Potentiostatic Reversible Photoelectrochromism: An Effect Appearing in Nanoporous TiO2/Ni(OH)2 Thin Films

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Title: Potentiostatic Reversible Photoelectrochromism: An Effect Appearing in Nanoporous TiO2/Ni(OH)2 Thin Films
Authors: Cibrev, Dejan | Jankulovska, Milena | Lana-Villarreal, Teresa | Gómez, Roberto
Research Group/s: Grupo de Fotoquímica y Electroquímica de Semiconductores (GFES)
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Electrochromism | Photochromism | Titanium dioxide | Nickel hydroxide | Nanoparticle
Knowledge Area: Química Física
Issue Date: 13-Jun-2014
Publisher: American Chemical Society
Citation: ACS Applied Materials & Interfaces. 2014, 6(13): 10304-10312. doi:10.1021/am5017396
Abstract: In the field of energy saving, finding composite materials with the ability of coloring upon both illumination and change of the applied electrode potential keeps on being an important goal. In this context, chemical bath deposition of Ni(OH)2 into nanoporous TiO2 thin films supported on conducting glass leads to electrodes showing both conventional electrochromic behavior (from colorless to dark brown and vice versa) together with photochromism at constant applied potential. The latter phenomenon, reported here for the first time, is characterized by fast and reversible coloration upon UV illumination. The bleaching kinetics shows first order behavior with respect to the NiIII centers in the film, and an order 1.2 with respect to electrons in the TiO2 film. From a more applied point of view, this study opens up the possibility of having two-mode smart windows showing not only conventional electrochromism but also reversible darkening upon illumination.
Sponsor: This work was financially supported by the Spanish Ministry of Economy and Competitiveness (MINECO) through project MAT2012-37676 (FONDOS FEDER). M.J. and D.C. also thank the Spanish MINECO for the award of FPI grants.
URI: http://hdl.handle.net/10045/46088
ISSN: 1944-8244 (Print) | 1944-8252 (Online)
DOI: 10.1021/am5017396
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 American Chemical Society
Peer Review: si
Publisher version: http://dx.doi.org/10.1021/am5017396
Appears in Collections:INV - GFES - Artículos de Revistas

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