权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on Application of Fluorine Materials

氟材料应用研究

基本信息

批准号：
03044083
负责人：
NAKAJIMA Tsuyoshi
金额：
$ 3.52万
依托单位：
kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03044083/
关键词：
Graphite intercalation compound Fluorine Transition metal fluoride Rare earth element oxide fluoride Heteroatom compound

项目摘要

The following results have been obtained from the cooperative study on the synthesis and applications of fluorine compounds.1.Electrochemical property of qraphite compoundsGraphite 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 graphiteHighly 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 compoundsSurface 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 compoundsThe redox reactions of Se<@D12+@>D1 (] SY.dblharw.[) Se and Te<@D12+@>D1 (] SY.dblharw.[) Te have been found. Less

在氟化合物的合成和应用方面的合作研究中获得了以下结果：石墨化合物的电化学性质以天然石墨粉为原料，在含氟气氛下合成了氟化钒石墨插层化合物。所得化合物为第2阶段C_<22>VF_6 - C_<17>VF_6和第1阶段C_<12>VF_6 - C_<10>VF_6。以锂为阳极，在碳酸丙烯酯- 1 M LiClO_4溶液中考察了这些化合物的电化学性能。在电流-电位曲线上观察到三个还原峰。随着插层氟化钒和氟共存浓度的降低，在-0.15 V和-1.50 V处出现了两个峰，而在+0.10 V和-0.9 V处出现了第三个峰。C_xF的电化学还原表明，随着氟含量的降低，还原峰向负电位偏移。VF_3的还原峰在…More -1.3 V处出现。这些结果表明VF_5和氟的电化学还原。高氟化石墨的合成在含少量MoF_6或SbF_5作为天然石墨粉氧化剂的无水HF液中合成了高氟化石墨。所得化合物为一级C_<2.0>F - C_<2.4>F。晶格参数a_0由石墨基体的2.462 A增加到2.467 ~ 2.473 A， c轴重复距离在10.7 ~ 12.0 A之间。大的c轴重复距离意味着离子键氟原子和共价键氟原子插入到每一个其他碳层，形成双插层相。XPS和IR光谱分析表明碳-氟共价键的存在。石墨化合物的表面自由能和电化学应用氟-石墨化合物的表面性质取决于碳氟键的性质。接触角测量表明，C_xF的表面自由能与石墨接近，但其极性组分远大于石墨。这意味着C_xF比石墨具有更高的润湿性。另一方面，具有共价键的氟化石墨的表面自由能远小于C_xF和石墨。疏水性已被应用于有机化合物电氟化的新型疏水镍电极。杂原子化合物的结构和电化学性质。Se<@ d12 +@>D1 (] SY.dblharw。[1]李建平，李建平，李建平，等。[)找到了。少