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采用循环伏安法研究了Fe(Ⅲ)/Fe(Ⅱ)在[Bmim]BF4-FeCl3-H2O体系中的电化学行为。研究表明,在[Bmim]BF4-FeCl3-H2O体系中只观察到Fe(Ⅲ)/Fe(Ⅱ)的氧化还原反应,没有观察到Fe(Ⅱ)/Fe的氧化还原;Fe(Ⅲ)/Fe(Ⅱ)的氧化还原反应是扩散控制的可逆过程。还原峰值电流随扫描速率增大而增大,并符合Randles-Sevcik方程。Fe(Ⅲ)在[Bmim]BF4-FeCl3-H2O体系中的扩散系数与温度的关系符合Arrhenius公式,其扩散活化能为41.432 kJ/mol。
Abstract：The electrochemical behaviors of Fe(Ⅲ)/Fe(Ⅱ) redox couple in [Bmim]BF4-FeCl3-H2O system were investigated by cyclic voltammetry.The Fe(Ⅲ)/Fe(Ⅱ) rather than Fe(Ⅱ)/Fe redox reaction was observed in [Bmim]BF4-FeCl3-H2O system.It was found that Fe(Ⅲ)/Fe(Ⅱ) redox reaction is a diffusion-controlled reversible process.The reduction peak current is directly proportional to the square root of scanning rate,which can be described by Randles-Sevcik equation.The relationship between diffusion coefficient and temperature agrees well with the Arrhenius equation and the diffusion activation energy of Fe(Ⅲ) in [Bmim]BF4-FeCl3-H2O system is 41.432 kJ/mol.
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基本信息:
中图分类号:O614.811
引用信息:
[1]崔焱,华一新,李艳,等.Fe(Ⅲ)/Fe(Ⅱ)在[Bmim]BF_4-FeCl_3-H_2O体系中的电化学行为[J].有色金属(冶炼部分),2009(03):2-6.
基金信息:
国家自然科学基金资助项目(50564006); 云南省自然科学基金重点项目(2005E0004Z)
2009-06-12
2009-06-12