Preparation And Performance Research Based On Polyaniline/raphite/carbon Black Composite As Counter Electrode For Dye-sensitized Solar Cells

Dye-sensitized solar cells are developed a new type of solar cell in recent years,his incomparable advantage to other solar cells have attracted much attention. At room temperature,this paper introduced a kind of network structure of conductive polyaniline as catalytic materials,conductive graphite as filler material,carbon black particles adhesion on the dendritic long-chain of conductive polyaniline increase the catalytic activity of the electrode,and by means of screen printing the mixture of the three on the FTO surface,the polyaniline/graphite/carbon omposite counter electrode has been fabricated successfully.The aim of this study is to balance the conductive properties with catalytic activity of the counter electrodes effectively and to resolve the complexity of production process.Scanning electron microscopy(SEM) Results are expressed the reticular formation of conductive polyaniline still exist,adding graphite effectively filled the gap between polyaniline,make each branch chain of polyaniline fully connected to the formation of a good path,to reduce the chances of the electrons are complex,effectively inhibited the generation of dark current,the addition of suitable amount of carbon black adhesive on the polyaniline dendritic long-chain,the catalytic properties of its to provide more and more efficient catalytic activity of the branch point for I3-/I-redox,enhancing catalytic ability of the polyaniline/graphite/carbon composite electrodes through three materials simple mechanical blending.The composite electrode applied to the dye-sensitized solar cells,and the dye-sensitized solar cells were assembled the different of electrode for the photoelectric performance test results show that when polyaniline, graphite, carbon black mass ratio of9:1:0.2the preparation of the composite electrode are assembled into a dye-sensitized solar cell having the highest photoelectric conversion efficiency, reaching8.8%, under the same conditions is127%of conventional platinum electrode. Open circuit voltage and short circuit current density reached0.74V and23.23mA/cm2. Therefore,polyaniline/graphite/carbon composite electrode is an alternative to traditional platinum electrodes on a good choice. In the above basis,with polyaniline,graphite,carbon black quality ratio of9:1:0.2composite electrode assembly into the DSSC specimen,to explore the preparation of polyaniline/carbon black/graphite composite electrode of the most optimal process parameters and methods.The results show that the heat treatment temperature is too high will destroy the internal structure of thin film compound electrode,thereby influence on conductivity and catalytic activity of electrode.Heat treatment time within the appropriate range of less impact on the photoelectric properties of the composite electrodes.Compared with polyvinylpyrrolidone,ethyl cellulose which is more difficult to dissolve,and dissolves performance is not stable,easy to reunite in the pulp,so that the polyaniline is wrapped on the catalytic activity of the electrode material itself and the conductivity, and the destruction of the porous structure of the original electrode material. Preparation of composite electrode screen printing method for film as a whole is relatively uniform,and the thickness of the single and the outstanding performance,it can be mass-produced applications. Integrated these factors,the optimum process parameters and preparation methods of the electrodes are heat treatment temperature of70℃,the heat treatment time30min,polyvinylpyrrolidone as binder,screen printing method to forming thin film.