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Boosting gas mileage by turning engine heat into electricity
by Staff Writers
Washington DC (SPX) Jul 27, 2015


File image.

Automakers are looking for ways to improve their fleets' average fuel efficiency, and scientists may have a new way to help them.

In a report in the journal ACS Applied Materials and Interfaces, one team reports the development of a material that could convert engine heat that's otherwise wasted into electrical energy to help keep a car running - and reduce the need for fuels.

It could also have applications in aerospace, manufacturing and other sectors.

In 2012, the Obama administration announced fuel-efficiency standards that would require U.S. vehicles to average 54.5 miles per gallon by 2025.

Improving gas mileage could help reduce greenhouse gas emissions and global dependence on fossil fuels. One approach scientists are exploring to help address these issues involves capturing waste heat from engines and other power systems and turning it into electricity.

Many compounds can do this but are heavy, costly, toxic or only operate at high temperatures. Ian A. Kinloch, Robert Freer and colleagues sought new alternatives.

The researchers started with a material called strontium titanium dioxide and added a small amount of graphene, a stable material with excellent conductive properties.

The resulting composite was able to capture and convert heat into electric current efficiently over a broad temperature range.


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