Department of Opto-electric Information Materials and Quantum Devices, School of Materials Science and Engineering, Harbin Institute of Technology, 150001 Harbin, China.
Nanoscale. 2014 May 21;6(10):5410-5. doi: 10.1039/c3nr06340b.
Three-dimensional Ag nanoparticle/GNs (Ag/GNs) hybrids as highly efficient counter electrode (CE) materials for dye sensitized solar cells (DSSCs) is described, highlighting the Ag nanoparticles as zero-dimensional nanospacers inserting into GNs to lift the interspacing layer between individual GNs. It is demonstrated that, when the hybrids are used as CE materials for DSSCs, compared to their pure GNs, Ag/GNs hybrids without agglomerates have a significant improvement in their electrochemical properties such as high current density, narrow peak-to-peak separation (Epp) and low charge transfer resistance (RCT). The enhancement of electrochemical performance can be attributed to the increased electrode conductivity, an extended interlayer distance and the reduction of the restacking of graphene sheets due to the insertion of metallic Ag nanoparticles into GNs. The DSSC with this hybrid CE exhibited an energy conversion efficiency (η) of 7.72% with an open circuit voltage (VOC), short circuit photocurrent density (JSC), and fill factor (FF) of 732 mV, 14.67 mA cm(-2), and 71.8%, respectively.
三维 Ag 纳米颗粒/石墨烯（Ag/GNs）杂化材料作为高效染料敏化太阳能电池（DSSC）的对电极（CE）材料，Ag 纳米颗粒作为零维纳米间隔物插入 GNs 以提高单个 GNs 之间的间隔层。结果表明，当将杂化材料用作 DSSC 的 CE 材料时，与纯 GNs 相比，无团聚的 Ag/GNs 杂化材料在电化学性能方面有显著提高，如高电流密度、窄峰峰值分离（Epp）和低电荷转移电阻（RCT）。电化学性能的提高归因于电极导电性的提高、层间距离的延长以及由于金属 Ag 纳米颗粒插入 GNs 而减少石墨烯片的堆叠。采用该杂化 CE 的 DSSC 的能量转换效率（η）为 7.72%，开路电压（VOC）、短路光电流密度（JSC）和填充因子（FF）分别为 732 mV、14.67 mA cm(-2)和 71.8%。
