Study On The Hierarchically Pore Electrode Materials For Dye Sensitized Solar Cells

In face of the global energy crisis and ecological crisis,it is very important to developeconomic feasible new energy resources for the global sustainable society.As an inexhaustible,renewable and clean energy,solar energy has attracted wide attention of the society.And as a new generation of solar cell,dye sensitized solar cells?DSSCs?has many advantages,such as low cost,light weight,etc.,but the efficiency is very low.Our studies mainly focus on improving the conversion efficiency of the dye-sensitized solar cells to meet the demand of industrialization,which is also the means of solving the energy crisis and environmental problems.Electrode is the main component of the dye sensitized solar cell,and plays a key role in improving the conversion efficiency of the cells.The effective way to improve the performance of electrode is increasing the surface area.Hierarchically pore structure,including macroporous and mesoporousstructure,can not only provide effective proton transport channels for materials,but also increase the specific surface area.Therefore,the hierarchically porous structure is introduced to the TiO₂ photoanode and Fe-N-C counter electrode materials by self-assembly method with surfactant as oriented agent in this paper.Then we studied the performance of DSSCs assembled with hierarchically porous electrode material.The main conclusions are as follows:?1?3D Ordered Macro-/Mesoporous?3DOM/m?TiO₂ anode materials with high specific surface area and high efficiency have been prepared through two steps of self-assembly processes.The firstself-assembly process is the H-bond self-assembly ofthe precursor and F127 surfactants to form mesoporous.PMMA microspheres were used toas the macroporous template.The materials with hierarchically porous structure can beprepared after removing the template.The second self-assembly process is the self-assembly ofthe material ontology and N719 dye,forming anode materials with intensive dye adsorption and high performance.Characterization indicated that TiO₂ was anatase and proved the successful synthesis of the hierarchically porous structure,which can greatly enhance the ability ofultraviolet visible light absorption so as to improve the photovoltaic performance of the materials.The final performance testing of DSSCs assembled with3DOM/m TiO₂anode indicated that the introduction of hierarchically pore structure can greatly improve the photoelectric conversion efficiency of the battery to maximum,which can reach to 9.20%,compared with other structures.?2?Fe-N-3DOM/mC counter electrode materialswith high specific surface area and high efficiency have been prepared through two steps of self-assembly processes.The first self-assembly processis the H-bond self-assembly ofthe precursor and F127 surfactants to form mesoporous template.The second self-assembly process is the?-?self-assembly ofthe resol and Fe?TPTZ?_2.1,which can embed active site.SiO₂nanospheres were used toas the macroporous template.The counter electrode materials with hierarchically porous structure can beprepared after removing the template.Characterization also proved the successful synthesis of hierarchically porous structurewith high surface area.We analyzed the crystalline state of the materials,the composition of surface elements,and the N-containing active site.The final performance test of DSSCs assembled withFe-N-3DOM/mC counter electrode indicated that the introduction of hierarchically pore structure can greatly improve the photoelectric conversion efficiency of the battery to maximum,which can reach to6.94%,compared with other structures..