“Evapolectrics”: Harvesting Energy from Air
Scientists at the Chinese University of Hong Kong and the National University of Singapore have pioneered a device that extracts electricity directly from moisture in the air via evaporation—without relying on mechanical components. This "evapolectric" technique delivers at least double the output of prior hydrovoltaic methods. Initially able to power tiny gadgets like LCD screens, improvements may soon enable its use in wearable tech, harvesting energy even from human sweat.
Here's a more detailed explanation:
How it works:Evapolectrics utilize the heat released during evaporation (evaporation enthalpy) to create a temperature difference across a thermoelectric generator.
Key components:The technology involves using materials like porous graphite coatings and optimizing factors like wind speed and wet-bulb depression to maximize the temperature gradient.
Advantages: Evapolectrics offer a continuous power source, unlike intermittent sources like solar or wind, and can be scaled up for various applications.
Potential applications:The technology has the potential to power small devices, even those worn on the body, and could be scaled up for larger systems in the future.
Comparison to other technologies: Evapolectrics can potentially produce more power than other ambient energy harvesting technologies like triboelectric or hydrovoltaic devices.
Research and development:Scientists are actively researching and developing evapolectrics, with ongoing efforts to improve material properties, system design, and scalability for practical applications.
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