Electrochromic devices with Prussian blue and electrolytes based on natural and/or synthetic macromolecules

• Grant number: 12/14103-3
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: December 01, 2012
• End date: February 29, 2016
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Agnieszka Joanna Pawlicka Maule
• Grantee: Lucas Marinho Nóbrega de Assis
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

This project proposes the preparation and characterization of electrochromic devices with Prussian blue as electrochromic material and natural and synthetic macromolecules such as polymer electrolytes. Regarding the development of electrochromic devices the project consists in the deposition of Prussian blue films by two methods, self-assembly (layer-by-layer; LBL) and electrodeposition. The assembly of the window is made by joining the layers with the layers of electrochromic counter electrode consisting of CeO 2-TiO 2, having the electrolyte membrane in the form of ionic conductive base of natural macromolecules, such as agar, pectin, gelatin and DNA developed in our laboratories. The analysis and characterization of electrochromic windows are made by measuring electrochemical and spectroscopic checking the index contrast between transparent and colored state, load values inserted / extracted, window operating potential, as well as the number of time cycles and staining / discoloration and long memory device in an open circuit. As expansion of the initial project proposes to study the parameters LAB, CIELAB 1976 system by measuring the reflectance on windows with different compositions in order to correlate the composition with the parameters obtained. For best results, and obtaining the real devices that might have practical application intends to also consider the load values inserted / extracted, windows operating potential, as well as the number of cycles, time and time change in color of the memory open-circuit devices. Following the practical applications is also investigated the possibility of deposition on transparent flexible substrate (PET / ITO) and rigid substrate and reflective (stainless steel) by using electrodes with complementary colors to the primary electrochromic layer, such as WO3 with the PEDOT for higher levels of contrast. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ASSIS, L. M. N.; LEONES, R.; KANICKI, J.; PAWLICKA, A.; SILVA, M. M.. Prussian blue for electrochromic devices. Journal of Electroanalytical Chemistry, v. 777, p. 33-39, SEP 15 2016. (12/14103-3)

ASSIS, L. M. N.; LEONES, R.; KANICKI, J.; PAWLICKA, A.; SILVA, M. M.. Prussian blue for electrochromic devices. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v. 777, p. 7-pg., 2016-09-15. (12/14103-3)

TIHAN, GRATIELA TEODORA; MINDROIU, MIHAELA; RAU, ILEANA; NOBREGA DE ASSIS, LUCAS MARINHO; PAWLICKA, AGNIESZKA; ZGARIAN, ROXANA GABRIELA. The electrochromic device performance with DNA based electrolyte. Materials Chemistry and Physics, v. 241, FEB 1 2020. (12/14103-3)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

ASSIS, Lucas Marinho Nóbrega de. Electrochromic devices with Prussian blue and solid polymer electrolytes. 2016. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Química de São Carlos (IQSC/BT) São Carlos.