Anthropocene Magazine · Climate & nature

Wallpaper Generates Electricity from Indoor Humidity

Researchers have developed a novel wallpaper capable of converting indoor humidity into electrical power, potentially offering a sustainable energy source and a method for humidity control.

The new wall-mounted panel, detailed in Advanced Energy Materials, aims to power small sensors and electronic devices, reducing reliance on disposable batteries. Unlike previous devices designed for outdoor humidity, which face inconsistent levels due to weather, this system leverages the stable indoor humidity (typically 30-60%).

The wallpaper utilizes a paper-based moist-electric generator (MEG) that absorbs moisture at its edges, transports it to the center, and then allows it to evaporate. This unidirectional moisture transport generates an electric current.

Each 2x2 cm paper square captures moisture using glycerol at the edges. A polymer structure draws water inward, while a wax-treated central area repels liquid but allows vapor to escape, facilitating the process.

Currently, the power output is modest. A 35-unit array powered a humidity sensor for 15 minutes. A larger 1,596-unit array could power a wireless keyboard with a charge-storing device and reduced indoor humidity from 38% to 32%.

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