Abstract
Conversion of low-grade waste heat into electricity had been studied employing single thermocell or flowcells so far. Graphene coated copper electrodes based thermocells connected in series displayed relatively high efficiency of thermal energy harvesting. The maximum power output of 49.2W/m2 for normalized cross sectional electrode area is obtained at 60oC of inter electrode temperature difference. The relative carnot efficiency of 20.2% is obtained from the device. The importance of reducing the mass transfer and ion transfer resistance to improve the efficiency of the device is demonstrated. Degradation studies confirmed mild oxidation of copper foil due to corrosion caused by the electrolyte.
Highlights
Low grade waste heat, such as that produced via industrial or geothermal processes, in particular was a significant source of energy that could be harvested for the production of electricity
We report conversion of low-grade waste heat into electricity by thermocells connected in series based on cost effective graphene coated copper electrodes displaying relatively high efficiency of thermal energy harvesting
The maximum power output of 49.2 W/m2 and relative carnot efficiency of 20.2% is obtained at 60◦C of inter electrode temperature difference from the device
Summary
Low grade waste heat (i.e., at temperatures
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