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Trace H 2 O 2 ‐Assisted High‐Capacity Tungsten Oxide Electrochromic Batteries with Ultrafast Charging in Seconds
Author(s) -
Zhao Jinxiong,
Tian Yuyu,
Wang Zhen,
Cong Shan,
Zhou Di,
Zhang Qingzhu,
Yang Mei,
Zhang Weikun,
Geng Fengxia,
Zhao Zhigang
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201602657
Subject(s) - electrochromism , tungsten , materials science , tungsten oxide , oxide , valence (chemistry) , nanotechnology , battery (electricity) , energy storage , electrochromic devices , optoelectronics , computer science , chemistry , electrode , physics , metallurgy , power (physics) , organic chemistry , quantum mechanics
A recent technological trend in the field of electrochemical energy storage is to integrate energy storage and electrochromism functions in one smart device, which can establish efficient user–device interactions based on a friendly human‐readable output. This type of newly born energy storage technology has drawn tremendous attention. However, there is still plenty of room for technological and material innovation, which would allow advancement of the research field. A prototype Al‐tungsten oxide electrochromic battery with interactive color‐changing behavior is reported. With the assistance of trace amount of H 2 O 2 , the battery exhibits a specific capacity almost seven times that for the reported electrochromic batteries, up to 429 mAh g −1 . Fast decoloration of the reduced tungsten oxide affords a very quick charging time of only eight seconds, which possibly comes from an intricate combination of structure and valence state changes of tungsten oxide. This unique combination of features may further advance the development of smart energy storage devices with suitability for user–device interactions.