【作者】 赵斌； 杨英； 黄美华；

【Author】 Bin Zhao;Ying Yang;Meihua Huang;College of Chemistry, Xiangtan University;Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Xiangtan University;

【机构】 湘潭大学化学学院和环境友好化学与应用教育部重点实验室； 高分子材料与应用技术湖南省重点实验室；

【摘要】 DSSCs因其制作简单、成本低廉且具有较高的PCE,在过去二十年一直受到科研人员的青睐[1]。对电极(CE)作为DSSCs的一个重要组成,其主要作用是注入电子时将I3-催化还原成I-[2]。铂对电极虽然性能优异,但由于价格高昂,不利于大面积生产。炭对电极因其对I3-的还原具有较强的催化活性、高电导性、抗碘腐蚀、低价及来源广等优点已成为替代铂对电极的一个热门选择。其中,炭气凝胶(CA)CEs展现出取代铂对电极的极大潜力[1]。通过在有机气凝胶前驱体中引入不同含量的三聚氰胺制备了具有不同孔结构的氮掺杂炭气凝胶(NCAs)。研究结果表明:随着掺氮量的增加,NCAs的平均孔径减小,且中孔含量会随之增加,这将降低NCAs对电极的电荷传输电阻,并增加其电催化活性。由于NCAs的极性,基于聚偏氟乙烯(PVDF)粘结剂的NCA CEs具有远高于基于聚四氟乙烯粘结剂的NCA CEs的电催化活性。经过条件优化后,基于NCA8的DSSC的光电转换效率(PCE)达到8.83%,是同等实验条件下基于铂对电极的DSSC的102.6%。更多还原

【Abstract】 Nitrogen-doped carbon aerogels(NCAs) were prepared by introducing tripolycyanamide during the synthesis of organic aerogel precursors, and the effects of the nitrogen content on the pore structure of NCAs and the photovoltaic properties of dye-sensitized solar cells(DSSCs) based on NCAs counter electrodes(CEs) were studied. With the increase of nitrogen-doped concentration, the pore size of NCAs decreases, and the mesoporous volume fraction increases, which lead to lower charge-transfer resistance and better electrocatalytic activity. The NCA CE based on polyvinylidene fluoride as binder shows a greater electrocatalytic activity than that based on polytetrafluorethylene because its higher polarity leads to better bonding capacity. Under optimized experimental conditions, the DSSC based on NCA8 flexible CE achieved a photoelectric conversion efficiency of 8.83 %, which is 102.6 % of that based on platinum CE(8.61 %) under the same experimental conditions(AM 1.5, 100 mW cm-2).更多还原