Electrochemical Redox of Benzoquinone in Ionic Liquids
Electrochemical Redox of Benzoquinone in Ionic Liquids
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离子液体中苯醌的电化学氧化还原
DOI：
10.7503/cjcu20130724
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发表时间：
2014-04
期刊：
影响因子：
--
通讯作者：
Jin Baokang
中科院分区：
文献类型：
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作者：
Li Tong;Jin Baokang
采用循环伏安法（CV）研究了不同离子液体对铂电极上1,4-苯醌（BQ）的还原作用。在较宽的扫描速率范围内，循环伏安图上清晰地观察到两对氧化还原峰，显示了BQ的准可逆扩散过程和两步电化学还原过程。循环伏安图得到了扩散系数和活化能，从298℃开始，扩散系数随温度升高而增大。15 K到343。15 K。采用循环伏安法（FTIR）、原位FTIR光谱电化学（FTIR）、循环伏安法（CVA）和衍生循环伏安法（DCVA）研究了BQ在离子液体bmimbf4和BMIMPF6中的电化学行为。结果支持BQ在离子液体中经历了两次连续的单电子还原，对应于自由基阴离子中间体的形成，然后是阴离子，同时与无水乙腈溶剂相比，呈现出不同形状的循环伏安图。
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.