[en] In this study, we propose a straightforward method for x determination in sub-stoichiometric
nickel oxide (Ni1−xO) films prepared by ultrasonic spray pyrolysis on fluor-tin oxide (FTO)
substrates by varying the post-deposition thermal treatment. The Ni3+ concentration, the flat
band potential (Φfb) and the open circuit potential (Voc) were determined by electrochemical
impedance analysis in aqueous media and correlated to the transmission of Ni1−xO films.
An x-ray photoelectron spectroscopy study was also performed to quantify the amount of
Ni3+ in the films and compare it with the one determined by electrochemical analysis. The
electrochromic behavior of the Ni1−xO films in non-aqueous electrolyte was investigated as
well.
With increasing Ni3+ concentration the films became more brownish and more conductive,
both Voc and Φfb values increased. Calibration curves of transmission at 550 nm or open
circuit potential versus carrier concentration were plotted and allowed the prediction of x in an
unknown Ni1−xO sample. The Ni1−xO films characterized by the highest Ni3+ concentration
have a darker colored state but lower transmission modulation, due to their reduced specific
surface and increased crystallinity.
Disciplines :
Physics
Author, co-author :
Manceriu, Laura ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Colson, Pierre ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Maho, Anthony ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Eppe, Gauthier ; Université de Liège > Département de chimie (sciences) > Chimie analytique inorganique
Nguyen, Ngoc Duy ; Université de Liège > Département de physique > Physique des solides, interfaces et nanostructures
Labrugere, Christine; CNRS, Université de Bordeaux, PLACAMAT UMS 3626, F-33600 Pessac, France
Rougier, Aline; CNRS, Université de Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France
Cloots, Rudi ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Henrist, Catherine ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Language :
English
Title :
Straightforward prediction of the Ni1−xO layers stoichiometry by using optical and electrochemical measurements
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