| 초록 |
An organized mesoporous SnO2 (OM-SnO2) film were prepared using graft copolymer PVC-g-POEM as a sacrificial template for depositing CoS nanoparticles. This Pt-free counter electrode shows high energy conversion efficiencis of 6.6 % using solid-solite electrolyte, 7.5 % using liquid-state electolyte which are the highest values reported for Pt-free dye-sensitized solar cells. These results correspond to improvements about 14 %, 9 % compared to a conventional Pt counter electrode prepared with chloroplatinic acid hexahydrate (H2PtCl6). In this experiment, the OM-SnO2 film plays key component for ability to deposit a large amount of CoS nanoparticles which acts as electrocatalysts via facile solvothermal reaction. The OM-SnO2 film with a high porosity, larger pores, and good interconnectivity can be prepared using a poly(vinyl chloride)-g-poly(oxyethylene methacrylate) (PVC-g-POEM) graft copolymer as template, which has enhanced electron transport property with good interaction sites for the formation of CoS nanoparticles. |
