An electric power supply driven by water evaporating from a carbon nanomaterial has been unveiled by researchers in China. Their device is about 2.5 cm long and can create a voltage of about 1.5 V – on par with a standard AA battery. While the power supply only delivers a few hundred nanoamps, the team connected several devices together to run a liquid-crystal display. With further improvements, the researchers say, the device could be used to run sterilization equipment and to purify or desalinate water in warm regions of the world.
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