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聚硫堇的电导率为9.6×10-6 S•cm-1,属有机半导体.在10 ℃至60 ℃温度范围内,测定了聚硫堇的循环伏安图、恒电位下的放电曲线和交流阻抗图,并测定了电解质溶液的电导率随温度的变化.在聚硫堇的循环伏安图上有一阳极峰和一阴极峰,它们的峰电流均随温度的升高而增加;恒电位下的放电电流也随温度升高而增加;而交流阻抗的结果表明,聚硫堇的电荷传递电阻Rct随温度升高而下降,即它的交换电流i0随温度升高而增加;而溶液电阻和膜电阻也随温度的升高而下降,这同样会引起电流随温度升高而增加.所以温度对固体半导体聚硫堇的电极反应速率的影响包含了电极反应的本身和电极的电导率等因素的影响.聚硫堇的扫描电镜图证实了它的表面是一种纤维状结构. 相似文献
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The electrolysis of catechol was studied in the pH values of 1 to 10. The results from the rotating ring-disk electrode (RRDE) experiments show that at low pH values,the electrochemical polymerization of catechol was performed by one step,and at higher pH values,the electrochemical polymerization of catechol was carried out by two steps,i.e.oxidation of catechol and followed by polymerization.The intermediates generated at the disk were detected at the ring electrode in the ring potential region of -0.2 to 0 V(vs.Ag/AgCl).One of reasons for the decrease in the ratio of ir to id with increasing the ring potential is caused by formation of positively charged intermediates at the disk electrode.This ratio increases with increasing the rotation rate of the RRDE,which indicates that the intermediates are not stable.A shielding effect during polymerization of catechol was observed when the ring potential was set at 0.1 V (vs.Ag/AgCl).The electron spin resonance(ESR) of polycatechol show that polycatechol possesses unpaired electrons.The images of polycatechol films synthesized at differentconditions are described. 相似文献
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