乙酰二茂铁的电化学行为及动力学性质研究

Electrochemical behavior of acetylferrocene and its electrochemical kinetics

在0.2m ol·L-1N a2SO水溶液中,研究了乙酰二茂铁(A cetylferrocene,A F c)在玻碳电极上的循环伏安行4为,同时用电位阶跃计时库仑法(C hronocoulom etry,C C)和电位阶跃计时电流法(C hronoam perom etry,C A)测定了A F c的扩散系数D和电极反应速率常数K.实验结果表明:在所选定的支持电解质中,A F c表现出良好的电化f学氧化还原准可逆性,氧化还原峰电位差ΔE≈70m V,峰电流比Ipa/Ipc≈1.1;A Fc在玻碳电极上的电化学氧化p还原反应为一无质子参与的单电子转移过程,并且为受扩散传质所控制的电化学准可逆过程,其D和K分别f为2.04×10-5cm/s和2.88×10-3/s.

Electrochemical behaviors of Acetylferrocene (AFc) at a glassy carbon electrode in 0.2 mol/L Na2SO4 aqueous solution had been studied,and diffusion coefficient D and electrode reaction rate constant of Acetylferrocene (AFc) were also determined by Chronocoulometry (CC) and Chronoamperometry (CA) as well. Electrochemistry experimental results showed that,AFc exhibits well defined reversible redox,the peak potential differences,ΔEp and the ratio of the peak currents,Ipa/Ipc were 70 mV and 1.1,respectively. The electrochemical reaction of AFc at a glassy carbon electrode was a single electron transference dynamic process without proton participation,which was controlled by diffusion. It gave the diffusion coefficient D. The rate constant,and Kf of the electrode reaction were 2.04×10-5 cm2/s and 2.88×10-3 cm2/s,respectively.