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A step closer to reality – Equipment that Transform Heat into Electricity

By Parul Gupta December 24, 2016

The scientists who introduced a revolutionary use of a quantum mechanical effect to transform heat into electricity have identified out how to make their approach work in a sort that is more suitable to the industry.
 
Engineers from the Ohio State University illustrate how they utilized magnetism on a composite of platinum and nickel to amplify the output of voltage 10 times or more, not in a sleek film, as they had performed previously, but in a thicker piece of substance that more closely resembles elements for future electrical devices.
 
Numerous mechanical and electrical devices, like car engines, generate heat as a by-product of their normal operation. It is known as ‘waste heat’ and its existence is needed by the basic laws of thermodynamics, says the co-author of study Stephen Boona. But an expanding area of research known as solid-state thermoelectrics intends to capture that waste heat within specially crafted substances to release power and enhance overall energy output.
 
Devices that convert heat into electricity
 
“Over half of the energy we employ is wasted and enters the atmosphere as heat,” says Boona, a postdoctoral scientist at the Ohio State. “Solid-state thermoelectrics can aid us recover some volume of energy. Such devices possess no moving parts, do not wear out, are strong and need no maintenance. Unfortunately, till date, they are also too costly and not quite effective enough to offer extensive use. We are working to alter that.”
 
In 2012, the similar Ohio State Research Group, headed by Joseph Heremans, illustrated that magnetic fields could augment a quantum mechanical effect known as Seedbeck effect, and in turn enhances the voltage output of sleek films prepared from exotic nano-structured substances from a couple of microvolts to a few millivolts.
 
In the latest study, they have augmented the output for a composite of two very popular metals, nickel with a sprinkling of platinum, from a couple of nanovolts to tens or hundreds of nanovolts – a smaller voltage, but in a much simpler equipment that needs no fabrication and can be extensively scaled for industry.
 
Heremans, a lecturer of aerospace and mechanical engineering and the Ohio Eminent Scholar in Nanotechnology, says that too some extent, utilizing the same technique in thicker elements of substances needed that he and his group rethink the equations that rule thermodynamics and thermoelectricity, which were introduced before researchers knew about quantum mechnaics. And while quantum mechanics often relates photons – particles and waves of light – Hereman’s study concerns magnons – particles and waves of magnetism.
 
“Normally, classical thermodynamics covers steam engines that utilize steam as a working fluid, or car engines or jet engines that use air as the functional element. Thermoelectrics utilize electrons as the working fluid, and such work, we are using quanta of magnetization, or magnons,” says Heremans.
 
While the composite is not still part of a real-world device, Heremans is confident that the proof-of-principle established by this study would inspire further research that may result in applications for popular waste heat generators, comprising jet and car engines.

Filed Under: News

 

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