Synthesis Of Carbide And Nitride And Their Application In Dye-sensitized Solar Cells

Counter electrode(CE) is an important part of the dye-sensitized solar cells(DSCs), The noble metal platinum(Pt) is widely used as a CE catalyst for DSCs because of its high catalytic activity. However, the high price and limited reserves of Pt restrict its mass application in DSCs. Therefore, developing ideal Pt-free catalysts has become an increasingly popular research topic. The text has synthesized nitride and carbide and introduced into the DSCs as CE catalytic materials. Meanwhile, the effects of morphologies on the catalytic activity were also investigated by the cyclic voltammetry(CV)、tafel-polarization、electrochemical impendence spectroscopy(EIS).First, I prepared Niobium nitride and Chromium carbide. Vanadium nitride with different morphologies have been synthesized by the way of controlling the start materials quantity and Molybdenum carbide with different morphologies were synthesized by three different kinds of methods. The relationship of the variety and microstructrue of the catalytic materials of the catalytic activity has been systematically evaluated. Then,the catalytic mechanisms of the catalatic materials for the regeneration of the conventional redox couples(I-/I3-) and the new organic redox couple(T-/T2) and Co3+/Co2+ redox couple were investigated by some technology. Some of the Pt-free catalytic materials(VN-peas、VN-S、VN-L、Mo2C-Nt) behave better than Pt in T-/T2 and Co3+/Co2+ system demonstrating that Pt-free catalytic materials are suitable for both T-/T2 and Co3+/Co2+ electrolyte.In conclusion,a series of low cost Pt-free catalytic materials with high efficiency were designed and synthesized for the DSCs. As a result, we were able to greatly expand the range of CE catalytic materisls. By contributing to the reduction of the cost of production for this device, this research improves the competitiveness of this solar cells.