聚3-甲氧基噻吩对二巯基噻二唑的电化学改性的研究

研究了聚3-甲氧基噻吩(PMOT)膜电极在2,5-二巯基-1,3,4-噻二唑(DMcT)溶液中电化学处理或浸泡后的循环伏安(CV)曲线的变化规律,并研究了一定量的PMOT对DMcT充放电性能的影响。实验结果表明,PMOT膜电极在DMcT溶液中进行电化学处理或浸泡过程可使DMcT进入PMOT膜内部与PMOT形成复合物。PMOT对DMcT的电化学催化作用可能和二者之间形成的电子给体-受体复合物有关.该复合物的电化学氧化还原特性不同于PMOT和DMcT,其氧化还原反应速率和可逆性均优于DMcT,且经过PMOT催化改性后,DMcT的放电容量得到了增加,循环性能有了很大改善。

Study on the Electrochemical Performance of Improvement 2,5-Dimercapto-1,3,4-Thiadiazole (DMcT) by Poly(3-Methoxythiophene) (PMOT)

Electrochemical polymerized Poly(3-Methoxythiophene)(PMOT) film electrode was used to investigate the electro-catalytic effect of PMOT on the electrochemical redox reaction of 2,5-dimercapto-1,3,4-thiadiazole(DMcT). PMOT film electrode was electrochemically treated before it was scanned in 0.5mol/L DMcT 0.1mol LiClO_4/ 1L AN electrolyte. The cyclic voltammograms of PMOT film electrode in 0.5mol/L DMcT 0.1mol LiClO_4 / 1L AN solution changed with the above treatment, implying the electrocatalytic effect of PMOT on the redox reaction of DMcT. The formation of electron-donor-accept or adducts through the interaction between thiolordisulfide groups of DMcT and MOT groups of PMOT during the treatment was probably the reason of the catalysis. The electrochemical properties of the adduct were different from those of DMcT. The adduct possessed a higher discharge capacity and a better electrochemical reversibility than the case DMcT used alone.