Study On The Cathodes Materials Of Dey-sensitized Solar Cells

The cathode materials is one of the vital factors for dye-sensitized solar cell(DSSCs) performance, owing to playing a significant role of catalytic reductionelectrolyte and collection carriers. Several transition metal sulfides cathodes withbrilliant catyalytic activity were reported, and we speculated that P-type FeS2may actas fabulous cathodes for dye-sensitized solar cells. In this thesis, FeS2NRs arraycathode structures with excellent catalytic activity and various morphology CuxSnanostructures were designed and obtained. Moreover, the catalytic mechanism of thecathode materials were explored subsequently. The main results and achievements areas follows.1. The multiple FeOOH nanorod arrays were synthesised through simplehydrothermal method on various substrates, such as conductive glass (FTO), PorousSilica (PS) and Carbon Fiber. And FeOOH nanoflowers on Porous Silica (PS) wassynthesized. At the same time, the FeOOH nanorods’ growth mechanism wasdeveloped through discussing the concentration of oxygen and Fe3+ion in the system.2. The P-type FeS2nanorod arrays and FeS2thin films on FTO substrate wereobtained through sulfurizing FeOOH nanorod arrays and Fe thin films, respectively.Then, they were applied as the counter electrodes (CEs) of dye-sensitized solar cells(DSSCs) in iodine electrolyte system, and FeS2nanorod arrays performing moreexcellent catalytic activity than Pt electrode. We found that the key factors, whichinfluence the cathode’ properties, are different catalytic sites, the connect withelectrolyte and charge transport channels.3. CuxS flake nanostructures with viarious morphology were obtained byconventional immersion method, such as nanosheets, nanowalls and nanoflowers. Onthe other hand, we synthesized various other morphology CuxS nanostructuresthrough ion exchange methode, such as inverse oprals structure and nanorod arrays.What’s more, the catalytic mechanism of CuxS electrode in S/S electrolyte wasexplored subsequently.