研究目的

Investigating the in situ electrodeposition of nickel cobalt selenides on FTO as an efficient counter electrode for dye-sensitized solar cells.

研究成果

In summary, we have successfully employed the potential reversal electrodeposition technique to fabricate NixCoySe films and NixCoySe-6 array in situ on FTO glass. On one hand, NixCoySe films with different Ni/Co ratio have been designed to control their morphology and electronic structure. Specially, NixCoySe-6 film with the optimized synergistic effect shows numerous particles composed of sheets and nanocrystals, which is beneficial to provide the more catalytic active sites. As a result, NixCoySe-6 CE exhibits the higher electrocatalytic activity for the triiodide reduction than that of Pt and others NixCoySe CEs, resulting in the higher PCE of 7.40% for the corresponding DSC. On the other hand, NixCoySe-6 array CE has also been fabricated to improve the Jsc of DSCs by enhancing the light harvesting efficiency of photoanode. Thus, the DSC based on NixCoySe-6 array CE has yielded a remarkable photovoltaic performance with a PCE of 7.64%, which is 20.9% larger than that of Pt-based device (6.32%). These results are helpful to design and synthesize the ternary selenides with high electrocatalytic activity, which are served as the promising candidates for Pt-free CE materials in DSCs.

研究不足

The technical and application constraints of the experiments, as well as potential areas for optimization.