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Highly stable electrochromic cells based on amorphous tungsten oxides prepared using a solution‐annealing process
Author(s) -
Nguyen Tuan Van,
Huynh Kim Anh,
Le Quyet Van,
Kim Hayeong,
Ahn Sang Hyun,
Kim Soo Young
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6354
Subject(s) - electrochromism , amorphous solid , materials science , annealing (glass) , tungsten , chemical engineering , electrochromic devices , calcination , oxide , nanotechnology , composite material , chemistry , metallurgy , organic chemistry , catalysis , electrode , engineering
Summary In this work, a facile sol–gel and annealing technique was employed to prepare amorphous electrochromic tungsten oxide thin films at a relatively low temperature. Specifically, ammonium metatungstate hydrate was blended in dimethylformamide and was used as the precursor for obtaining highly uniform and transparent amorphous WO x by simple spin‐coating and calcining in ambient air at 250°C for 2 hours. The film exhibits an unprecedented stability over 4000 operational cycles with a high coloration efficiency of 125 cm 2 C −1 and fast switching times of 5 seconds for the colored state and 2.5 seconds for the bleaching state. Therefore, the prepared amorphous tungsten oxide film is a prominent material for the next generation of electrochromic devices that can be used in smart windows and electronic display devices.