计时电流法测定Fe^(3+)在离子液体BPBF_4中的扩散系数  

Measurement of Diffusion Coefficient of Fe^(3+) in Ionic Liquid BPBF_4 by Chronoampermetry

作　　者：杨家振[1] 金一[1] 潘伟[1] 臧树良[1] 

机构地区：[1]辽宁大学化学系,沈阳110036

出　　处：《高等学校化学学报》2005年第6期1146-1148,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20041005)资助.

摘　　要：The chronoampermetry was used to measure the Fe3+ diffusion coefficient of 0.031 16 mol/kg of FeCl3 in the ionic liquid, BPBF4, at GC working electrode referred to Al/Al3+ and at different scan rates over the temperature range from 293.15 to 343.15 K. Since the Fe3+ reduction reaction is a reversible process with one transfer electron, according to Cottrell′s equation, the values of diffusion coefficient of Fe3+ at different temperatures were estimated. As temperature increases, the values of the diffusion coefficient also increase owing to the diminution of the BPBF4 viscosity. The values of diffusion coefficient were fitted with the method of least-square according to Arrenius′ equation, and value of diffusion activation energy of Fe3+, ED=49.5 kJ/mol, was obtained from Arrenius′ slope.The chronoampermetry was used to measure the Fe^(3+) diffusion coefficient of 0.031 16 mol/kg of FeCl_3 in the ionic liquid, BPBF_4, at GC working electrode referred to Al/Al^(3+) and at different scan rates over the temperature range from 293.15 to 343.15 K. Since the Fe^(3+) reduction reaction is a reversible process with one transfer electron, according to Cottrell′s equation, the values of diffusion coefficient of Fe^(3+) at different temperatures were estimated. As temperature increases, the values of the diffusion coefficient also increase owing to the diminution of the BPBF_4 viscosity. The values of diffusion coefficient were fitted with the method of least-square according to Arrenius′ equation, and value of diffusion activation energy of Fe^(3+), E_D=49.5 kJ/mol, was obtained from Arrenius′ slope.

关 键 词：离子液体 计时电流法 扩散系数 扩散活化能 四氟硼酸正丁基吡啶 

分 类 号：O646[理学—物理化学]