DA ROCHA, Mathias; DUNN, Bruce; ROUGIER, Aline

doi:10.1016/j.solmat.2019.110114

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DA ROCHA, Mathias
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DUNN, Bruce
University of California [Los Angeles] [UCLA]

ROUGIER, Aline
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

Ce document a été publié dans

Solar Energy Materials and Solar Cells. 2019-10, vol. 201, p. 110114 (8 p.)

Elsevier

Résumé en anglais

This study compares the electrochromic performance of NiO thin films deposited by RF magnetron sputtering cycled in lithium, sodium and small cations free based electrolytes, namely 1:9 LiTFSI in EMITFSI, 1:9 NaTFSI in EMITFSI and EMITFSI respectively. Regardless of the electrolyte nature, NiO thin films show similar electrochromic properties associated with an optical switch from colorless to brownish upon oxidation correlated to a modulation of transmittance close to 40 % associated with a good electrochemical stability. Interestingly, depending on the electrolyte nature, the EC behavior is correlated with various CV shapes raising the question of the mechanism involved. In particular, the reversible coloration mechanism cannot be only described by a single insertion/extraction of lithium ions, as observed for tungsten oxide in lithium media. The rectangular shape of the CV curves of NiO thin films in neat electrolyte and the behavior of NiO with various scan rates suggest that the EC properties result from a combination of both faradaic and capacitive contributions, with redox reactions largely occurring at the surface. Integration of NiO thin films in a full device is illustrated in double sided PANI/white electrolyte-EMITFSI/NiO EC devices showing simultaneous progressive color changes from blue to green and white to brown, on PANI and NiO sides, respectively.< Réduire

Mots clés en anglais

Electrochromism

Nickel oxide

Mechanism

Capacitive

Device

DOI

http://dx.doi.org/10.1016/j.solmat.2019.110114

Project ANR

Advanced Materials by Design
Initiative d'excellence de l'Université de Bordeaux

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026