Sandia National Laboratory researchers have developed a tiny silicon-based device that can harness what was previously called waste heat and turn it into DC power. The rectenna, short for rectifying antenna, is made of common aluminum, silicon and silicon dioxide using standard processes from the integrated circuit industry. Converting electrical power to heat is easy. […]

The U.S. is estimated to lose more than half of the energy it generates – mostly because it escapes as waste heat. Scientists are now developing a new type of system to efficiently capture some of that lost heat. They have designed a surface that enhances low frequency thermal radiation, which is easier than higher […]