The electrocatalytic composite materials of honeycomb structure NiS₂ nanosheets loaded with metallic CoS₂ nanoparticles are in situ prepared on F doped SnO₂ conductive glass (FTO) substrates used as counter electrodes of DSSCs through chemical bath deposition (CBD) and sulfidizing process. Single crystalline NiS₂ honeycomb structure array lay a foundation for the large surface area of NiS₂/CoS₂ composite CEs. The formed NiS₂/CoS₂ nanointerface modulates electronic structure of composite CEs from the synergetic interactions between CoS₂ nanoparticles and NiS₂ nanosheets, which dramatically improves the electrocatalytic activity of NiS₂/CoS₂ composite CEs; Metallic CoS₂ nanoparticles covering NiS₂ nanosheets electrodes adjusts the electrodes' structure and then reduces the series resistance (Rs) and the Nernst diffusion resistance (Zw) of counter electrodes. The improvement of these areas greatly enhances the electrocatalytic performance of CEs and the short circuit current density (Jsc) and Fill factor (FF) of DSSCs. Impressively, the DSSC based on NiS₂/CoS₂-0.1 CE shows the best photovoltaic performance with photovoltaic conversion efficiency of 8.22%, which is 24.36% higher than that (6.61%) of the DSSC with Pt CE. And the NiS₂/CoS₂-0.1 CE also displays a good stability in the iodine based electrolyte. This work indicates that rational construction of composite electrocatalytic materials paves an avenue for high-performance counter electrodes of DSSCs.

通过化学浴沉积（CBD）和硫化工艺，在用作DSSCs反电极的F掺杂SnO ₂导电玻璃（FTO）基底上原位制备了载有金属CoS ₂纳米颗粒的蜂窝结构NiS ₂纳米片的电催化复合材料。单晶NiS ₂蜂窝结构阵列为NiS ₂ / CoS ₂复合CE的大表面积奠定了基础。所形成的NiS ₂ / COS ₂ nanointerface调制电子复合的CE从服务等级之间的协同相互作用结构₂纳米颗粒和NIS ₂纳米片，极大地提高了NiS ₂ / CoS ₂复合CE的电催化活性；覆盖NiS ₂纳米片电极的金属CoS ₂纳米粒子可调节电极的结构，然后减小反电极的串联电阻（Rs）和能斯特扩散电阻（Zw）。这些区域的改进极大地增强了CE的电催化性能以及DSSC的短路电流密度（Jsc）和填充因子（FF）。令人印象深刻的是，基于NiS ₂ / CoS ₂ -0.1 CE的DSSC表现出最佳的光伏性能，光伏转换效率为8.22％，比具有Pt CE的DSSC高（6.61％）24.36％。还有NiS₂ / CoS ₂ -0.1 CE在基于碘的电解质中也显示出良好的稳定性。这项工作表明复合电催化材料的合理构造为DSSC的高性能对电极铺平了道路。