Zhao Jing, Ma Jing, Nan Xi, Tang Bin
J Nanosci Nanotechnol. 2017 Jan;17(1):788-95. doi: 10.1166/jnn.2017.12407.
Multi-walled carbon nanotubes (MWCNTs) with different morphologies were introduced into dyesensitized solar cell (DSSC) as low-cost substitutes for Pt counter electrode (CE). The effect of length and orientation of MWCNTs on the power conversion efficiency (PCE) of DSSC with MWCNTs CE were studied by measuring electrochemical impedance spectroscopy of MWCNTs and the photocurrent density–voltage (J–V ) characteristics of DSSC in this study. Results revealed that the long MWCNTs showed better electrocatalytic activity of reducing triiodide ions than short MWCNTs and yielded the power conversion efficiency of 2.42%. When the aligned multi-walled carbon nanotubes (AMWCNTs) with the same length as the long MWCNTs were used to prepare the CE, the power conversion efficiency of the DSSC reaches 2.95%. In order to further improve the performance of the DSSC, the processing of photoanode and counter electrode were adjusted. The power conversion efficiency of the cell with AMWCNTs as CE prepared by adjusted processing achieved 3.95% and the short circuit current density is superior to the DSSC with Pt as CEs, and it indicated the adjusted processing is beneficial to increase the overall performance of the dye-sensitized solar cell.
将具有不同形态的多壁碳纳米管（MWCNTs）作为铂对电极（CE）的低成本替代品引入染料敏化太阳能电池（DSSC）中。本研究通过测量MWCNTs的电化学阻抗谱以及DSSC的光电流密度-电压（J-V）特性，研究了MWCNTs的长度和取向对含MWCNTs对电极的DSSC功率转换效率（PCE）的影响。结果表明，长MWCNTs在还原三碘离子方面表现出比短MWCNTs更好的电催化活性，功率转换效率为2.42%。当使用与长MWCNTs长度相同的取向排列的多壁碳纳米管（AMWCNTs）制备对电极时，DSSC的功率转换效率达到2.95%。为了进一步提高DSSC的性能，对光阳极和对电极的制备工艺进行了调整。采用调整后的工艺制备的以AMWCNTs为对电极的电池功率转换效率达到3.95%，短路电流密度优于以铂为对电极的DSSC，这表明调整后的工艺有利于提高染料敏化太阳能电池的整体性能。
