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Stories Stories Technology A new way to harness waste heat: Electrochemical approach has potential to efficiently turn low-grade heat to electricity

A new way to harness waste heat: Electrochemical approach has potential to efficiently turn low-grade heat to electricity

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Written by melody     June 14, 2014    
 
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Vast amounts of excess heat are generated by industrial processes and by electric power plants; researchers around the world have spent decades seeking ways to harness some of this wasted energy. Most such efforts have focused on thermoelectric devices, solid-state materials that can produce electricity from a temperature gradient, but the efficiency of such devices is limited by the availability of materials.

Now researchers at MIT and Stanford University have found a new alternative for low-temperature waste-heat conversion into electricity -- that is, in cases where temperature differences are less than 100 degrees Celsius.

Electrochemical approach has potential

The new approach, based on a phenomenon called the thermogalvanic effect, is described in a paper published in the journal Nature Communications by postdoc Yuan Yang and professor Gang Chen at MIT, postdoc Seok Woo Lee and professor Yi Cui at Stanford, and three others.

Since the voltage of rechargeable batteries depends on temperature, the new system combines the charging-discharging cycles of these batteries with heating and cooling, so that the discharge voltage is higher than charge voltage. The system can efficiently harness even relatively small temperature differences, such as a 50 degrees Celsius difference.

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Massachusetts Institute of Technology
77 Massachusetts Ave
Cambridge, MA 02139
United States

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Massachusetts Institute of Technology
Contributor's Comment
Electrochemistry is a branch of chemistry that studies chemical reactions which take place in a solution at the interface of an electron conductor (the electrode: a metal or a semiconductor) and an ionic conductor (the electrolyte). These reactions involve electron transfer between the electrode and the electrolyte or species in solution. Thus electrochemistry deals with interactions between electrical energy and chemical change and vice versa.
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