Motion-driven electrochromic reactions for self-powered smart window system

Min Hsin Yeh, Long Lin, Po Kang Yang, Zhong Lin Wang

Research output: Contribution to journalArticlepeer-review

157 Scopus citations


The self-powered system is a promising concept for wireless networks due to its independent and sustainable operations without an external power source. To realize this idea, the triboelectric nanogenerator (TENG) was recently invented, which can effectively convert ambient mechanical energy into electricity to power up portable electronics. In this work, a self-powered smart window system was realized through integrating an electrochromic device (ECD) with a transparent TENG driven by blowing wind and raindrops. Driven by the sustainable output of the TENG, the optical properties, especially the transmittance of the ECD, display reversible variations due to electrochemical redox reactions. The maximum transmittance change at 695 nm can be reached up to 32.4%, which is comparable to that operated by a conventional electrochemical potentiostat (32.6%). This research is a substantial advancement toward the practical application of nanogenerators and self-powered systems.

Original languageEnglish
Pages (from-to)4757-4765
Number of pages9
JournalACS Nano
Issue number5
StatePublished - 26 May 2015


  • electrochromic devices
  • energy harvesting
  • self-powered systems
  • smart windows
  • triboelectric nanogenerators


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