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 temperat...
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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.
探索Nd(Ⅲ)离子在活性电极表面原位还原机制对优化熔盐电解制备Pr-Nd合金工艺过程具有重要的理论和现实意义。本研究采用扫描电化学显微技术(SECM)与计时电流分析相结合的方法,通过产生-收集模式原位分析Nd(Ⅲ)离子在不同电位条件下Ni阴极基体微区的电流响应及形核规律。结果表明,随着施加在Ni阴极基体表面电位在-0.6~-1.0 V (***/AgCl)范围内负移,表面活性位点逐渐增多且分布更均匀,电流峰强度最高值由低于0.003μA逐渐增大至0.004μA。水溶液体系中激活的Nd(Ⅲ)离子在Ni阴极表面的二维形核区域不断增大,三维形核活性位点也不断增加且均匀分布。Nd(Ⅲ)离子在Ni基电极表面的主要形核方式为瞬时形核,Nd(Ⅲ)离子扩散系数约为8.57×10^(-9)m^(2)/s。
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