Abstract
The reduction of 1,4-benzoquinone(BQ) on Pt electrode was investigated in various ionic liquids by cyclic voltammetry(CV). Over a wide range of scan rates,two couples of redox peaks were clearly observed in cyclic voltammogram,showing a quasi reversible diffusion process of BQ with the two-step electrochemical reduction. Diffusion coefficient and activation energy were obtained from cyclic voltammogram, which displayed the increase of diffusion coefficient accompanying temperature rise from 298. 15 K to 343. 15 K. The techniques of cyclic voltammetry,in situ FTIR spectroelectrochemistry(FTIR),cyclic voltabsorptometry(CVA) and derivative cyclic voltabsorptometry(DCVA) were used to investigate the electrochemical behavior of BQ in ionic liquids,BMIMBF4and BMIMPF6. The results support that BQ undergoes two successive one-electron reductions,corresponding to the formation of a radical anion intermediate and then the dianion,in ionic liquids,while presenting a different shape of cyclic voltammogram compared to anhydrous acetonitrile solvent.
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