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Issue 6, 2017
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Enabling efficient heat-to-electricity generation at the mesoscale

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We present a technology that efficiently harnesses the energy content of hydrocarbon fuels in a volume that is only a fraction of a cubic inch. A propane-fueled microcombustor heats a photonic crystal emitter to incandescence and the resulting spectrally-confined thermal radiation drives low-bandgap PV cells to generate electricity. We overcome the technical challenges that are currently limiting thermophotovoltaics in the following ways: we develop new fabrication processes; we adopt high-temperature alloys to improve the thermo-mechanical stability; we adopt commercial polycrystalline tantalum to fabricate large-area photonic crystals; and finally, we develop a passivation coating for improved thermo-chemical stability. We demonstrate unprecedented heat-to-electricity efficiencies exceeding 4%, greater than the 2–3% efficiencies that were previously thought to be the practical limit, and we predict that over 12% efficiency is achievable with only engineering optimization. For reference, a 1.5% efficiency corresponds to the energy density of lithium ion batteries. This work opens new opportunities to free portable electronics, robots, and small drones from the constraints of bulky power sources.

Graphical abstract: Enabling efficient heat-to-electricity generation at the mesoscale

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The article was received on 07 Feb 2017, accepted on 09 May 2017 and first published on 23 May 2017

Article type: Communication
DOI: 10.1039/C7EE00366H
Energy Environ. Sci., 2017,10, 1367-1371

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    Enabling efficient heat-to-electricity generation at the mesoscale

    W. R. Chan, V. Stelmakh, M. Ghebrebrhan, M. Soljačić, J. D. Joannopoulos and I. Čelanović, Energy Environ. Sci., 2017, 10, 1367
    DOI: 10.1039/C7EE00366H

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