硫脲修饰CNTs用于QDSSCs电池对电极的研究

Electrochemical Performances of Thiourea Modified CNTs used as Counter Electrode of QDSSCs

对电极是量子点敏化太阳能电池(QDSSCs)的重要组成部分,起到收集外电路电子和催化还原电解液的作用。本文采用水热法制备硫脲修饰的碳纳米管(CNTs)作为对电极材料,通过XRD和SEM分析了修饰前后CNTs的物相和形貌,利用EIS和CV等电化学手段,结合QDSSCs电池光电转化特性对对电极的特性,进行了研究。结果表明:硫脲修饰有效降低了CNTs对电极的电荷转移阻抗,提高了催化活性;当CNTs与硫脲质量比为1︰0.1时,电池光电转化效率相比纯CNTs电极提高了31%。

As an important component of quantum dots-sensitized solar cells（QDSSCs）, counter electrode（CE） makes a decisive influence on collecting electrons from external circuit and catalyzing the reduction of polysulfide electrolyte. In this work, a series of carbon nanotubes（CNTs） with different thiourea modified were synthesized by hydrothermal method. XRD and SEM were used to discuss the feature and the nanostructure of S/CNTs. And the EIS and CV measurements demonstrate the electrochemical performances of CEs. The results indicate that the S/CNTs CEs with low charge transfer resistance and high electrocatalytic activity are better than the pure CNTs CE. And the conversion efficiency was improved 31 % by the sample with mass ratio of 1︰0.1 compared with pure CNTs CE.