Sponges derived from luffa plants could act as tiny power sources for small devices, say researchers - but they may not supply enough energy to be practical
Loofah sponges – the porous husks left after drying the fruit of luffa plants – can create enough electricity when squeezed to power LEDs. Researchers say their findings could lead to green and cheap power supplies for small devices, but it is unclear if the sponges can create enough energy to be of practical use.
Many electrically insulating materials can create an electric charge when deformed – a phenomenon called piezoelectricity – but the size of that charge is usually vanishingly small. Jianxiang Wang at Peking University in Beijing and his colleagues investigated whether the loofah material often used in the kitchen or shower could do better.
When a 6-millimetre-thick section of this sponge was squashed by hand, it generated up to 8 nanoamps of electricity. When this was placed into an electrical circuit with capacitors that could store the power of many squashes, it was able to briefly power six LED lights.
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