[BMIM]BF_4中马来酸在Pt上的电化学还原和原位红外光谱

Electrochemical and in situ FTIRS of maleic acid reduction in[BMIM]BF_4 on Pt electrode

采用循环伏安法(CV)、计时电量法(CA)和电化学原位红外反射光谱(in situ FTIRS),从分子水平上研究了离子液体[BMIM]BF_4中马来酸在Pt电极上的电化学还原过程。结果表明,[BMIM]BF_4中马来酸在Pt电极上的还原是受扩散控制的准可逆过程,测得扩散系数为1.0×10^(-7)cm^2·s^(-1);in situ FTIRS研究发现, [BMIM]BF_4中马来酸在Pt电极上的还原发生在其中的一个羧基位上,即马来酸首先获得一个电子生成阴离子自由基,随后再获得一个电子生成二价阴离子。

Electrochemical reduction of maleic acid in the ionic liquid was studied by cyclic voltammetry (CV),chronoamperometry(CA)and in situ FTIR spectroscopy.The results demonstrated that the reduction of maleic acid on Pt electrode is a quasireversible process controlled by diffusion.The diffusion coefficient of maleic acid is determined to be 1.0×10^(-7)cm^2·s^(-1).In situ FTIRS results illustrated that the reduction of maleic acid in ionic liquids occurs on the carboxyl.The first step is to generate radical anions, which are reduced to aldehyde species.