Ma Jing, Yang Hai-Lian, Ren Wei-Hua
School of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China.
J Nanosci Nanotechnol. 2020 Mar 1;20(3):1749-1755. doi: 10.1166/jnn.2020.17148.
A novel bilayer counter electrodes for Dye-sensitized Solar Cells (DSSCs) made of reduced graphene oxide (RGO) and aligned carbon nanotube (ACNT) was developed. The underlayer ACNT severs as a transition layer for RGO. The overlayer of RGO plays the role of catalytic layer. It was demonstrated that the property of graphene counter electrode was adversely affected by aggregation, by adding surfactant, the aggregation of graphene can be inhabited effectively. Moreover, the interface between the RGO and the ACNT can be optimized by surfactant functionalization of RGO. After screening, a cationic surfactant cetylpyridinium chloride (CPC) functionalized RGO, code as CPC-RGO, exhibits the best performance. Compare to the ACNT based counter electrode and other surfactant functionalized RGO/ACNT based bilayer counter electrodes, the CPC-RGO/ACNT reduced interface resistance and improved the double chemical capacitance efficiently, thus uplifting the short circuit current density and fill factor from 7.35 to 8.8 mA cm, and 59.87 to 62.79, respectively. Eventually, the CPC-RGO/ACNT based DSSC giving a power conversion efficiency of 3.9%, which is 1.24-fold than that of ANCT based DSSC, because of the best splay degree of CPC/RGO.
一种由还原氧化石墨烯（RGO）和定向碳纳米管（ACNT）制成的用于染料敏化太阳能电池（DSSC）的新型双层对电极被开发出来。底层的ACNT作为RGO的过渡层。RGO的上层起催化层的作用。研究表明，石墨烯对电极的性能会受到聚集的不利影响，通过添加表面活性剂，可以有效抑制石墨烯的聚集。此外，通过对RGO进行表面活性剂功能化，可以优化RGO与ACNT之间的界面。经过筛选，一种阳离子表面活性剂十六烷基吡啶氯化物（CPC）功能化的RGO，编码为CPC-RGO，表现出最佳性能。与基于ACNT的对电极和其他表面活性剂功能化的RGO/ACNT双层对电极相比，CPC-RGO/ACNT降低了界面电阻并有效提高了双电层电容，从而将短路电流密度和填充因子分别从7.35提升至8.8 mA cm²，以及从59.87提升至62.79。最终，基于CPC-RGO/ACNT的DSSC的功率转换效率为3.9%，由于CPC/RGO的最佳分散程度，这是基于ACNT的DSSC的1.24倍。
