densityfunctionaltheory. The present results indicate that these complexes not only enhance the metal bond strength but also increase the number of nondissociative hydrogen molecules attached. The adsorption capacity of Li2C2H4+27.5 wt % is doubled compared with that of Li2C2H4. The enhanced electrostatic field around the Li atom originating from the increased charge transfers from Li to C2H4+ accounts for the high capacity. For TiC5H5+, the first H2 is adsorbed in molecular form, while it is adsorbed dissociatively on the TiC5H5 complex. This is due to the favorable overlap of the highest occupied molecular orbital of Ti and the lowest unoccupied molecular orbital of H2. Furthermore, the number of adsorbed H2 on TiC5H5 is limited to only four, whereas the number increases to five on TiC5H5+. The availability of the dz2 orbital of Ti in TiC5H5+ has been found to be responsible for the fifth H2 adsorption with a hydrogen uptake of 8.1 wt %. It is demonstrated that controlling the charge state of the metal-organic molecules may play a significant role in the search for hydrogen storage media. 9,ÎÄÕÂÄÉÃ×ÅÌÁ´½Ó£º±ØÐë·¢µ½ÄÉÃ×ÅÌ£¬·½±ã½ø²»ÁËÊý¾Ý¿âµÄÅóÓѲéÔÄ¡£http://d.namipan.com/d/3a5d32664 ... de063952ccf02a00600 [ Last edited by study163 on 2010-11-14 at 08:38 ] |
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