Size effect of POMs promoting electron transfer to improve the performance of dye-sensitized solar cell  

多金属氧酸盐尺寸效应促进电子转移以提高染料敏化太阳能电池的性能

作　　者：LI Xiaohong ZHANG Yuteng YU Haihui TIAN Xiaoli ZHANG Haifeng CHEN Weilin 李晓红;张誉腾;于海辉;田晓丽;张海丰;陈维林(东北电力大学化学工程学院,吉林吉林132012;东北师范大学多酸与网格材料化学教育部重点实验室,吉林长春130024;吉林师范大学博达学院,吉林四平136000)

机构地区：[1]School of Chemical Engineering,Northeast Electric Power University,Jilin 132012,China [2]Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education,Northeast Normal University,Changchun 130024,China [3]Boda College of Jilin Normal University,Siping 136000,China

出　　处：《分子科学学报》2024年第5期441-447,共7页Journal of Molecular Science

基　　金：supported by the National Natural Science Foundation of China(52070035,22271042,21871041,and 22401039);Jilin Province Scientific and Technological Planning Project of China(20200403001SF);Science and Technology Research Project of the Education Department of Jilin Province(JJKH20211286KJ);the Natural Science Foundation of Jilin Province(20180101298JC);Fundamental Research Funds for the Central Universities(2412022ZD009);Start-up Fund for Doctoral Research of Northeast Electric Power University(BSJXM-2024112)

摘　　要：In recent years,dye-sensitized solar cells(DSSCs)have attracted much attention due to their ability to efficiently convert light energy into electricity.The enhancement of electron transfer efficiency and the suppression of interfacial charge recombination are essential for the development of DSSCs.Polyoxometalates(POMs)have already been confirmed to act as effective electron-transfer mediators for accepting and delivering electrons remaining the integrated structure.Due to size effect,nano-sized POMs with more active sites,exposed more surface area,and changed electronic structure enhance the inherent activity.Further,the nano-sized POMs aiming on titanium dioxide(TiO_(2))shortens the electron transport distance,accelerate the electron transfer,and effectively suppresses the electron-hole recombination,thus improving the electron utilization and enhancing the power conversion efficiency(PCE)of the DSSCs.Taking PMo_(12) as an example,we prepared PMo_(12) to a nanometer size of about 50 nm by freeze-drying technology and further combined with TiO_(2)as photoanodes.To our satisfying surprise,a significant improvement of PCE in DSSCs is obtained as high as 8.12%,which is 22.3%and 47.3%higher than the original PMo_(12)/TiO_(2)composite material and TiO_(2)alone,respectively.近年来,染料敏化太阳能电池(DSSCs)能够高效地将光能转化为电能而备受关注。提高电子转移效率,抑制界面电荷重组对DSSCs的发展至关重要。多金属氧酸盐(POMs)作为有效的电子传递媒介,能够接受和传递电子保持结构不变。由于尺寸效应,纳米尺寸的POMs由于具有更多的活性位点、暴露更丰富的表面积和变化的电子结构,从而提高固有活性。此外,纳米尺寸的POMs锚定在二氧化钛(TiO_(2))上可缩短电子传输距离,加速电子转移,并有效抑制电子-空穴复合,进一步提高电子利用率,改善DSSCs的光电转换效率(PCE)。以PMo_(12)为例,通过冷冻干燥技术将PMo_(12)制备成约50 nm的颗粒,进一步与TiO_(2)结合作为光阳极。研究结果显示,DSSCs的PCE显著提高,高达8.12%,分别比原始的POM_(12)/TiO_(2)复合材料和单独的TiO_(2)高出22.3%和47.3%。

关 键 词：POLYOXOMETALATES dye-sensitized solar cells size effect 

分 类 号：TM914.4[电气工程—电力电子与电力传动]