Optoelectrochemical Characterization of Electrochromic Devices with Starch Based Solid Electrolytes

This paper describes the manufacturing and spectroelectrochemical characterization of all solid electrochromic devices (ECD). Both electrochromic (WO3) and storage ion (CeO2-TiO2) thin films were obtained by sol-gel method and deposited by dip-coating technique. The electrolytes were obtained by plasticization of starch with glycerol and addition of LiClO4 salt. The spectroelectrochemical measurements were performed with the complete devices as a function of the applied potential. The obtained results revealed that the color/bleaching process was reversible and the inserted/extracted charge was about 4.6 mC/cm2 for the applied potential of −2.0 V and increased up to 5.3 mC/cm2 for −2.3 V. This value was stable up to −2.5 V applied. The transmittance change at 630 nm was about 30% for 2.3 V applied and the optical density was about 0.25. The memory tests showed that the colored device bleached completely in open circuit in about 500 min. All the obtained results show that the presented devices are very good candidates to be tested as smart windows for architectural applications.

[1]  F. Conceição,et al.  PEDOT-AuNPs-based impedimetric immunosensor for the detection of SARS-CoV-2 antibodies , 2021, Electrochimica Acta.

[2]  A. Maldonado,et al.  Physical properties of ZnO:F obtained from a fresh and aged solution of zinc acetate and zinc acetylacetonate , 2006 .

[3]  D. Dragunski,et al.  Electrochromic Devices with Solid Electrolytes based on Natural Polymers , 2004 .

[4]  Donglan L. Sun,et al.  Influence of water on the electrochemical properties of (CeO2)x(TiO2)1−x and WO3 sol–gel coatings and electrochromic devices , 2003 .

[5]  Agnieszka Pawlicka,et al.  Solid polymeric electrolytes obtained from modified natural polymers , 2003, Saratov Fall Meeting.

[6]  Sabine Heusing,et al.  Influence of water on the electrochemical properties of CeO2TiO2 sol-gel coatings and electrochromic devices , 2002, SPIE Optics + Photonics.

[7]  A. Gandini,et al.  Cellulose derivatives as solid electrolyte matrixes , 2001 .

[8]  A. Gandini,et al.  Nuclear magnetic resonance and conductivity study of HEC:polyether-based polymer electrolytes , 2001 .

[9]  A. Gandini,et al.  DSC and solid state NMR characterization of hydroxyethylcellulose/polyether films , 2000 .

[10]  Nada A. O'Brien,et al.  Electrochromic coatings–applications and manufacturing issues , 1999 .

[11]  G. Casalbore-Miceli,et al.  All polymeric solid state electrochromic devices , 1999 .

[12]  C. E. Tracy,et al.  Accelerated Durability Testing of Electrochromic Windows , 1998 .

[13]  C. Lampert,et al.  Electrochromic characterization of sol-gel deposited coatings , 1998 .

[14]  H. Schmidt,et al.  Development of electrochromic cells by the sol-gel process , 1998 .

[15]  P. Judeinstein,et al.  All Sol-Gel Electrochromic Devices with Li+ Ionic Conductor, WO3 Electrochromic Films and SnO2 Counter-Electrode Films , 1998 .

[16]  Herbert Krug,et al.  Development of electrochromic smart windows by sol-gel techniques , 1997, Optics & Photonics.

[17]  Gavin Edmund Tulloch,et al.  Operation of electrochromic devices prepared by sol-gel methods , 1997, Optics & Photonics.

[18]  H. Schmidt,et al.  All sol—gel electrochromic system for plate glass , 1997 .

[19]  Robert B. Sargent,et al.  Large area electrochromics for architectural applications , 1997 .

[20]  R. Zoppi.  Solid electrolytes based on poly(amide 6-b-ethylene oxide) , 1996 .

[21]  Edward J. A. Pope,et al.  Sol-Gel Science and Technology , 1995 .

[22]  Prem N. Gupta,et al.  Polymer based solid state electrochromic display device using PVA complex electrolytes , 1995 .

[23]  Marcelo A. Macedo,et al.  Sol-gel coatings for electrochromic devices , 1992, Optics & Photonics.

[24]  D. Dragunski,et al.  Electrochromic Devices with Starch Based Solid Polymeric Electrolytes , 2002 .

[25]  A. Pawlicka,et al.  Preparation and Characterization of Starch Grafted with Toluene Poly(propylene oxide) Diisocyanate , 2001 .

[26]  H. Krug,et al.  Characterization of Electrochromic WO3-Layers Prepared by Sol-Gel Nanotechnology , 1998 .

[27]  D. Rosseinsky,et al.  Electrochromism : fundamentals and applications , 1995 .