The Study On Anode And Counter Electrode Of Dye-sensitized Solar Cells

Dye-sensitized solar cells（DSSC） consists of a dye-adsorbed nanoporous layer onfluorine-doped tin oxide （FTO） glass as a working electrode, a Pt thin film counter electrodeand an electrolyte normally containing I-/I3-redox couple. The nanoporous TiO₂layerprovides high surface area for dye loading. However, it also provides abundant TiO₂surfacesites and bare ITO conducting sites, where the photoinjected electrons may recombine withI3-. Platinized counter electrode has low resistance and high electrocatalytic activity for iodide（I-）/triiodide （I3-） redox couple in DSSCs. But platinum is one of the costly precious metals.In order to enhance solubility, TiO₂compact layer and a Pt/graphite counter electrode forDSSC was introduced and the properties of the anode and counterelectrode, and the effect onthe performance of DSSC were investigated.1. Dip-coating the TiO₂organic sol and powder coating method ware used to produce acompact TiO₂film,porous TiO₂film and double-layered TiO₂composite films on the FTOsurface. Thoes films were characterized by scanning electron microscopy （SEM）, XRD（X-raydiffraction）, the UV-visible spectroscopy and CV（cyclic votammetry）, researched theinfluence of different dip times of TiO₂organic sol to DSSC.2. The different content of Pt/graphite counter electrode were prepared by reducingH2PtCl6with ethylene glycol in graphite and characterized the performance by XRD, SEM.3. By using the anode films, counter electrods, dyes which is prepared in our team’sbefore work, DSSC were constructed,and their Photoelectro-chemieal Properties wereinvestigated. It is found that, Pt3/C electrode of battery shows the same and Pt5/C electrodeachieve the highest energy conversion efficiency and lower cost compared with Pt electrode,which make it available in DSSC practical applications. More electrons can be collected at the conduction band of the The compact film, and reduce the photo-electron recombinationspeed effectively to improve the voltage of open circuit. The solar energy conversion of thethree kinds of dyes improved was169%,174%and148%higher than before, respectively.