Estudo do líquido iônico fenilsuccínico por meio da caracterização dielétrica por impedância para aplicação em células fotovoltaicas

Abstract

The present study consists on the investigation of ionic liquids (ILs), such as 4-(2-(3-methylimidazolium-1-yl)ethoxy)-4-oxo-2-phenylbutanoate acid bromide (IL Phenylsuccinic-MC3), as an alternative to replace volatile solvents in Dye-Sensitized Solar Cells (DSSC). This is of great relevance due to the search for renewable and sustainable energy sources. ILs with carboxylic groups, based on the imidazolium cation, were selected as candidates for this application. The research process included the synthesis of these specific ILs, followed by a detailed analysis of their electrical properties. The electrical conductivity of these ILs was investigated using impedance spectroscopy, allowing the assessment of these materials' ability to conduct electric charges a fundamental characteristic for the performance of photovoltaic cells. For the real part of the spectrum at f > 102Hz, a characteristic plateau and an increase in the R value for f < 102Hz Hz were observed at different temperatures for the pure liquid. For the imaginary part of the pure liquid between 10-2Hz > f > 103Hz, the x values decrease with the same slope, indicating a similar behavior to the phenylsuccinic liquid with a volatile solvent. Furthermore, the viscosity analysis of ILs makes use of rheology, a technique that studies the behavior of materials under stress. Viscosity is a critical property as it directly affects the handling and practical application of these ILs in solar cells. This study addresses not only the search for more sustainable alternatives in photovoltaic cells but also contributes to advancing knowledge about ILs and their fundamental characteristics. The results may have significant implications for the development of more efficient and environmentally friendly technologies for solar energy generation.