Smart wallpaper converts humidity to electricity for low-power devices

Binghamton University researchers created wallpaper that generates small amounts of electricity from indoor humidity, targeting low-power sensors rather than home energy.

Binghamton University researchers developed smart wallpaper that converts indoor humidity to electricity using paper-based moisture flow. Each 2 x 2-cm tile generates 0.34 volts at 80% humidity, with 10 sequential tiles producing approximately 2.9 volts and 1,596 tiles delivering 3.5 volts at 38% humidity. The technology uses Whatman 3 MM paper with three functional zones: glycerol at edges for water vapor capture, polyvinylpyrrolidone (PVP) in the center for water retention, and wax treatment for vapor release. It can reduce humidity from 75% to 50% in 4 minutes using 28 tiles and power a humidity sensor for 15 minutes with a 35-tile array. Published in *Advanced Energy Materials*, the technology operates as a humidity buffer, raising dry air from 15% to 20% in 16 minutes after saturation. Its realistic application target is environmental sensors and internet-of-things devices—not grid power or solar alternatives.

The mechanism relies on paper’s ability to absorb and release moisture through controlled humidity cycles, generating small electrical currents. This design enables mass production without cleanroom requirements, using printable manufacturing techniques. However, the output levels are insufficient for direct grid replacement, and the technology currently functions only as a humidity buffer for low-power electronics.

This advancement moves abundance for low-cost environmental monitoring and IoT applications where grid access is limited. By enabling self-powered sensors in resource-constrained settings, it reduces reliance on external power sources for humidity tracking. For now, it does not address home energy needs or grid-scale power generation.

What to watch: Durability testing, long-term operational stability, and scalability validation. Source details remain limited to lab-scale validation—real-world room performance is preliminary and unverified. The technology requires proof of concept for practical deployment beyond controlled environments.

Source: New Atlas