Study on the electrochemical performance of improvement 2, 5-dimercapto-l, 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-l, 3, 4-thiadiazole (DMcT). PMOT film electrode was electrochemically treated before it was scanned in 0.5 mol/L DMcT 0.1 mol LiC1O4/l L AN electrolyte. The cyclic voltammograms of PMOT film electrode in 0.5 mol/L DMcT 0.1 mol LiC1O4/1 L 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.