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Type: Artigo de periódico
Title: All-polymeric Electrochromic And Photoelectrochemical Devices: New Advances
Author: De Paoli M.-A.
Nogueira A.F
Machado D.A
Longo C.
Abstract: Flexible and solid-state electrochromic and photoelectrochemical devices were assembled using PET-ITO flexible electrodes as substrate to the electroactive layers and a polymer electrolyte based on poly(epichlorohydrin-co-ethylene oxide). Large area all-polymeric electrochromic device (20 cm2) consisted of a sandwich-type cell of electrodes modified with poly(o-methoxy aniline) and poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) films. The device exhibited a very high optical contrast (transparent to dark blue), with ΔT%=75% at λ=640 nm, however, it partially loses optical contrast after 100 redox cycles, resulting in ΔT%=42%. The solid-state flexible photoelectrochemical solar cell consisted of a dye-sensitized porous TiO2 electrode and a Pt counter-electrode assembled with the polymer electrolyte containing the I3-/I- redox couple. This cell exhibited an open circuit potential of 0.83 V, a short-circuit photocurrent of 0.19 mA cm-2 and an efficiency of 0.09% (100 mW cm-2). The low efficiency for energy conversion, in comparison to cells with liquid electrolytes, was attributed to the polymer electrolyte and the reduced mobility of I3- in such medium as well as to the poor electronic contact between the TiO2 particles in the porous film. © 2001 Elsevier Science Ltd. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0013-4686(01)00684-3
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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