Solar cells of the third generation aim to reduce costs and/or boost the efficiency of current solar cells. The goal of this paper is to systematically research a cobalt nickel sulfide/reduced graphene oxide (CoNi₂S₄/rGO) nanocomposite sandwich type dye sensitized solar cell (DSSC) prototype as a counter electrode synthesized by a simple one-step hydrothermal process. The structural and morphological characterization of the nanocomposite reveals that cubic structure with spherical shaped nanoparticles (25–30 nm), which is uniformly decorated on the rGO sheets. When used as a counter electrode, the optimized CoNi₂S₄/rGO nanohybrid film delivers a high photo-conversion efficiency of 10.21%, which is higher than that the DSSC manufactured as counter electrode with Pt (6.45%) and even better than that with pristine CoNi₂S₄ (3.45%). Cyclic voltammetry, Tafel plot and electrochemical impedance spectroscopy show that the as-synthesized CoNi₂S₄/rGO nanohybrid counter electrode exhibits an excellent electrocatalytic property than compared with pure CoNi₂S₄ counter electrode (CE). This research also offers some clues to the potential growth and rational design of CoNi₂S₄/rGO nanohybrid counter electrode for advance energy applications.

第三代太阳能电池旨在降低成本和/或提高当前太阳能电池的效率。本文的目的是系统地研究硫化钴镍/还原氧化石墨烯（CoNi ₂ S ₄ / rGO）纳米复合夹心型染料敏化太阳能电池（DSSC）原型，作为通过简单一步水热法合成的对电极。纳米复合材料的结构和形态特征表明，具有球形纳米颗粒（25–30 nm）的立方结构在rGO板上均匀装饰。当用作对电极时，优化的CoNi ₂ S ₄/ rGO纳米杂化膜可提供10.21％的高光转换效率，高于用Pt制造的对电极DSSC（6.45％），甚至比使用原始CoNi ₂ S ₄（3.45％）更好。循环伏安法，Tafel图和电化学阻抗谱表明，与纯CoNi ₂ S _4对电极（CE）相比，合成后的CoNi ₂ S ₄ / rGO纳米杂化对电极表现出优异的电催化性能。这项研究还为潜在的增长和CoNi ₂ S ₄ / rGO纳米杂化反电极在先进能源应用中的合理设计提供了一些线索。