多壁碳纳米管对电极染料敏化太阳能电池的制备及电化学性能

Preparation and Electrochemical Properties of Dye-Sensitized Solar Cells Based on Counter-Electrodes with Multi-Walled Carbon Nanotubes

以钛酸丁酯为钛源,F:SnO2(FTO)为导电玻璃载体,通过溶胶–凝胶法制备TiO2光阳极;并用3种不同多壁碳纳米管(multi-walled carbon nanotubes,MWCNTs)制备对电极。利用X射线衍射仪和热重–差热分析对TiO2光阳极制备过程中晶体结构和热化学变化进行分析;采用扫描电子显微镜、红外光谱和电化学工作站研究对电极表面形貌、有机基团、催化活性和光敏电池性能。结果表明:在3种不同多壁碳纳米管对电极中,酸处理多壁碳纳米管对电极对I–/I3–氧化还原反应具有很高的催化活性,电池的开路电压、短路电流密度分别达到0.552 V和0.223 mA/cm2,光电转换效率最大为4.10%。另外,其老化速率只有Pt对电极的1/96。

The TiO2 photoanode on F：SnO2（FTO） conductive glass was prepared by a sol–gel method,and the counter-electrodes on the FTO conductive glass was prepared with various multi-walled carbon nanotubes（MWCNTs）.The crystal structure and thermal chemical changes of the TiO2 photoanode were analyzed by X-ray diffraction and thermogravimetric–differential thermal analysis.The morphology,organic groups,catalytic activity of counter-electrodes and performance of photosensitive cell were characterized via scanning electron microscope,infrared spectroscopy and electrochemical workstation.The results show the acid-treated MWCNTs counter-electrode has the superior catalytic performance of I–/I3– redox reaction in three kinds of MWCNTs.The open-circuit voltage and short-circuit current density of dye-sensitized solar cells with the acid-treated MWCNTs as counter-electrode were 0.552 V and 0.223 mA/cm2,respectively,and the maximum conversion efficiency was 4.10%.In addition,the aging rate of the acid-treated MWCNTs counter-electrode only was 1/96 lower than that of Pt counter-electrode