铝颗粒弥散分布纳米孔碳基复合材料对电极染料敏化太阳能电池的光电性能

Photoelectric Properties of Dye-Sensitized Solar Cells Containing Nanoporous Carbon Composite Counter Electrode with Diffusely-distributed Al Particles

制备了一种新型铝颗粒弥散分布的纳米孔碳基复合材料,并以此作为对电极的催化层,研究了催化层厚度对该对电极染料敏化太阳能电池(DSC)光电性能的影响以及铝颗粒的作用机制。结果表明:随催化层厚度的增大,纳米孔碳基复合材料对电极DSC的转换效率先增后减,在催化层厚度为44μm时达到最大,为5.15%,比纯碳对电极DSC的增加21.5%;细小铝颗粒弥散分布于复合材料对电极中,起连接碳颗粒的桥梁作用,能够加快外电路电子传输,从而加速电解质还原,使催化层增厚提高催化活性的作用得以充分发挥,并抵消催化层增厚导致的方块电阻的升高效应,最终提升了DSC的转换效率。

A novel carbon based composite counter electrode with diffusely-distributed aluminum particles was fabricated as base catalytic film of counter electrode,and the influence of the catalytic film thickness on photoelectric properties of the assembled dye-sensitized solar cells(DSC)and the function mechanism of the aluminum particles were investigated.The results show that the conversion efficiency of the assembled DSC increased firstly and then decreased with the catalytic film thickness increasing.When the thickness of catalytic film was 44 μm,the conversion efficiency reached a peak of 5.15%,the efficiency was improved by 21.5% compared to that of the optimum pure carbon counter electrode based DSC.The small size aluminum particles diffusely distributed in the composite counter electrode and acted as bridge between carbon particles,which could accelerate the electron transport of the external circuit and electrolyte reduction.As a result,thicker catalytic film possesses enhanced catalytic activity and thus counteracted the effect of the increasing resistance due to the thickening of the catalytic film.Accordingly,the conversion efficiency of DSC increased.