Preparation And Photovoltaic Properties Of Graphene/SnO₂ Composite Counter Electrode

Dye-sensitized solar cells?DSSC?have the advantages of environmental friendliness,simple structure,relatively high conversion efficiency and design,so it has become our research goal.On this basis,we tested the performance of the detector with the same material and found it to be very excellent performance.In this paper,the graphite oxide?GO?was prepared by the Hummer method,and a series of tests were carried out.The test showed that the GO obtained by the Hummer method was reduced to obtain reduced graphite oxide?RGO?.There is a very obvious layered peeling,and the boundary defects have been greatly improved,indicating that RGO has a high electrochemical catalytic activity,which provides a possibility for its use as a counter electrode.Then different proportions of SnCl₄·5H₂O were mixed with GO by hydrothermal synthesis to obtain different proportions of SnO₂@RGO composites.A total of 7 materials?including Pt and pure SnO₂?were made in this paper.XRD,Raman,scanning and other analyses were carried out on these eight materials,and it was concluded that SnO₂ and reduced graphite oxide?RGO?could be uniformLy mixed to obtain SnO₂@RGO composite.Next,the P25 material?TiO₂?is steamed into a slurry by adding ethyl cellulose and terpineol,and the photo-anode is obtained by screen printing on the FTO conductive glass,plus pre-treatment and annealing.The obtained composite material was also prepared into a slurry by a rotary steaming method,and then brushed on the FTO conductive glass by screen printing,and then annealed to obtain a counter electrode.Using a hot press,sealing film,the optical instrument such as vacuum pump anode and the counter electrode assembly into the electrolyte plus dye-sensitized solar cell device and a photodetector.After eight sets of materials with different proportions were made into counter electrodes and assembled with dye-sensitized solar cells with TiO₂ photoanodes,the dye-sensitized solar cells were subjected to iv test,and the performance parameters such as conversion efficiency and fill factor were analyzed to evaluate battery performance.Firstly,the conversion efficiency of the battery with SnO₂ as the counter electrode and the SnO₂@RGO composite material as the counter electrode is compared.From the test results,it can be seen that the conversion efficiency of the pure SnO₂ as the counter electrode is only 1.75%,and the addition of RGO is made into SnO₂.After the@RGO composite counter electrode,the battery conversion efficiency is increased to at least3.08%,and the conversion efficiency of the No.6 battery can be as high as 5.08%.As an alternative material for the platinum?Pt?electrode,the conversion efficiency of the Pt-electrode cell is 6.61%,and the SnO₂@RGO can reach 86%of the conversion efficiency of the Pt electrode.Then,the battery conversion efficiency of the material No.1-6 was compared horizontally as the counter electrode,and the highest conversion efficiency was obtained at the No.6 sample.Similarly,the photoanode and the counter electrode of the same material were fabricated into photodetectors,which were tested by iv,it,vt and eis.By comparing the test performance,it was found that the SnO₂@RGO composite material was in the current density,the rise and fall time or the switch.The ratio and performance in terms of stability and impedance are superior to those of the SnO₂ and Pt counter electrodes.The good performance is due to the synergistic effect of SnO₂ and RGO.The doping of SnO₂ particles makes the layered RGO layers filled with SnO₂ particles to form a three-dimensional structure.More boundary defects are exposed,which makes the electrodes show excellent Cutting activity and improves the performance of photovoltaic devices.