计时电流法测定Fe3+在离子液体BPBF4中的扩散系数

室温离子液体(简称离子液体)作为新型的反应介质和功能材料受到学术界和产业界的高度关注，正在迅速成为多学科交叉的前沿研究领域和具有良好应用前景的“绿色”高新技术，过渡金属化合物是许多重要反应的催化剂，过渡金属离子在室温离子液体中的性质是工业界关心的课题，有关过渡金属的离子液体的研究，

Measurement of Diffusion Coefficient of Fe3+ in Ionic Liquid BPBF4 by Chronoampermetry

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⁺, E_D=49.5 kJ/mol, was obtained from Arrenius' slope.