6533b85efe1ef96bd12bfbae
RESEARCH PRODUCT
Digital video-electrochemistry (DVEC) to assess electrochromic materials in the frequency domain: RGB colorimetry impedance spectroscopy
Esteban GuillénJosé Juan García-jareñoMaría Ferrer-rosellóJerónimo AgrisuelasFrancisco Vicentesubject
Materials sciencebusiness.product_categorybusiness.industryGeneral Chemical Engineering02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologyElectrochromic devices01 natural sciences0104 chemical sciencesDielectric spectroscopySwitching timeDigital imageElectrochromismFrequency domainElectrochemistryRGB color modelOptoelectronics0210 nano-technologybusinessDigital cameradescription
Abstract This work is the first one allowing the characterization of electrochromic devices simultaneously at various parts on their surface and different rates of color change. We describe a new proficient and affordable methodology for reporting electrochromic parameters such as coloration efficiency, optical contrast, and switching time based on the use of digital video-electrochemistry (DVEC) in the ac regime, namely RGB colorimetry impedance spectroscopy. Simultaneously with the electrochemical impedance spectroscopy, the RGB color changes of an electrochromic electrode were recorded by a CCD digital camera at 120 digital images per second. In such conditions, RGB electrochromic changes extracted from the digital images can be easily analyzed until 10 Hz using a potential perturbation amplitude of 50 mV rms. Electrochromic devices based on poly(3,4-ethylenedioxythiophene) films deposited on ITO electrodes were tested as examples. This new methodology does not require expensive instrumentation and it proves easy to be implemented in most of the specialized laboratories around the world.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-01-01 | Electrochimica Acta |