>
FDA Chief Says No Solid Evidence Supporting Hepatitis B Vaccine At Birth
Evergreen, Colorado: Another Killing Zone in America
Trump Cryptically Writes "Here We Go!" In Reaction To Russia-Poland Drone Incident, Oil Sp
Qatar Says It Reserves Right To Retaliate Against 'Barbaric' Netanyahu
Tesla Megapack Keynote LIVE - TESLA is Making Transformers !!
Methylene chloride (CH2Cl?) and acetone (C?H?O) create a powerful paint remover...
Engineer Builds His Own X-Ray After Hospital Charges Him $69K
Researchers create 2D nanomaterials with up to nine metals for extreme conditions
The Evolution of Electric Motors: From Bulky to Lightweight, Efficient Powerhouses
3D-Printing 'Glue Gun' Can Repair Bone Fractures During Surgery Filling-in the Gaps Around..
Kevlar-like EV battery material dissolves after use to recycle itself
Laser connects plane and satellite in breakthrough air-to-space link
Lucid Motors' World-Leading Electric Powertrain Breakdown with Emad Dlala and Eric Bach
Murder, UFOs & Antigravity Tech -- What's Really Happening at Huntsville, Alabama's Space Po
About 750 million people in the world do not have access to electricity at night. Solar cells provide power during the day, but saving energy for later use requires substantial battery storage.
Researchers from Stanford University constructed a photovoltaic cell that harvests energy from the environment during the day and night, avoiding the need for batteries altogether. The device makes use of the heat leaking from Earth back into space—energy that is on the same order of magnitude as incoming solar radiation.
"You want the thermoelectric to have very good contact with both the cold side, which is the solar cell, and the hot side, which is the ambient environment," said author Sid Assawaworrarit. "If you don't have that, you're not going to get much power out of it."
At night, solar cells radiate and lose heat to the sky, reaching temperatures a few degrees below the ambient air. The device under development uses a thermoelectric module to generate voltage and current from the temperature gradient between the cell and the air. This process depends on the thermal design of the system, which includes a hot side and a cold side.