CAJ | 학술논문

采用循环伏安法( CV)和现场光谱电化学方法从分子水平上研究了对苯醌( BQ)在4种离子液体中铂电极上的电化学氧化还原过程.基于在298.15~343.15 K温度范围内对苯醌的伏安曲线，获得了不同温度下对苯醌的扩散系数(D)，进而求得其扩散活化能(Ea).利用现场红外光谱电化学循环伏吸及导数循环伏吸法同时跟踪电化学过程中反应物、中间体及产物随时间(电位)的变化.光谱电化学结果表明，苯醌在1-丁基-3-甲基咪唑四氟硼酸盐( BMIMBF4)和1-丁基-3-甲基咪唑六氟磷酸盐( BMIMPF6)中与在乙腈中类似，先生成苯醌阴离子自由基，随后进一步还原为二价阴离子.
채용순배복안법( CV)화현장광보전화학방법종분자수평상연구료대분곤( BQ)재4충리자액체중박전겁상적전화학양화환원과정.기우재298.15~343.15 K온도범위내대분곤적복안곡선，획득료불동온도하대분곤적확산계수(D)，진이구득기확산활화능(Ea).이용현장홍외광보전화학순배복흡급도수순배복흡법동시근종전화학과정중반응물、중간체급산물수시간(전위)적변화.광보전화학결과표명，분곤재1-정기-3-갑기미서사불붕산염( BMIMBF4)화1-정기-3-갑기미서륙불린산염( BMIMPF6)중여재을정중유사，선생성분곤음리자자유기，수후진일보환원위이개음리자.
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 ob-served in cyclic voltammogram, showing a quasi reversible diffusion process of BQ with the two-step electro-chemical 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 voltabsorptome-try( CVA ) and derivative cyclic voltabsorptometry ( DCVA ) were used to investigate the electrochemical behavior of BQ in ionic liquids, BMIMBF4 and BMIMPF6 . The results support that BQ undergoes two succes-sive 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.