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A sprinkling of graphene may conjure a long-sought material into existence
ANY sufficiently advanced technology, as Arthur C. Clarke once observed, is indistinguishable from magic. And one that seems routinely to be ascribed magical properties is graphene. It has been proposed for the manufacture of transistors and light bulbs, as a replacement for bone and a way of delivering drugs, for storing power and for transmitting it, and for lubricating things and waterproofing them. Its latest suggested role, though, is to help turn heat directly into electricity.
The Seebeck effect, first seen in 1821 by a German physicist of that name, is a property of some materials whereby heating part of an object made of that material drives electrons from the hot part to the cold part, creating a current. Generating electricity from heat in this way will never substitute for creating it in a power station specially designed for the purpose but it might, some believe, permit the exploitation of heat that would otherwise go to waste—that produced by car engines, for example; or, indeed, by the power station itself.
The problem is that materials which exhibit a strong enough Seebeck effect to be potentially useful do so only in narrow temperature ranges. One promising candidate is strontium titanium oxide—but it exhibits the effect only when it is heated to between 700° and 750°C. However, two materials scientists, Robert Freer and Ian Kinloch, who work at Manchester University, in Britain, suspected they might be able to extend that range by adding graphene—which, not coincidentally, was discovered at Manchester in 2003. As they report in Applied Materials and Interfaces, they think they have succeeded.
Read more: Generating power from waste heat: Hot stuff
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The Latest on: Generating power from waste heat
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Thermoelectric materials have the unique ability to generate electricity from temperature differences and therefore could potentially be used to convert otherwise wasted heat (such as heat from hot ...
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Thermoelectric materials have the unique ability to generate electricity from temperature differences and therefore could potentially be used to convert otherwise wasted heat (such as heat from hot ...
- Applying pressure is way toward generating more electricity from waste heaton June 26, 2019 at 5:00 pm
The ability of a thermoelectric material to produce electricity from waste heat was improved more than twofold. The researchers applied pressure to the material to induce a Lifshitz phase transition ...
- Ancient effect harnessed to produce electricity from waste heaton June 13, 2019 at 1:42 pm
Zhong Lin Wang and colleagues at Georgia Tech explain that more than 50 percent of the energy generated in the U.S. each year goes to waste, much of it ... electric transmission lines. Heat can be ...
- Generating electrical power from waste heaton April 29, 2019 at 5:00 pm
The opposite, converting heat into electrical power, isn’t so easy. Researchers from Sandia National Laboratories have developed a tiny silicon-based device that can harness what was previously called ...
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