Self-Powered Wearable Electronics Based on Moisture Enabled Electricity Generation Academic Article uri icon

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  • Most state-of-the-art electronic wearable sensors are powered by batteries that require regular charging and eventual replacement, which would cause environmental issues and complex management problems. Here, a device concept is reported that can break this paradigm in ambient moisture monitoring-a new class of simple sensors themselves can generate moisture-dependent voltage that can be used to determine the ambient humidity level directly. It is demonstrated that a moisture-driven electrical generator, based on the diffusive flow of water in titanium dioxide (TiO2 ) nanowire networks, can yield an output power density of up to 4 µW cm-2 when exposed to a highly moist environment. This performance is two orders of magnitude better than that reported for carbon-black generators. The output voltage is strongly dependent on humidity of ambient environment. As a big breakthrough, this new type of device is successfully used as self-powered wearable human-breathing monitors and touch pads, which is not achievable by any existing moisture-induced-electricity technology. The availability of high-output self-powered electrical generators will facilitate the design and application of a wide range of new innovative flexible electronic devices.


  • Shen, Daozhi
  • Xiao, Ming
  • Zou, Guisheng
  • Liu, Lei
  • Duley, Walter W
  • Zhou, Norman

publication date

  • May 2018