Investigation On The Synthesis And Application Performance Of Counter Electrode Materials In Dye Sensitized Solar Cell

Dye sensitized solar cell （DSSC） reprents a type of inexpensive and green photovoltaic devices. InDSSC, counter electrode plays important roles in catalyzing the redox of I-3/I-couple in electrolyte andtransferring of electrons. The commonly employed platinum （Pt） based counter electrode suffers from highcost, Exploration of counter electrode materials with low Pt or non-Pt is of significant scientific mean.In this thesis, we systematically investigated the synthesis of a series of counter electrode materialsincluding Pt-Graphene composite, polyaniline （PANI）, polypyrrole-graphene （ppy-graphene） compositeand the effect of them on the performance of DSSC. The main content are shown as follows:（1） Pt-graphene composite was synthesized via simultaneous co-reduction ofpoly（diallyldimethylammonium chloride） functionalized graphene oxide and chloroplatinic acid by sodiumborohydride. The composite demonstrated high catalytic activity on the redox of I-3/I-couple in electrolyteand excellent conductivity. The composite with Pt content of60%offered overall photovoltaic efficiencyof6.08%, which is apparently higher than that with mere Pt counter electrode （5.71%）.（2） Net-shaped PANI counter electrodes was fabricated by in situ polymerization on the surface ofconductive glass, the afforded transparent PANI counter electrode can be used in double side active DSSC.When the incident light was illuminated from both photoanode and counter electrode, the cell offeredphotovoltaic efficiency of6.24%and4.06%, the former is higher than that based on platinized counterelectrodes （6.03%）.（3） Ppy-graphene composite was synthesized using Fe₂O₃clusters as template, the composite counterelectrode exhibited high catalytic activity on the redox of I₃-/I-couple, the composite can effectively reducethe charge transfer resistance at counter electrode/electrolyte interface. The DSSC using this compositeoffered a photovoltaic efficiency of4.35%, which achieved85%of the efficiency in DSSC based onplatinized counter electrode.（4） G-Sb₂S₃composites were synthesized via a facile solvothermal method. The Sb₂S₃nanoparticleswere homogeneously scattered onto the graphene sheet, and the interaction between Sb₂S₃and graphenecould effectively separate the photo-induced charge. Graphene content in the composite showed great influence on the photocatalytic activity, G-Sb₂S₃0.1exhibited the optimal photocatalytic activity andstability.（5） Sb₂S₃dendrites composed of1-dimentional rods were prepared by a facile hydrothermal method.The determining factors on morphology of Sb₂S₃and the formation mechanism was investigated. Thesensor constructed by the as-prepared product was employed for dopamine detection, which exhibited widelinear detection range, low detection limit and strong anti-interference ability against ascrobic acid.