Ambient air's water molecules can be harvested to generate clean electricity at a nanoscale level.
, engineers at the University of Massachusetts Amherst have demonstrated a novel “air generator” film that relies on microscopic holes smaller than 100 nanometers across—less than a thousandth the width of a single human hair. The holes’ incredibly small diameters rely on what’s known as a “mean free path,” which is the distance a single molecule can travel before colliding with another molecule of the same substance.
It’s the same physics at play in storm clouds’ lightning discharges. Although the UMass Amherst team’s product generates a miniscule fraction of a lightning bolt’s estimated, its several hundred millivolts of sustained energy is incredibly promising for scalability and everyday usage. This is particularly evident when considering that air humidity can diffuse in three-dimensional space.
“Imagine a future world in which clean electricity is available anywhere you go,”Jun Yao, an assistant professor of electrical and computer engineering and the paper’s senior author,
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