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1992 Fiscal Year Final Research Report Summary

Study on Application of Fluorine Materials

Research Project

Project/Area Number 03044083
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research Institutionkyoto University

Principal Investigator

NAKAJIMA Tsuyoshi  Kyoto University, Associate Professor, 工学部, 助教授 (50026233)

Co-Investigator(Kenkyū-buntansha) HERBERT Walt  ゲッチンゲン大学, 無機化学研究室, 教授
ALAIN TRESSA  国立科学研究センター, 固体化学研究室, 教授
DIDIER DEVIL  ピエールマリーキュリー大学, 電気化学研究室, 教授
MARIUS CHEML  ピエールマリーキュリー大学, 電気化学研究室, 教授
WATANABE Nobuatsu  Applied Science Research Institute, President, 所長 (30025803)
鄭 容宝  応用科学研究所, 室長 (50188653)
TAKASHIMA Masayuki  Fukui University, associate Professor, 工学部, 助教授 (60115300)
KOBAYASHI Hiroshi  Kyushu University, Professor, 機能物質科学研究所, 教授 (10037731)
ROESKY Herbert Walter  University of Goettingen, Professor
TRESSAUD Alain  Laboratory of Solid State Chemistry of CNRS, Professor
DEVILLIERS Didier  University of Pierre and Marie Curie, Professor
CHEMLA Marius  University of Pierre and Marie Curie, Professor
CHONG Young-bo  Applied Science Research Institute, Chief Researcher
Project Period (FY) 1991 – 1992
KeywordsGraphite intercalation compound / Fluorine / Transition metal fluoride / Rare earth element oxide fluoride / Heteroatom compound
Research Abstract

The following results have been obtained from the cooperative study on the synthesis and applications of fluorine compounds.
1.Electrochemical property of qraphite compounds
Graphite intercalation compounds of vanadium fluoride have been synthesized from natural graphite powder in a fluorine atmosphere. The compounds obtained were stage 2 C_<22>VF_6 - C_<17>VF_6 and stage 1 C_<12>VF_6 - C_<10>VF_6. The electrochemical property of these compounds were examined in propylene carbonate - 1 M LiClO_4 solution with Li anode. Three reduction peaks were observed in the current -potential curves. Two peaks at -0.15 and -1.50 V were common in all the samples, however, the third peak was shifted from +0.10 to -0.9 V with decreasing concentration of intercalated vanadium fluoride and coexisting fluorine. Electrochemical reduction of C_xF has revealed that the reduction peak is shifted to the negative potential with decreasing fluorine content. Furthermore the reduction peak for VF_3 was observed at … More -1.3 V. These results suggest the electrochemical reduction of VF_5 and fluorine.
2.Synthesis of highly fluorinated graphite
Highly fluorinated graphite has been synthesized in anhydrous liquid HF containing a small amount of MoF_6 or SbF_5 as an oxidizer of natural graphite powder. The obtained compounds were stage 1 C_<2.0>F - C_<2.4>F. The lattice parameter a_0 was increased from 2.462 A of graphite host to 2.467 - 2.473 a, and c-axis repeat distance was in the range of 10.7 to 12.0 A. The large c-axis repeat distance means that ionically bonded fluorine atoms and covalently bonded ones are inserted in every other carbon layer, forming a bi-intercalation phase. XPS and IR spectroscopy have indicated the existence of C-F covalent bonds.
3.Surface free energy and electrochemical application of graphite compounds
Surface properties of fluorine-graphite compounds vary depending on the nature of carbonfluorine bonds. Contact angle measurement has revealed that the surface free energy of C_xF is close to that of graphite itself, however, the polar component of C_xF is much larger than that of graphite. This means that C_xF has higher wettability than graphite. On the other hand, the surface free energy of graphite fluoride with covalent bond is much smaller than those of C_xF and graphite. The hydrophobic nature has been applied to the new hydrophobic nickel electrode for electrofluorination of organic compounds.
4.Structure and electrochemical property of heteroatom compounds
The redox reactions of Se<@D12+@>D1 (] SY.dblharw.[) Se and Te<@D12+@>D1 (] SY.dblharw.[) Te have been found. Less

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] K. AMINE: "Optical and Transport Properties of New Transition Metal Fluoride Graphite Intercalation Compounds" J.Flurine Chem.57. 35-43 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Tre ssaud: "Synthesis,Structu ral aud Physical Chanacterizations of Transition Metal Fluoride IGIC′s" Eur.J.Soled State Inorg.Chem.29. 947-959 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.NAKAJIMA: "Surface Free Energy and Chemical Bonding of Fluorine-Graphite Intercalation Compounds" J.Fluorine Chem. 57. 83-91 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.TAKASHIMA: "Reaction between Rare Earth Oxides and Elementary Fluorine I.Fluorination of Neodymeum Oxide" Eur.J.Solid State Inorg Chem.29. 691-703 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.CHONG: "Nodification of Carbon Fiber Surfaces by Direct Fluornation" J.Fluorine Chem.57. 169-175 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] D.K.KENNEPOHL: "Preparation and Characterization ofF_3Te(map)and the Structure of cl_3Te(map)(map-2-(methylamino)pyridinato)" Z.Naturforsch. 476. 5-8 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K Amine: "Optical and transport properties of new transition metal fluoride/graphite intercalation compounds" J. Fluorine Chem.57. 35-43 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A. Tressaud: "Synthesis, structural and physical characterizations of transition metal fluoride/GIC's" Eur. J. Solid State Inorg. CHem.29. 947-959 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Nakajima: "Surface free energy and chemical bonding of fluorine-graphite intercalation" J. Fluorine Chem.57. 83-91 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Takashima: "Reaction between rare earth oxides and elementary fluorine I. fluorination of neodymium oxide" Eur. J. Solid State Inorg. Chem.29. 691-703 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Chong: "Modification of carbon fiber surfaces by direct fluorination" J. Fluorine CHem.57. 169-175 (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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