Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
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Volume 77, Issue 8
Displaying 51-54 of 54 articles from this issue
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  • Extraction of Copper in ZSM-5 with a RTIL
    Hsin-Liang HUANG, Hong Paul WANG, Yu-Ling WEI, I-Wen SUN, Hsiu-Liang C ...
    2009 Volume 77 Issue 8 Pages 748-750
    Published: August 05, 2009
    Released on J-STAGE: March 22, 2012
    DOIhttps://doi.org/10.5796/electrochemistry.77.748
    JOURNAL FREE ACCESS
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    Speciation of copper extracted with a RTIL (room temperature ionic liquid) ([C4mim][PF6], 1-butyl-3-methylimidazolium hexafluorophosphate) has been studied by extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectroscopy in the present work. The extraction of copper in the channels of ZSM-5 with the RTIL turns out to be very effective. The least-square fitted XANES spectra show that the main copper species (Cu2+(ads) (99%)) in the channels of ZSM-5 can be extracted with the RTIL and form the Cu(mim)42+ complex. The bond distance of Cu-N in the Cu(mim)42+ is 1.96 Å with a coordination number of 3.6.
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  • Li+ Ion-exchanged Hollandite-type MnO2 in Molten Salt at Several Temperatures and Electrochemical Properties for Lithium Battery Electrodes
    Yoshihiro KADOMA, Ryo KIMURA, Koichi UI, Naoaki KUMAGAI
    2009 Volume 77 Issue 8 Pages 751-753
    Published: August 05, 2009
    Released on J-STAGE: March 22, 2012
    DOIhttps://doi.org/10.5796/electrochemistry.77.751
    JOURNAL FREE ACCESS
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    The Li+ ion-exchanged α-MnO2 with the hollandite structure have been synthesized by Li+ ion-exchanging in a LiNO3/LiCl molten salt at 250–350°C. The amounts of the lithium incorporated increased with increasing ion-exchanging temperature. The Li-Mn-O spinel phase was generated in the hollandite structure on Li+ ion-exchanging over 300°C. The electrochemical measurements indicated that the electrochemical cycling performances were significantly improved by ion-exchanging at 300°C. At a higher temperature of 350°C, however, the generation of considerable amount of the spinel phase occurred in the structure, resulting in deterioration of the electrochemical properties.
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