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Structural and chemical-physical characterization of new Deep Eutectic Solvents (DESs) interfaced with graphene based materials for advanced applications in electrochemistry and photoelectrochemistry

Grant number: 19/22273-5
Support type:Scholarships abroad - Research
Effective date (Start): November 01, 2020
Effective date (End): December 31, 2020
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Jose Mauricio Rosolen
Grantee:Jose Mauricio Rosolen
Host: Danilo Dini
Home Institution: Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
Local de pesquisa : Università degli Studi di Roma La Sapienza, Italy  

Abstract

The present work proposal concerns the analysis of the chemical-physical properties as well as the determination of the structural features of deep eutectic solvents (DESs), i.e. systems with an intrinsically glassy nature, upon variation of the nature of a metal (M) when M, in the generic cationic form Mn+, is present either in the starting formulation of the DES, or as an extraneous species incorporated by DES after extraction from compounds containing metal cations. The classes of compounds which will be considered as metal cation sources for consideration of extraction with DESs are oxides, sulphides and the rest of the calchogenides, halogens, nitrides, phosphides and arsenides. In particular, the present project proposal intends to determine the electrical conductivity and the redox properties of M-DESs as function of the temperature with the purpose of evaluating their utilization as viscous, self-standing electrolytes in photoelectrochemical and electrochromic cells when the electrodes are modified with graphene-based layers having opportune charge transport and optical properties. The project aiming future international cooperation such that the short visit will create the conditions to start the cooperation. During the visit some tasks of project will be carried out, while others during the cooperation after return in Brazil. The tasks that will be performed during the visit involve synthesis of M-DESs and evaluation of the electrochemical stability of M-DESs with amperometric techniques using stimuli for both a stationary electric potential and a temporally variable electric potential. Determination of redox properties of M-DES containing redox couples of interest in photoelectrochemistry. The preparation of M-DESs containing redox buses is performed using the one-pot procedure. Electrochemical characterization of the interface created by unmodified semiconductor electrodes and M-DES electrolytes for verification of contact stability. Semiconductor electrodes are n and p type metal oxides and sulfides that would eventually be modified with graphene or its derivatives. Preparation of M-DESs containing redox shuttles in thin film configuration and assembly of DSCs and electrochromic windows with the choice of semiconductor electrodes.