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New Functions and their Applications of Carbon-Fluorine Bond

碳氟键的新功能及其应用

基本信息

批准号：
06044118
负责人：
NAKAJIMA Tsuyoshi
金额：
$ 4.54万
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：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

1.Synthesis and electrochemical properties of vanadium oxide fluoride-graphite intercalation compounds (GICs)Vanadium oxide fluoride-GICs were prepared at 130ﾟC from V_2O_5, F_2 and graphite. IR,XPS and X-ray diffraction measurements revealed that the GICs were stage 2 C_* (VOF_3) F containing excess oxygens. Chronopotentiometry and impedance measurements showed that diffusion coefficients and electrical conductivities of C_<17.7> (VOF_3) F and C_<20.4> (VOF_3) F were 3.8*10^<-10>cm^2s^<-1>,9.3*10^<-7> Scm^<-1> and 4.5*10^<-10> cm^2s-1,2.7*10^<-7> Scm^<-1>, respectively.2.Synthesis of fluorine-graphite intercalation compounds using high oxidation state transition metal fluorides as catalysts.The fluorine-graphite intercalation compounds were synthesized at room temperature and -80ﾟC using AgF_3 or NiF_3 as a catalyst. The products were a mixture of stage 1+2 to stage 4 compounds with compositions, C_4F-C_<15>F.Main products were mixtures of stage 2 and 3 with compositions, C_9F-C_<10>F.Stage 1 phase with pyrolytic graphite sheet showed a large c-axis repeat distance, 1.03 nm, indicating the formation of biintercalation phase consisting of semi-ionic and nearly ionic fluorines.3.Electrochemical properties of carbon-fluorine compositeElectrochemical measurements in sulfuric acid and sodium chloride solutions showed that the corrosion was much less in carbon-fluorine compsite than in pure nickel. Monobromobenzene suspended in aqueous solution was selectively reduced at carbon-fluorine composite electrode.

1.以V_2O_5、F_2和石墨为原料，在130 ℃下制备了氟氧化钒-石墨层间化合物（V_2O_5-GICs）。IR、XPS和X-射线衍射分析表明，GIC为含过量氧的2C_*（VOF_3）F。计时电位法和交流阻抗法测试结果表明，C_<17.7>（VOF_3）F和C_<20.4>（VOF_3）F的扩散系数和电导率分别为3.8 × 10 ~<-10>（-2）cm ~（-2）s <-1><-7><-1><-10>~（-1）和9.3 × 10 ~（-2）<-7>Scm ~（-1），C_（VOF_3）F的电导率分别为4.5 × 10 ~（-2<-1>）cm ~（-1）和2.7 × 10 ~（-2）Scm ~（-1）。产物主要为<15>C_9 F-C_ F的第2和第3阶段<10>化合物的混合物。热解石墨片的第1阶段化合物具有较大的c轴重复距离（1.03 nm），表明形成了由半离子和近离子氟组成的双插层相。3.碳-氟复合材料的电化学性能在硫酸和氯化钠溶液中的电化学测试表明，碳-氟复合材料的腐蚀性远小于纯镍。悬浮于水溶液中的一溴苯在碳氟复合电极上被选择性还原。